This document provides an overview of various construction materials used in civil engineering projects. It begins by discussing naturally available materials like stone, brick, lime, and timber. It then covers industrial materials like cement and metals. For each material, the document outlines the composition, requirements, types, properties and common uses. Stone is described in more detail, covering the different types of stone and their uses in hydraulic structures, retaining walls, and more. The document also provides a detailed breakdown of the production of bricks and their various classifications, as well as the properties and uses of lime, cement, and timber. It discusses the seasoning process for timber to reduce moisture content.
Information on the slides is found on the internet. Any incorrect information is not intended. All credit is given to the source of information, not to the author of this slide.
In presentation I have covered all the topics of building materials which are used in construction work of any building like stone,brick,sand,cement,etc.
Information on the slides is found on the internet. Any incorrect information is not intended. All credit is given to the source of information, not to the author of this slide.
In presentation I have covered all the topics of building materials which are used in construction work of any building like stone,brick,sand,cement,etc.
Concrete Construction: Batching of mixes; casting process, compaction and curing;
requirement of mix design and casting of test cubes – removing cubes from moulds and
curing for strength tests; bar-bending equipments and preparation of reinforcement for
R C C works
introduction
Classification Of Aggregates, Good Qualities of an Ideal Aggregate: ,Tests on Aggregate:- , Specıfıc gravıty of Aggregate. , Flakiness & Elongation Index , Fineness Modulus (f.m):
Geopolymers are new materials for fire- and heat-resistant coatings and adhesives, medicinal applications, high-temperature ceramics, new binders for fire-resistant fiber composites, toxic and radioactive waste encapsulation and new cements for concrete.
Gives information about various building materials, classification of buildings, types of loads, building components their functions and nominal dimensions.
STONE -As A Building Material.
Stones have been considered as one of the popular building material from the olden days due to their availability in abundance from the natural rocks. Building stones should possess enough strength and durability.
The stones which are suitable for the construction of the structures such as retaining walls, abutments, dams, barrages, roads etc are known as building stones.
Concrete Construction: Batching of mixes; casting process, compaction and curing;
requirement of mix design and casting of test cubes – removing cubes from moulds and
curing for strength tests; bar-bending equipments and preparation of reinforcement for
R C C works
introduction
Classification Of Aggregates, Good Qualities of an Ideal Aggregate: ,Tests on Aggregate:- , Specıfıc gravıty of Aggregate. , Flakiness & Elongation Index , Fineness Modulus (f.m):
Geopolymers are new materials for fire- and heat-resistant coatings and adhesives, medicinal applications, high-temperature ceramics, new binders for fire-resistant fiber composites, toxic and radioactive waste encapsulation and new cements for concrete.
Gives information about various building materials, classification of buildings, types of loads, building components their functions and nominal dimensions.
STONE -As A Building Material.
Stones have been considered as one of the popular building material from the olden days due to their availability in abundance from the natural rocks. Building stones should possess enough strength and durability.
The stones which are suitable for the construction of the structures such as retaining walls, abutments, dams, barrages, roads etc are known as building stones.
construction materials,properties of construction materials, stone, bricks, lime, cement,metal, timber,sand,aggregate,concrete,mortar, artificial or industrials materials
Water scarcity is the lack of fresh water resources to meet the standard water demand. There are two type of water scarcity. One is physical. The other is economic water scarcity.
Sachpazis:Terzaghi Bearing Capacity Estimation in simple terms with Calculati...Dr.Costas Sachpazis
Terzaghi's soil bearing capacity theory, developed by Karl Terzaghi, is a fundamental principle in geotechnical engineering used to determine the bearing capacity of shallow foundations. This theory provides a method to calculate the ultimate bearing capacity of soil, which is the maximum load per unit area that the soil can support without undergoing shear failure. The Calculation HTML Code included.
Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
Explore the innovative world of trenchless pipe repair with our comprehensive guide, "The Benefits and Techniques of Trenchless Pipe Repair." This document delves into the modern methods of repairing underground pipes without the need for extensive excavation, highlighting the numerous advantages and the latest techniques used in the industry.
Learn about the cost savings, reduced environmental impact, and minimal disruption associated with trenchless technology. Discover detailed explanations of popular techniques such as pipe bursting, cured-in-place pipe (CIPP) lining, and directional drilling. Understand how these methods can be applied to various types of infrastructure, from residential plumbing to large-scale municipal systems.
Ideal for homeowners, contractors, engineers, and anyone interested in modern plumbing solutions, this guide provides valuable insights into why trenchless pipe repair is becoming the preferred choice for pipe rehabilitation. Stay informed about the latest advancements and best practices in the field.
Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
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When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
Quality defects in TMT Bars, Possible causes and Potential Solutions.PrashantGoswami42
Maintaining high-quality standards in the production of TMT bars is crucial for ensuring structural integrity in construction. Addressing common defects through careful monitoring, standardized processes, and advanced technology can significantly improve the quality of TMT bars. Continuous training and adherence to quality control measures will also play a pivotal role in minimizing these defects.
Automobile Management System Project Report.pdfKamal Acharya
The proposed project is developed to manage the automobile in the automobile dealer company. The main module in this project is login, automobile management, customer management, sales, complaints and reports. The first module is the login. The automobile showroom owner should login to the project for usage. The username and password are verified and if it is correct, next form opens. If the username and password are not correct, it shows the error message.
When a customer search for a automobile, if the automobile is available, they will be taken to a page that shows the details of the automobile including automobile name, automobile ID, quantity, price etc. “Automobile Management System” is useful for maintaining automobiles, customers effectively and hence helps for establishing good relation between customer and automobile organization. It contains various customized modules for effectively maintaining automobiles and stock information accurately and safely.
When the automobile is sold to the customer, stock will be reduced automatically. When a new purchase is made, stock will be increased automatically. While selecting automobiles for sale, the proposed software will automatically check for total number of available stock of that particular item, if the total stock of that particular item is less than 5, software will notify the user to purchase the particular item.
Also when the user tries to sale items which are not in stock, the system will prompt the user that the stock is not enough. Customers of this system can search for a automobile; can purchase a automobile easily by selecting fast. On the other hand the stock of automobiles can be maintained perfectly by the automobile shop manager overcoming the drawbacks of existing system.
1. INTRODUCTION
Selection of right mat. Is an important
problem which an engineer has to face
Basic concern of civil engineer is design,
construction, supervision and maintenance
of different types of structures such as
buildings, bridges, canals, roads etc. Hence
engineer must have thorough knowledge of
nature and behavior of material
Key element is to deal with different types of
materials
2. INTRODUCTION
Selection of materials depends upon their
properties in relation to intend use
Overall economy of material should be
considered
6. Artificial Or Industrial Materials
Cement
Bricks
Steel
Tiles
Ceramic
Paints and Varnishes
Glass
Plastic
Stone
Lime
7. Stone
INTRODUCTION
• Derived from rocks, which form earth’s crust
& have no definite shape & structure but are
mixtures of 2/more minerals
• Almost all varieties from very soft, fine
grained to very hard, coarse grained are
available in different parts of the country
8. Stone
Requirements of Stone
Structure
Appearance-Colour Texture
Weight
Durability
Strength
Hardness
Facility of Working and Dressing
Toughness
9. Types of Stone
Igneous Rocks, Sedimentary Rocks,
Metamorphic Rocks.
Stratified, Unstratified, Foliated.
Siliceous, Argillaceous, Calcarious.
10. Uses of Stone
Used in hydraulic structures like dams and
bridges, piers, harbors.
Used in retaining wall masonry to retain soil.
Used as road metal in road construction.
Used as ballast for permanent way in railways.
Used to make concrete in the form of coarse
aggregate.
Used in foundation of structure & as a road metal
Used in monumental building & ornamental
carving
Used in flooring, paving & roofing
11. Properties of Stone
Siliceous rocks are hard and durable. They are
not easily affected by weathering actions.
Argillaceous rocks may be dense and compact or
they may be soft.
The Durability of calcareous rocks will depend
upon the constituents present in surrounding
atmosphere.
Marble and quartzite have compact crystalline
structure.
Igneous rocks contain many minerals which are
having wide range of different characteristics.
12. Brick
INTRODUCTION
• Brick are rectangular blocks made from
clay
• Clay is molded to form rectangular blocks
of standard size , which are dried and latter
burnt to high temperature to make them
dense and compact.
14. Brick
Requirements of Bricks
The colour of the brick should be red or copper and
uniform.
It should be well burnt in kilns.
The surface should be even and free from cracks.
The edges should be sharp.
15. Types of Bricks
Conventional / Traditional bricks :
Size 23 cm x 11.4 cm x 7.6 cm
Standard / Modular : Size : 19 cm x
9 cm x 9 cm
16. Types of Bricks
Bricks are classified as per manufacturing
1. Hand molded (ground or table molded)
2. Machine molded (wire cut)
17. BRICKS ARE CLASSIFIED AS PER QUALITY AND
UTILITY
There are three types of bricks,
1. First Class Bricks
2. Second Class Bricks
3. Third Class Bricks
18. Specification of First Class Bricks
• Made of good earth which is free from
saline deposits
•Burnt thoroughly without being vitrified
and have deep red, cherry and copper
color.
•Regular and uniform in shape and size
with sharp and square edges and parallel
faces.
19. Specification of First Class Bricks
• Must be homogeneous in texture and emit a clear
ringing sound on being struck together.
• Free from cracks, stones and lime.
• Should not absorb water more than 20% of its
own dry weight after 24 hours, immersed in cold
water.
• Have a minimum crushing strength of 105 kg/ sq.
cm when tested according to the test.
• Should not show appreciable sign of efflorescence
either in dry state or soaking in water.
20. • They shall be well burnt or slightly over
burnt.
• They must give clear ringing sound when
struck.
• The may have slight irregularities in size,
shape and color.
• They may have surface crack but must be
free from lime or kankar.
• The minimum crushing strength of second
class brick should be 70 kg /sq cm.
Specification of Second Class Bricks
21. Specification of Third Class Bricks
• These bricks are slightly under burnt
or over burnt.
• They are not uniform in shape, size
and edges.
• They shall not absorb water more
than 25% of their own dry weight after
24 hours, immersion in cold water.
• They have some signs of
efflorescence.
24. •Hollow bricks are mainly used in the
construction of houses.
•The raw material used in the
construction of such bricks are basically
fly ash, cement, lime, gypsum, stone dust
etc.
•These hollow bricks are lighter in weight
than the normal bricks which made it
possible to place.
25. Hollow bricks are lighter and easier
to handle, and have thermal
properties different from solid bricks.
The cut bricks are hardened by
drying for 20 to 40 hours at 50 to 150
°C before being fired.
The heat for drying is often waste
heat from the kiln.
26. QUALITIES OF A GOOD BRICKS
Bricks are manufactured from naturally
available material clay.
Bricks are light in weight compared to
stones.
They are durable .
They are low cost material.
They possess good strength.
They are easily available.
27. The shape of an ideal brick is rectangular.
It has sharp edges and corners.
The surface is regular and even.
Good bricks are of standard size:19x9x9cm
The most common colour of well burnt
brick is red .
Dark red colour of brick is indicator of over
burning and yellow colour of brick is the
indicator of under burning.
28. A single brick will weight 3.2-
3.5 kg.
Density varies from 1600– 1900
kg/m3.
Compressive strength of brick
may vary from 35 - 200kg/cm2.
Good brick shall possess a
shearing strength of 50-70
kg/cm2.
29. Water absorption value of good quality
bricks shall not be more than 20%-25%.
Higher absorption means higher porosity.
Higher absorption will lead to frost action
and efflorescence.
Durability of bricks depends on absorption
value, frost resistance and efflorescence.
Due to efflorescence brick surface covered
with white or grey patches salts.
Higher absorption results in deeper
penetration of water which becomes a
source of dampness.
30. Heat and sound conductivity
varies with their density and
porosity.
Very dense and heavy bricks
conduct heat and sound at a great
rate.
31. PROPERTIES OF BRICKS
PHYSICAL MECHANICAL THERMAL DURABILITY
SHAPE SIZE COLOUR DENSITY
COMPRESSIVE
STRENGTH
FLEXTURAL
STRENGTH
HEAT
INSULATION
SOUND
INSULATION
POROSITY
WATER
ABSORPTION
32. Uses of brick
Bricks are used in wall masonry
construction of building
Used in brick lintal construction
Bats of brick are used in concrete in
foundation work
33. Lime
Introduction
Contains clay upto 30%
Greyish white in colour
Not soluble in water
Sets slowly and hardens under water in
absence of air
Slight increase in volume
Binding is more
35. Lime
Requirement of lime
It should set easily.
It should have low shrinkage.
It should not contain impurities.
It should be moisture resistant
It should slake easily with water.
37. USES OF LIME
• Lime is used in the treatment of water and
waste water.
It is used in the manufacture of glass,
refractory sand, lime bricks and paints.
It is used as lime mortar for masonry work
of buildings.
It is used for plastering and white washing of
buildings.
It is used as lime concrete to make water
proof structures.
38. Properties of lime
It has good workability.
It stiffens quickly.
It has low shrinkage.
It has good resistant to
moisture.
Lime possesses good plasticity.
39. Cement
Cement is a building material obtained by
burning and crushing of powder form,
homogeneous and well proportioned
mixture of lime and clay.
Cement can be defined as the binding
material having cohesive & adhesive
properties which makes it capable to unite
the different construction materials and
form the compacted assembly.
40. Definition of OPC
Ordinary/Normal Portland cement is
one of the most widely used type of
Portland Cement.
The name Portland cement was given
by Joseph Aspdin in 1824 due to its
similarity in colour and its quality when
it hardens like Portland stone. Portland
stone is white grey limestone in island
of Portland, Dorset.
41. Cement
INGREDIENTS
The chief chemical components of ordinary Portland
cement are:
Calcium
Silica
Alumina
Iron
Calcium is usually derived from limestone, chalk
while silica, alumina and iron come from the sands,
clays & iron ores.
Other raw materials may include shale, shells and
industrial byproducts.
43. FUNCTIONS OF CEMENT INGREDIENTS
1. Lime(CaO)-60-67%-Proper proportion should be
maintained,
• when in excess-cause cement to disintegrate
• when less-quick setting, less strength.
2. Silica(SiO2)-17-25%-Offers strength to cement,
• when in excess, increases strength but delays
setting
3. Alumina(Al2O3)-3-8%-Reduces setting time and
lowers temperature
4. Magnesia(MgO)-0.1-4%- Imparts hardness and
colour
44. FUNCTIONS OF CEMENT INGREDIENTS
5. Iron Oxide (Fe2O3)-0.5-6%-Imparts
colour, strength and hardness
6. Sulphur(s)-1-3%-In small quantity imparts
soundness, when in excess cement become
unsound.
7. Alkalies-0.2-1%-when in excess causes
efflorescence
8. Calcium sulphate (CaSO4)-3-4%-delays
initial setting time
45. CHARACTERISTICS
1. Colour is greenish grey & Must be uniform
2. Smooth
3. Cool
4. Free from lumps
5. Not moist
6. Should not contain escess silica, lime,
alumina/ alkalies
7. Should not contain excess amt. of clay &
silt
46. Cement
Requirements of cement
Cement should Cement should not possess of
alumina which may reduce strength.
not contain alumina in excess as it weakens the
cement.
A very small amount of sulphur is added in cement
to make sound cement.
It should found cool when touch by hand.
it should be in fine powder form while checking
with first finger and thumb.
48. Uses of cement
It is used in making joints for drains ,pipes.
It is used to prepare RCC structures of building by
using reinforcement with cement concrete.
it is used in construction of buildings, bridges,
tanks, domes, flyovers, dockyard etc.
It is used to prepare cement mortar for building
construction works like masonry, plaster, painting,
flooring etc.
It is used to prepare cement concrete for various
construction works.
49. Properties of cement
1. Physical properties of cement
• Fineness
• Soundness
• Setting of cement
• Setting time
2. Mechanical properties of cement
3. Chemical composition
51. WHAT IS TIMBER?
Timber is a material which can be used for
building or carpentry and is derived from
trees. It is organic and renewable and can be
used in a wide range of applications.
In order to make best use of timber in
environmental buildings we must
understand how timber is produced and how
its natural properties effect it as a building
material.
53. Properties of timber
It has low heat conductivity.
It has small bulk density.
It is relatively high strength.
It is susceptible to decay.
It is susceptible to flame.
55. Requirement of Good Timber
• Annual ring of the section must be close to each
other.
• It should be dark uniform colour.
• It should be dense.
• It should be workable, good machinability.
• It should have uniform texture.
• When it is struck it should produce sonorous sound.
• The rays should be compact.
• It should be free from defects like dead knots,
rupture,etc.
• There should not decay of timber due to fungi and
insects like white ants and termites.
• It should be free from crakes, splits etc.
56. Seasoning
Seasoning is the reduction of
the moisture content of wood.
Seasoning is also the controlled
drying out of timber.
About 50% of the weight of
newly-felled tree is water
57. Seasoning
Reasons for Seasoning:
Seasoning helps to save the wood from
splitting.
Dry timber (< 20% MC) will not be
attacked by fungi
Dry timber is less likely to be affected by
shrinkage or distortion
After seasoning, timber will be lighter,
harder and stronger.
Seasoning produces timber that is easier to
work with.
58. Types of Seasoning
There are two types of
seasoning are as follows,
I.Natural or air seasoning
II.Artificial or kiln
seasoning
59. Natural Seasoning
Also known as Air Seasoning.
Planks of green timber are laid
down on battens and have a gap
between them to allow air to
circulate. Stickers or skids are
the small pieces of wood that
allow the air travel between the
planks.
60. Natural Seasoning
The stack should be:
-Covered to prevent rain damage while
the planks dry out.
-On a clean dry site
-All planks of the same species and
similar sizes should be kept in the one
stack
-The ends of the boards should be
protected from the sun to prevent
excessive drying-out.
61. Natural Seasoning
Advantages of Natural Seasoning
-No expensive equipment required
-Small labour cost once the stack is made
-Not wasteful of energy
Disadvantages of Natural Seasoning
-Slow drying rate
-Large area of space required
-Dependant on the weather
-Rate of seasoning cannot be carefully
controlled
-Only seasons to a MC of 18% - 22%
62. Kiln Seasoning
• The lumber is placed in large kilns (ovens) where
temperatures, humidity and drying rates are
controlled
• There are 2 types of kiln:
-Compartment Kiln & Progressive Kiln
63. Compartment Kiln
Timber is stacked similar to that
in natural seasoning only it is on a
trolley which runs on rails.
1. The kiln is closed before steam
jets in the walls, ceiling and floor
release heated steam.
2. The timber is allowed to heat up
but not dry out.
64. Compartment Kiln
3. The relative humidity of the kiln is
reduced (controlled) while the
heat is maintained. (This allows
moisture in the wood to evaporate
gradually)
4. Fans circulate the air around the
kiln.
5. Air vents allow moist wet air out
and fresh air in.
65. Progressive Kiln
The progressive kiln is a
continuous kiln. The timber goes
through the various stages of
drying as it moves through the kiln
on a trolley. The drying process is
the same as that for the
Compartment Kiln.
66. Kiln Seasoning
Advantages of Kiln Seasoning
-Quicker due to higher temperatures, ventilation and air
circulation
-Achieves a lower moisture content
-Provides greater degree of control during the drying
process
-Allows more precise rates of drying
-Allows uniform circulation through the stack
-Control over moisture content and rate of drying can be
achieved
-Artificial defects can be controlled
Disadvantages of Kiln Seasoning
-It is expensive
-Requires supervision by a skilled operator
-Is dependant on energy
67. Sand
Requirements of sand
It should be clean.
It should be well graded.
Maximum permissible clay content is 3 to 4% in
sand.
It should contain sharp, angular grains.
It should not contain salts which attract moisture
from the atmosphere.
68. Types of sand
Natural
natural sand is obtained from pits, river beds and
sea beds.
Artificial
artificial sand is formed by decomposition of
sandstone due to various weathering effects.
69. Uses
Sand is useful in various construction activities like
masonry work, plaster work, flooring and concrete
work.
Sand is used in cement mortar, plan cement
concrete , reinforced cement concrete and
prestressed concrete as key ingradient in building
construction
70. Properties of sand
It is naturally available material
It is durable
It mix with binding material easily
It has shiny luster
It is of whitish brown colour.
71. Aggregates
Requirements of Aggregates
Aggregates should be sufficiently strong.
Aggregate surface should be rough and free form
cracks.
Aggregate should have good soundness.
Aggregate should have good adhering with binding
material.
72. Types
Fine aggregates
size of aggregate is 4.75 mm or less is termed as
fine aggregates.
Coarse aggregates
size of aggregates 80mm to 4.75 mm is known as
course.
73. Uses
Fine aggregates are used to prepare cement mortar,
lime mortar and cement concrete.
Course aggregates are used to prepare cement
concrete bituminous pavement, rigid pavement etc.
They are used in construction of beams, columns,
slab, lintel etc.
74. Properties of aggregates
They are insoluble in water.
They are of moderate weight.
They are strong and durable.
They have resistance to scratches.
They have resistance to corrosion and
decay.
75. Mortar
requirements of mortar
It should have good adhesion with bricks, stones.
It should resist penetration of rain water.
It should be cheap, durable, and workable.
It should be set quickly.
The joints formed by mortar should not develop
crecks.
76. Types
As per type of binding material.
like cement, lime, gauged, gypsum, surkhi.
As per nature of application.
As per density of the mortar.
Spicial morter.
77. Uses
To bind the bricks or stones firmly in wall
construction work.
They are used in plaster work as finishing material to
provide weather resistance joints of masonry work
are covered by plaster work. White wash and colour
are applied on plastered surface easily.
Properties of mortar
Mobility.
Place ability.
Water retention
78. CONCRETE
Concrete is a mixture of cement/lime, sand, crushed
rock,water.
Preparation of concrete
<1>Ingredient of concrete
<2>Methods of mixing of concrete
*TYPES OF CONCRETE
<1>Plain cement concrete
<2>Reinforced cement conceret
<3> Precast concrete
<4>prestressed concerte
79. PROPERTIES OF CONCRETE
Workability
Strength
Durability
Dimensional stability
USES
Foundation to slabe in building
Coating materil for water proofing
82. A black or dark brown viscous
material, composed principally of high
molecular weight hydrocarbons, having
adhesive properties, derived from
petroleum either by natural or refinery
processes and substantially soluble in
carbon disulphide.
83. ORIGIN
Asphalt materials have been utilized
since 3500 B.C. In building and road
construction. Their main uses have
been as adhesives, waterproofing
agents.
These early asphalt materials were
native asphalt. These native asphalts
were found in pools and asphalt lakes.
For example Trinidad and Bermudez
lake deposits (asphalt lake).
85. Demand for paved roads/
construction exceeded the supply
of lake asphalts in late 1800, lead
to use of petroleum asphalts
86. Basic Refining Process
Asphalt is simply the residue left over from
petroleum refining.
Crude oil is heated in a large furnace to about 340°
C (650° F) and partially vaporized. It is then fed
into a distillation tower where the lighter
components vaporize and are drawn off for further
processing.
The residue from this process (the asphalt) is
usually fed into a vacuum distillation unit where
heavier gas oils are drawn off.