Mortar is a workable paste used to bind construction blocks together and fill gaps. It is typically made of sand, a binder like cement or lime, and water. Mortar hardens after setting to form a rigid structure. Different types of mortar are used depending on the binder, intended use, and required properties. Cement mortar provides high strength and is used for load-bearing walls. Lime mortar is used above ground, while mud mortar is a cheaper option for ordinary buildings. Special mortars include fire-resistant, lightweight, and sound absorbing varieties.
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
The word concrete comes from the Latin word "concretus". Which means compact.Now a days concrete is most common and necessary things in our life.
The history of cementing materials together goes back to the time when prehistoric man prepare his cave to build shelter.
He used mud and clay to fill the gap between stone. To keep out the wind and cold.
Later the Assyrians and Babylonians used clay as their bonding substance and straw to make a shape.
The Egyptians used lime and gypsum and crushed stone to create a material that would harden even better.
Sand is a naturally occurring granular material composed of finely divided rock and mineral particles.
the most common constituent of sand is silica (silicon dioxide, or SiO2), usually in the form of quartz.
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
The word concrete comes from the Latin word "concretus". Which means compact.Now a days concrete is most common and necessary things in our life.
The history of cementing materials together goes back to the time when prehistoric man prepare his cave to build shelter.
He used mud and clay to fill the gap between stone. To keep out the wind and cold.
Later the Assyrians and Babylonians used clay as their bonding substance and straw to make a shape.
The Egyptians used lime and gypsum and crushed stone to create a material that would harden even better.
Sand is a naturally occurring granular material composed of finely divided rock and mineral particles.
the most common constituent of sand is silica (silicon dioxide, or SiO2), usually in the form of quartz.
Gives information about various building materials, classification of buildings, types of loads, building components their functions and nominal dimensions.
B-Tech Construction Material Presentaion.pptmosesnhidza
Concrete is a mixture of cement, aggregates and water, with any other admixtures which may be added to modify the placing and curing processes or the ultimate physical properties.
Plastering is the process of covering rough surfaces and uneven surfaces with a plastic material, called plaster or mortar to obtain an even , smooth , regular , clean & durable surface.
Students, digital devices and success - Andreas Schleicher - 27 May 2024..pptxEduSkills OECD
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The empire's roots lie in the city of Rome, founded, according to legend, by Romulus in 753 BCE. Over centuries, Rome evolved from a small settlement to a formidable republic, characterized by a complex political system with elected officials and checks on power. However, internal strife, class conflicts, and military ambitions paved the way for the end of the Republic. Julius Caesar’s dictatorship and subsequent assassination in 44 BCE created a power vacuum, leading to a civil war. Octavian, later Augustus, emerged victorious, heralding the Roman Empire’s birth.
Under Augustus, the empire experienced the Pax Romana, a 200-year period of relative peace and stability. Augustus reformed the military, established efficient administrative systems, and initiated grand construction projects. The empire's borders expanded, encompassing territories from Britain to Egypt and from Spain to the Euphrates. Roman legions, renowned for their discipline and engineering prowess, secured and maintained these vast territories, building roads, fortifications, and cities that facilitated control and integration.
The Roman Empire’s society was hierarchical, with a rigid class system. At the top were the patricians, wealthy elites who held significant political power. Below them were the plebeians, free citizens with limited political influence, and the vast numbers of slaves who formed the backbone of the economy. The family unit was central, governed by the paterfamilias, the male head who held absolute authority.
Culturally, the Romans were eclectic, absorbing and adapting elements from the civilizations they encountered, particularly the Greeks. Roman art, literature, and philosophy reflected this synthesis, creating a rich cultural tapestry. Latin, the Roman language, became the lingua franca of the Western world, influencing numerous modern languages.
Roman architecture and engineering achievements were monumental. They perfected the arch, vault, and dome, constructing enduring structures like the Colosseum, Pantheon, and aqueducts. These engineering marvels not only showcased Roman ingenuity but also served practical purposes, from public entertainment to water supply.
Ethnobotany and Ethnopharmacology:
Ethnobotany in herbal drug evaluation,
Impact of Ethnobotany in traditional medicine,
New development in herbals,
Bio-prospecting tools for drug discovery,
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Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
Model Attribute Check Company Auto PropertyCeline George
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2. MORTAR
Mortar is a workable paste used to bind construction blocks
together and fill the gaps between them. The word comes from
Latin moratorium meaning crushed.
Mortar may be used to bind masonry blocks of stone, brick, etc.
Mortar becomes hard when it sets, resulting in a
rigid aggregate structure.
Mortar can also be used to fix, or point, masonry when the original
mortar has washed away
3. MORTAR
• Mortars are usually named according to the binding
material used in their preparation.
• They are essentially required for masonry work,
plastering and pointing etc.
FUNCTIONS OF MORTAR:
• To bind together the bricks or stones properly so as to
provide strength to the structure.
• To form a homogenous mass of the structure so as to
resist all
the loads coming over it without
disintegration.
4. Composition of Mortar
Modern mortars are typically made from a mixture of
sand,
a binder such as cement or lime, and
water.
5. An ideal mortar:
Adheres completely and durably
to all the masonry unit to
provide stability.
Remains workable long enough to enable the operative to set the
masonry unit right to line and level; this implies good water
retentivity.
Stiffens sufficiently quickly to permit the laying of the units to
proceed smoothly, and provides rapid development of strength
and adequate strength when hardened.
Is resistant to the action of environmental factors such as frost
and/or abrasion and the destructive effects of chemical salts such
as sulfate attack.
Resists the penetration of rain.
Accommodates movement of the structure.
Accommodates irregularities in size of masonry units.
Contributes to the overall aesthetic appearance.
Is cost effective
6. Mortar as Binding Material
Pointing
Masonry joint
Plastering
Cement Slurry
9. Workability
Workability may be defined as the behavior of a mix in
respect of all the properties required, during application,
subsequent working and finishing.
Ease of use, i.e. the way it adheres or slides on the trowel.
Ease of spread on the masonry unit.
Ease of extrusion between courses without excessive
dropping or smearing.
Ease of positioning of the masonry unit without movement
due to its own weight and the weight of additional courses
10. Water Retentivity & Air content
This is the property of mortar that resists water loss by
absorption into the masonry units (suction) and to the air, in
conditions of varying temperature, wind and humidity.
Water retentivity is related to workability.
The air content of the mortar in its plastic state is also
important. In order to achieve good durability it is necessary
that there is sufficient air content (entrained air) to enable
freeze-thaw cycles to be resisted without disrupting the
matrix of the material.
11. Stiffening and hardening
The progression of stiffening, defined in the European
Standard as workable life, refers to the gradual change from
fresh or plastic mortar to setting or set mortar.
Hardening refers to the subsequent process whereby the set
mortar progressively develops strength.
12. Properties of hardened
mortar
Durability of mortar may be
defined as its ability to
endure aggressive conditions
during its design life. A
number
of
potentially
destructive influences may
interact with the mortar:
these include water, frost,
soluble
salts
and
temperature change. In
general, as the cement
content increases so will
durability. Air entrainment
of
mortars
improves
resistance to freeze-thaw
damage.
13. Compressive strength
The use of too much cement will produce
a more rigid mortar, which may result in
vertical cracking passing through units
and mortar joints as stresses are imposed
Use of the appropriate mortar should not
result in cracking, but any that does
occur, (e.g. due to movement), will tend
to follow the joints, which will be much
easier to repair
14.
15. Flexural strength
Traditional masonry construction
tended to be massive relative to
modern structures, typically with
very thick walls. This meant that
the mass or bulk generally resisted
the various forces applied to it.
The development of modern
masonry units and advances in
mortar technology have led to
more slender structures which are
more vulnerable to lateral forces
e.g. wind loads.
16. MIXING THE MORTAR:
•The sand and the cement have to
be thoroughly mixed by hand or in
a mechanical mixer before adding
any water - do not use dirty water,
or water from puddles or ponds, as
this could impair the final strength
of the mortar.
•Similarly, keep any sugarcontaining liquids, such as soft
drinks, well away from the mix sugar, even in small amounts,
seriously impairs the setting ability
of the cement.
17.
18. Types of Mortars
Mortars are classified on the basis of the following
BULK DENSITY
KIND OF BINDING MATERIAL
NATURE OF APPLICATION
SPECIAL REQIREMENTS
19. By Bulk Density
According to the bulk density of mortar in dry
state , there are two types of mortars.
Heavy Mortar Bulk Density =/> 1500 kg/m3
Lightweight Mortar -
Bulk Density < 1500 kg/m3
20. Kind of binding material
Lime Mortar
Lime – Surkhi Mortar
Mud Mortar
Cement Mortar
21. FUNCTION OF SAND AND SURKHI IN MORTARS:
Functions of sand:
•It reduces shrinkage of the building material.
•It prevents development of cracks in the mortar on
drying.
•It helps in making mortars and concretes of desired
strength by varying its proportions with the binding
material.
•A well graded sand adds to the density of mortars and
concretes.
Functions of surkhi:
•It provides brick color and make the mortar economical
23. LIME MORTAR
Lime mortar is a type of mortar composed of lime and
an aggregate such as sand, mixed with water.
Lime mortar is primarily used in the conservation of buildings
originally built using lime mortar, but may be used as an
alternative to ordinary portland cement.
A lime kiln is used to produce quicklime through
the calcination of limestone (calcium carbonate).
CaCO3 + heat → CaO + CO2
24. Quick Lime
Calcium
oxide (CaO),
commonly
known
as quicklime or burnt lime, is a widely used chemical
compound. It is a white, caustic, alkaline crystalline solid at
room temperature usually obtained from limestone.
Slaking of Lime
When water is added to quick lime in sufficient quantity,
lime cracks, swells and falls into powder form due to the
chemical reaction thus forming calcium hydrate
Ca(OH)2.
25.
26.
27. Lime mortar:
•The paste is prepared by mixing lime and sand or surkhi in
suitable proportions in addition to water.
•If surkhi is to be added in lime mortar the equal proportions of
sand and surkhi should be mixed with lime.
•These mortars are inferior to cement mortars in strength as well
as water tightness.
•These mortars should not be used for underground works as they
set in the presence of carbon dioxide and break up in damp
conditions.
•This type is used for construction work above ground level i.e.
exposed positions.
28. Ht: 40 cm
6 – 9 m Dia
BULLOCK DRIVEN GRINDING MILL
Width: 30 cm
33. Mud mortar:
•The paste is prepared by mixing suitable clay, soil with
water.
•The soil which is used for preparing mud mortar
should be free from grass, pebbles etc.
•These are the cheapest mortars but weakest in
strength.
•These mortars are used for brickwork of ordinary
buildings and for plastering walls in rural areas.
48. Cement mortar:
•The paste is prepared by mixing cement and sand in
suitable proportions in addition to water.
•The general proportion is 1 part of cement to 2-8 parts
clean sand.
•These mortars must be use within half an hour, i.e.;
before initial setting time of the cement.
•This type is used for all engineering works where high
strength is desired such as load bearing walls, deep
foundations, flooring etc.
49. •When mixing by hand, the sands and cement are heaped up on a
mixing board or in a wheel barrow and repeatedly turned over
and over until thoroughly mixed.
•The color of the dry mix will change as the cement is
distributed throughout - there should be no 'streaking' of
cement, and no clumps of pure sand or pure cement.
•Once the dry ingredients are mixed, the water can be added.
50. Dry sand and cement in
wheelbarrow
Begin to mix sand and cement
Mix to evenly distribute cement
The dry mix should be all one colour
Add water and plasticiser
Mix to required consistency
51. •When using a mechanical mixer, add half a bucket (2 or 3
liters) of clean cold water to the empty drum before adding the
dry ingredients in sequence.
• Add 4 measures of sand then 1 of cement, followed by 4 sand,
then another cement and so on until the required quantity is in
the mixer.
•This ensures a more thorough mix than adding, say, 20
measures of sand and then 5 measures of cement.
•Again, the water is added to the revolving
drum once the dry ingredients are
thoroughly blended, a bit at a
time until the required consistency
is achieved.
52. For wide joints in paving or for stonework, either as
paving or as walling, a coarser mortar is often preferred
- replace half of the building/soft sand with grit/sharp
sand. You will probably find that a coarse mortar such
as this requires less gauging water to achieve a working
consistency than does a bricklaying/general purpose
mortar.
Mortar for Wide Joints
2 x Building Sand plus
2 x Grit Sand plus
1 x cement
54. Fire resistant mortar:
•The paste is prepared by mixing aluminous cement
and finely crushed fire bricks (1:2) in suitable
proportions in addition to water.
•The usual proportion are 1 part aluminous cement to
2 parts of finely crushed fire bricks.
•These are generally used for lining furnaces, ovens and
fire places with fire bricks.
55. Light weight mortar:
•The paste is prepared by mixing wood powder, wood
sawing or saw dust with cement or lime mortar.
•In such mortars fibers of jute coir or asbestos fibers can
also be used.
•These are generally used as fiber plasters in sound and
heat proof construction.