Modern construction technology (MCT) is a collective term used to describe a number of construction methods. These methods differ from so-called conventional construction methods such as brick and block.

2. General Seminar Presentation
On
Modern building construction technologies
Under the guidance
Of
Prof. Hassan Irtaza
And
Prof. Rizwan Ahmed Khan
Presented By
Harish saraswat
18CESM001

3.  Modern construction technology (MCT) is a collective term used to describe a
number of construction methods. These methods differ from so-called
conventional construction methods such as brick and block.

4. MCT
1. Volumetric Construction
2. Panelised Systems
3. Site Based MCT
4. Off site manufactured Sub-
Assemblies and components
5. Pods

5.  The aim of using MCT in our structures is –
A. To improve business efficiency
B. Quality Construction
C. Costumer satisfaction
D. Environmental performance
E. Sustainability and
F. Predictability of delivery timescales.

6.  Reduced overall project delivery time due to simplified construction processes
 Quicker return on investment (i.e. Earlier profitability for the client)
 Reduced site risks or accidents
 Increased on site productivity
 Improved environmental performance ( hence, sustainable development)
 Improved predictability (e.g. cost and time)
 Efficient use of site space as less site storage is needed
 Less disturbance to local communities (Noise, dust or sound etc)
 Avoidance of climatic hazards reduces delivery time
 Reduced waiting time for material testing and approval
 Need less skilled labour or people on site

7.  Higher initial cost
 Lack of experience: Manufacturers, clients, contractors
 Difficulty in obtaining finance, as it requires higher initial cost
 Potentially higher overall cost
 Limited capacity of existing manufactures
 Poor public acceptability: suspicion about meeting customer expectation
 Fewer codes available
 Limited market demand
 Expansive long distance transportation for large and heavy loads

9.  It involves the production of three-dimensional units in controlled factory
conditions prior to transportation to site.
 Also known as modular construction.
 Modules can be brought to site in a variety of forms, ranging from a basic
structure to one with all internal and external finishes and services installed, all
read for assembly.
 The casting of modules uses the benefits of factory conditions to create
service-intensive units where a high degree of repetition and a need for rapid
assemble on-site make its use highly desirable

10.  These connections can be classified into three types –
a. Inter module connection using tie-rod
b. Inter module connection using connector
c. Inter module connection using bolts

11.  Tie rod connection can be made as follows –
a. Tie rod connection with shear key and gusset plate
b. Tie rod connection with steel box
c. Tie rod connection with shear key and threaded rod

12. Tie rod connection with
shear key and gusset
plate

13. Tie rod connection with
steel box
Tie rod connection with
shear key and threaded
rod

14. Connection using
connectors

15. Connection using bolts

16.  Panelised systems include open panels (i.e. without plasterboard linings factory
fixed) and closed panels (i.e. plasterboard fixed in the factory) in both timber
and light steel framing.
 In addition, this category includes structural system such as SIPs and CLT.
0 10 20 30 40 50 60 70 80
Open panel timber frame
closed panel timber frame
Open panel light steel
closed panel light steel
Structural insulated panels
cross laminated timber
Others
Percentage use of different panel systems in last 3 years
Last 3 year

18.  Panels units available in a wide range of colours and finishes.
 Finishes can include acid resistant, smooth or coarse ground, grit or sand-
blasted, rubbed or polished.
 Panels designed to resemble natural stone can also be a produced. Highly
articulated designs can be accommodated by the mouldable concrete mix.
Benefits-
1. Faster programme times – not affected by weather or labour shortages.
2. Improves Buildability.
3. Early enclosure of dry envelope enables follow-on trades to start sooner.
4. Produces a high standard of workmanship in factory conditions – reduces
potential for accidents, addresses on-site skill shortage.
5. Has a high quality finish that can be left exposed – concrete’s thermal
properties can be exploited in low-energy buildings

19.  Reasons why people do not prefer to move from open panel system to closed
panel systems-
1. Perceptions of capital cost and up-front expenditure.
2. Being not suitable for specific project or site.
3. Reduced flexibility on site
4. Risk of damage on transport.

20.  The type of off-site manufactured components used by highest proportion of
companies are door sets, timber I-beams, prefabricated chimneys and
prefabricated dormers.
 Housing association stated use of these components is lower than that of house
builders.

21. 0 10 20 30 40 50 60 70 80 90
Door sets
Timber I-beams
Prefabricated chimneys and dormers
Floor and roof cassettes
Plumbing systems
Prefabricated foundations
Porches/door canopies
Types of off-site manufactured components used in last 3 years
Column1 Housing Associations House builders

23.  Floor and wall units are produced off-site in a factory and erected on sire to
form robust structures, ideal for all repetitive cellular projects.
 Panels can include services, windows, doors and finishes.
 Building envelope panels with factory fitted insulation and decorative cladding
can also be used as load bearing elements.
 This offers factory quality and accuracy, together with speed of erection on-
site.

25.  Twin wall technology is a walling system that combines the speed of erection
and quality of precast concrete with the structural integrity of in-situ concrete
to provide a hybrid solution.
 The prefabricated panels comprise two slabs separated and connected by cast-
in girders. The units are placed, temporarily propped, then joined by
reinforcing and concreting the cavity on site. Twin wall is usually employed in
association with precast flooring systems.

26. Benefits –
1. Faster project time due to precast elements being utilized which lead to
reduced labour costs.
2. Better quality control for reinforcement fixing and less on-site difficulties
experienced when compared with in-situ concrete.
3. Reduced labour costs for installation on site.
4. Better finish on concrete walls when compared with in-situ concrete.
5. Heavily reinforced core stability walls can be accommodated.

28.  Precast concrete foundation and wall panels can take many forms. Some
consist of steel-reinforced concrete ribs that run vertically and horizontally in
the panels. Others are solid precast concrete panels.
 Panels are precast and cured in a controlled factory environment so weather
delays can be avoided. A typical panelized foundation can be erected in four to
five hours without the need to place concrete on site for the foundation.
 Some manufactures cast the concrete against foam insulation that provides the
form during manufacture and added R-value in the wall. Panels range in size
from 2’-12’ in width by 8’-12’in height and are typically installed with a crane
on top of 4” to 6” of compacted stone.
 The controlled temperature of the processing plant allows the manufacturer to
work with concrete admixtures that focus on ultimate strength rather than cure
time and temperature. Manufactures are able to produces mixes that harden to
50,000 psi, which is stronger than concrete blocks cast in the field. Better
control of the concrete mixture and curing environment allows the use of low
w/c ratio that results in a dense material that prevents water penetration.

31.  Flat slabs are highly versatile elements widely used in construction, providing
minimum depth, fast construction and allowing flexible column grids.
 Use of column heads –
1. Increases shear strength of slab
2. Reduces the moment in the slab by reducing the clear or effective span
 Use of drop panels –
1. Increases shear strength of slab
2. Increases negative moment capacity of slab
3. Stiffens the slab and reduces deflection

32. Benefits of flat slab –
1. Flexibility in room layout
2. Saving in building height
3. Shorter construction time
4. Ease of installation of M&E services
5. Use of prefabricated welded mesh
6. Building Score

34. 0
10
20
30
40
50
60
70
Volumetric POD Panelised Sub-assemblies and
components
Site based MCT
Percentage
organizations using different MCT

35. 0
10
20
30
40
50
60
70
80
Large House builders Medium sized housed builders Housing associations
Percentage
Percentage of organisation using MCT in 2017
Volumetric POD Panelised Sub assemblies and components Site based MMC

36.  Wider publicity for generating awareness
 Education and training withing companies
 Guidelines or guidance on the use of MCT
 Industry-academia collaboration on training
 Government support to ensure finance and insurances
 Integrating modern technologies with building regulations

37. 0 10 20 30 40 50 60
Speed of construction
Improved quality of build
Ease the skills shortage
Increased number of house builts
Energy efficiency/ sustainaibility
Views on MCT's future contibution
Views on MCT's future contibution

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