8/8/2019 Report on Modern BMT http://slidepdf.com/reader/full/report-on-modern-bmt 1/21 Modern Building Materials and Technology Bibhuti Bhushan Bhardwaj a ,Azaz Ahmed b Department of Civil Engineering, School of Engg., Tezpur University, Napaam 784028, Tezpur, Assam, India Email: a [email protected], b [email protected]AbstractThe appearance, component materials, energy efficiency and environmental impact of habitable structures have changed dramatically over recent years due in large part to the successful stan- dardization of new materials, processes and technologies. Modern building materials are gaining great importance in the construction technologies in different field. From the construction of small houses to large skyscrapers it is gathering unbelievable universal acceptance. A multina- tional corporation called “Dow Corning” headquartered in Midland, Michigan, USA specializes in silicon and silicone based technology offering more than 7,000 products and services. Fire- proofing, soundproofing technologies are being used in modern buildings in developed as well as in developing countries widely. Also since the 1990s, ASTM (American Society for testing Materials) has been playing a significant role in the production of modern building materials by taking test and grading the standard and quality of the materials. Keywords: Skyscraper, Dow Corning, ASTM, Framework, Quonset hut, Prefabrication, Vortex shedding, Damper, Winslow effect. Introduction In order to compose a civil structure today, it takes more than just meeting the needs of function- ality and load carrying capacity under static loads. There is an increasing demand for slender, wide spanned structures with high adaptability to changes in use. Yet another aim is the reduc- tion of structural mass for economic reasons. Aesthetically beautiful buildings require both a mixture of beauty and workability. Appealing structures of the modern world such as the Sydney Opera house, the Burj-Al-Arab in Dubai, the Taipei 101, infinity tower etc have set up new landmarks in the Construction industry. Many of the old building materials and orthodox tech- niques failed to comply with the standards setup for such revolutionary structures. Standards bolster advances in construction technologies. The appearance, component materials, energy ef- ficiency and environmental impact of habitable structures has changed dramatically over recent years due in large part to the successful standardization of new materials, processes and tech- nologies. As expected, as the new structures are soaring towards the sky, more and more chal- lenges are confronted with. Factors such as earthquake resistance, resistance to vortex shedding,
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In order to compose a civil structure today, it takes more than just meeting the needs of function-
ality and load carrying capacity under static loads. There is an increasing demand for slender,
wide spanned structures with high adaptability to changes in use. Yet another aim is the reduc-
tion of structural mass for economic reasons. Aesthetically beautiful buildings require both a
mixture of beauty and workability. Appealing structures of the modern world such as the Sydney
Opera house, the Burj-Al-Arab in Dubai, the Taipei 101, infinity tower etc have set up new
landmarks in the Construction industry. Many of the old building materials and orthodox tech-
niques failed to comply with the standards setup for such revolutionary structures. Standards
bolster advances in construction technologies. The appearance, component materials, energy ef-
ficiency and environmental impact of habitable structures has changed dramatically over recent
years due in large part to the successful standardization of new materials, processes and tech-
nologies. As expected, as the new structures are soaring towards the sky, more and more chal-lenges are confronted with. Factors such as earthquake resistance, resistance to vortex shedding,
the volume electrical resistivity of the concrete. Strain is detected through measurement of the
electrical resistance. So, the smart concrete has the ability to sense tiny structural flaws before
they become significant, which could be used in monitoring the internal condition of structures
and following an earthquake. In addition, the presence of the carbon fibres also controls the
cracking so that the cracks do not propagate catastrophically, as in the case of conventional con-
crete [4].
7. Metal
Metal is used as structural framework for larger buildings such as skyscrapers, or as an external
surface covering. There are many types of metals used for building. Steel is a metal alloy whose
major component is iron, and is the usual choice for metal structural building materials. It is
strong, flexible, and if refined well and/or treated lasts a long time. Corrosion is metal's prime
enemy when it comes to longevity. The lower density and better corrosion resistance of alumin-
ium alloys and tin sometimes overcome their greater cost. Brass was more common in the past,
but is usually restricted to specific uses or specialty items today. Metal figures quite prominently
in prefabricated structures such as the Quonset hut, and can be seen used in most cosmopolitan
cities. It requires a great deal of human labour to produce metal, especially in the large amounts
needed for the building industries. Other metals used include titanium, chrome, gold, silver. Ti-
tanium can be used for structural purposes, but it is much more expensive than steel. Chrome,gold, and silver are used as decoration, because these materials are expensive and lack structural
qualities such as tensile strength or hardness [5].
8. Glass
In modern structures, glass is also used as a construction material for outer beauty of the struc-
ture. Using clear windows in houses has been known from the days glass since glass was in-
vented but now glass is used to cover the whole façade of a building as a curtain wall to cover open roof known as space frames for big halls and lobbies. Glass needs some sort of holding
mechanism and suspensions to stay longer as glass itself is very delicate and easy to be broken
material. Other than all the above mentioned materials, materials like Ice are use to construct
Eskimos in ice lands.
Natural materials are still considered best in some regions for the purpose of construction. Fabric
is used to construct tents and tent houses. Plastic and foam is also used in construction for differ-
The term plastic covers a range of synthetic or semi-synthetic organic condensation or polymeri-
zation products that can be moulded or extruded into objects or films or fibres. Their name is
derived from the fact that in their semi-liquid state they are malleable, or have the property of
plasticity. Plastics vary immensely in heat tolerance, hardness, and resiliency. Combined with
this adaptability, the general uniformity of composition and lightness of plastics ensures their use
in almost all industrial applications today [5].
10. Foam
More recently synthetic polystyrene or polyurethane foam has been used in combination with
structural materials, such as concrete. It is light weight, easily shaped and an excellent insulator.
It is usually used as part of a structural insulated panel where the foam is sandwiched between
wood and cement or insulated concrete forms where concrete is sandwiched between two layers
of foam [5].
Some Modern Technologies:
Soundproofing
Specialty Vinyl for Soundproofing and Other Noise Stopping MaterialsFrequently called Mass Loaded Vinyl (MLV), these materials certainly have their place and can
be used in many different ways to stop the transfer of noise. Sometimes this is described as a
panacea (cure all – solve all) and it is not.
Always it has to be remembered the principle of mass: if it does not weigh much it will not stop
much. Also people should realize that adding together several high mass layers does not help
either.
Insulation or How to Fill the Wall Cavities
Stuffing the walls with insulation is bad. People are taking out the air that is helpful in insulating
and stopping noise.
Using the pink stuff is easiest and economical. It works okay. Most insulation does very little to
help noise reduction [6].
Lead Lined Sheetrock
Uses about a 1/8 inch sheet of lead glued to one side of the sheetrock and installed with the lead
facing the studs.
This is an excellent noise reducer, but can cost ` 6250-12500 per piece of sheetrock [6].
installed configuration, because excessively light inorganic fireproofing does not provide ade-
quate protection and are thus in violation of the listings.
New materials based on organic chemistry are gaining in popularity for a variety of reasons. In
land-based construction, thin-film intumescents have become more widely used. Unlike their
inorganic competitors, thin-film intumescents are installed like paint, except that the purpose is
to achieve a certain thickness, not just to apply a different colour, and do not require the con-
cealment of structural steel elements such as I-beams and columns. Care must be taken to ensure
that such products are protected from atmospheric moisture and operational heat, which can ad-
versely affect these organic, covalently bound products. The use of DIBt approved products,
which mandates testing of the effects of ageing, is prudent.
Thicker intumescent and endothermic resin systems tend to use an oil basis (usually epoxy),
which, when exposed to fire, creates so much smoke, that even though these products provideenough heat flow retardation towards the substrate, they tend to be banned from use inside of
buildings because of the smoke they develop when subjected to fire, and are used mainly in exte-
rior construction, such as LPG vessels, vessel skirts and pipe bridges in oil refineries, chemical
plants and offshore oil and gas platforms.
Proprietary boards and sheets, made of gypsum, calcium silicate, vermiculite, perlite, mechani-
cally bonded composite boards made of punched sheet-metal and cellulose reinforced concrete
(Dura Steel) have all been used to clad items for increased fire-resistance. Cladding is tradition-
ally much more popular and organised in Europe than in North America. Fringe methods have
also included intumescent tapes and sheets, as well as endothermically treated ceramic fibre
sheets and roll materials. The latter work well but are not particularly popular due to cost rea-
sons.
Ordinary ceramic fibre, typically encased in thin aluminium foil is often used to protect pressuri-
sation ductwork and grease ducts in North America. Such mineral wool (rock wool) wraps have
been used in Europe for decades more than in North America. European construction sites tend
to use much less expensive mineral wool wraps for duct fireproofing. All are qualified to the
same test regime: ISO6944, with the exception that systems qualified for the North America
market also undergo a hose-stream test immediately following the fire exposure in order to vali-
date the fire stop portion of the system [7].
Natural Fibre Reinforcement of Large-Scale Composite Polymer Panels
Recently, natural fibres (NF) have been investigated as filler materials capable of serving as lo-
calized tensile reinforcement and volume fillers within several types of polymer matrices. A
number of natural fibres have been under continued investigation for use in natural fibre rein-
and bamboo. These fibres have been coupled in a matrix primarily composed of two commodity
plastic matrix materials: polyethylene (PE) and polystyrene (PS). While specific mechanical
properties of natural fibres vary according to the particular fibre, the overall performance of
natural fibres lies within a relatively tight range as a result of similar molecular composition. An
increasing amount of interest has developed over the past few years for NFRCs because of their
ease of production, subsequent increase in productivity, cost reduction, lower density and weight
and use of renewable resources. The automobile industry has begun to apply NFRCs in a variety
of exterior and interior panel applications. The significant weight savings and the ease and low
cost of the raw constituent materials have made NFRCs an attractive alternative material to glass
and carbon fibre reinforced polymer composites. However, further research needs to address
significant material and production obstacles before commercially available NFRCs are widelyused in architectural and civil works [8].
Earthquake Resistant Building Technology
Ground shaking from earthquakes can collapse buildings and bridges; disrupt gas, electric, and
phone services; and sometimes trigger landslides, avalanches, flash floods, fires, and huge, de-
structive ocean waves (tsunamis). Buildings with foundations resting on unconsolidated landfill
and other unstable soil, and trailers and homes not tied to their foundations are at risk becausethey can be shaken off their mountings during an earthquake. When an earthquake occurs in a
populated area, it may cause deaths and injuries and extensive property damage. It is for this rea-
son that it is often said,
“ Earthquake don’t kill people, buildings do.”
Earthquake resistant building design philosophy
a) Under minor but frequent shaking, the main members of the buildings that carry vertical and
horizontal forces should not be damaged; however buildings parts that do not carry load may
sustain repairable damage.
b) Under moderate but occasional shaking, the main members may sustain repairable damage,
while the other parts that do not carry load may sustain repairable damage.
c) Under strong but rare shaking, the main members may sustain severe damage, but the build-
There are various new techniques which help in reducing the impact of earthquake forces on
buildings. Most of these techniques are expensive to implement.
Here is a list of Earthquake Resistant Techniques:
1. Base Isolation for Earthquake Resistance
The concept of base isolation is explained through an example building resting on frictionless
rollers. When the ground shakes, the rollers freely roll, but the building above does not move.
Thus, no force is transferred to the building due to the shaking of the ground; simply, the build-
ing does not experience the earthquake. Now, if the same building is rested on the flexible pads
that offer resistance against lateral movements, then some effect of the ground shaking will be
transferred to the building above. If the flexible pads are properly chosen, the forces induced by
ground shaking can be a few times smaller than that experienced by the building built directly on
ground, namely a fixed base building. The flexible pads are called base-isolators, whereas the
structures protected by means of these devices are called base-isolated buildings.
2. Energy Dissipation Devices for Earthquake Resistance
Another approach for controlling seismic damage in buildings and improving their seismic per-
formance is by installing Seismic Dampers in place of structural elements, such as diagonal
braces. These dampers act like the hydraulic shock absorbers in cars as“ much of the sudden
jerks are absorbed in the hydraulic fluids and only little is transmitted above to the chassis of the
car. When seismic energy is transmitted through them, dampers absorb part of it, and thus damp
the motion of the building.
3. Active Control Devices for Earthquake Resistance
The system consists of three basic elements:
a. Sensors to measure external excitation and/or structural response.
b. Computer hardware and software to compute control forces on the basis of observed excita-
tion and/or structural response.
c. Actuators to provide the necessary control forces.
Thus in active system has to necessarily have an external energy input to drive the actuators. On
the other hand passive systems do not required external energy and their efficiency depends on
tunings of system to expected excitation and structural behaviour. As a result, the passive sys-
tems are effective only for the modes of the vibrations for which these are tuned. Thus the ad-vantage of an active system lies in its much wider range of applicability since the control forces
As with any construction in the Middle East, Dow Corning’s technical experts were confronted
with testing and specifying products that are able to withstand the rigours of high temperature,
ultra-violet light, seismic activity and inclement weather conditions including sandstorms and
high winds. Special mixes of concrete are made to withstand the extreme pressures of the mas-
sive building weight; as is typical with reinforced concrete construction, each batch of concrete
used was tested to ensure it could withstand certain pressures. The consistency of the concrete
used in the project was essential. It was difficult to create a concrete that could withstand both
the thousands of tonnes bearing down on it and Persian Gulf temperatures that can reach 50 °C.
To combat this problem, the concrete was not poured during the day. Instead, during the summer
months ice was added to the mixture and it was poured at night when the air is cooler and the
humidity is higher. A cooler concrete mixture cures evenly throughout and is therefore lesslikely to set too quickly and crack.
2. Burj-Al-Arab:
Burj-Al-Arab situated in Dubai, UAE is currently holding the tallest hotel in the world. The tall-
est sea-based hotel in the world at a height of 321 metres, the Burj Al Arab Hotel is a landmark
icon on the Dubai skyline. An artificial island was created to support this architectural and tech-
nical marvel. Inspired by the wind filled sails of an Arab trading ship, the sail facade features aunique double-skinned Teflon-coated woven glass fibre screen.
• The Dow Corning product range was chosen to provide the reliable solutions such a unique
construction project required, especially under these particular weather conditions. The facade
was sealed with Dow Corning 993, Dow Corning 984 and Dow Corning Q3-3793 silicone seal-
ants. The very large aquarium in the foyer was sealed with Dow Corning 795, while Firestop 400
was used internally. In fig. 4 Burj-Al-Arab is shown.
The Dow Corning product range was once again chosen to provide the reliable solutions such a
unique construction project required, especially under these particular weather conditions. The
facade was sealed with Dow Corning® 993, Dow Corning® 984 and Dow Corning® Q3-3793
silicone sealants. The very large aquarium in the foyer was sealed with Dow Corning® 795.
Firestop 400 was used internally. Additionally, the completion of the project required Dow
Corning’s co-operation with companies in the UK, US, Japan and Dubai. Dow Corning success-
fully met the challenge of delivering solid solutions for imaginative construction projects when
operating on an global basis. Combining the latest technological trends and working globally,
Dow Corning has sealed what is considered as a symbol of Arabian hospitality. The Burj-Al-
The lateral load resisting system for the Tower consists of a combination of a moment-resisting
perimeter tube frame and a circular central core wall, connected by the two-way spanning rein-
forced concrete flat plate slabs at each level acting as rigid diaphragms. This system maximizes
the effective structural ‘footprint’ of the Tower by utilizing a significant amount of the vertical
reinforced concrete for lateral load resistance.
The design philosophy for the Tower is based upon the exterior form of the building as a direct
expression of the structural framework. The engineers studied a series of options for the perime-ter frame in order to create the unique twisting geometry of the Tower. Ultimately it was deter-
mined that there were distinct advantages to stacking the columns. Each column slopes in one
direction, and is offset over the column below, in order to generate the twisting building form.
As the perimeter columns ascend from story to story, they lean in or out, in a direction perpen-
dicular to the slab edge. At every level, the columns shift in position along the spandrel beams so
that each column maintains a consistent position at each floor relative to the tower envelope. The
corner columns and the six (6) interior columns twist as they ascend.
Due to the unique twisting geometry of the Tower, the structure has a natural tendency to un-
dergo additional horizontal ‘twist’ movement under gravity loads, a significant portion of which
results from the self-weight of the cast-in-place structure. Additional movement is expected dur-
ing construction and over the life of the structure due to creep and shrinkage effects of the cast-
in-place concrete. In order to understand the potential movement of the structure, a detailed
analysis was performed taking into account the anticipated construction sequence, and time de- pendent variables; such as creep, shrinkage, and variation in concrete material properties [14].
Advantages of Modern Building Materials
The main advantage of modern building materials is that they are very strong and reliable in
comparison to the common and older building materials. For example, steel is more reliable as
well as strong than ordinary bamboo or such type of things. Moreover steel should not be re-
placed by the same after certain interval of time as in case of other materials like bamboo or
wood this should be done periodically; as it is affected by moisture etc. Moreover the traditional
building materials such as bamboo, wood etc. are enhancing deforestation while they modern
building materials are not.
Let’s take an example to see how modern building materials are far better than the ordinary
common materials. It is known that ceiling in common houses is are made up of ply wood or
other wooden things .But when it comes to modern technology, it can be seen how other materi-
als are being used to replace ordinary wood etc.Aluminium Ceiling
Aluminium ceilings are installed like all other drop ceilings as the panels are fitted to the previ-
ously built framework. Those ceilings are very endurable and look attractive even after long
time. As aluminium ceilings consist also from different panels it is not hard to install further
lights or ventilation to the ceiling. To build those aluminium ceilings an aluminium alloy has
been created to especially suit to manufacture those beautiful art metal ceiling panels. Alumin-
ium is a corrosion resistant, very durable product that does not rust, unlike steel, which is used
by some manufactures of pressed tin. The ceiling panels are still widely known as pressed tin
even though they are not made from tin, but from long- lasting aluminium. When special alu-
minium alloy is pressed into different ceiling panels it holds its shape permanently and hardens
substantially. Aluminium ceiling is longer- lasting than a plaster ceiling. These ceilings will not
rust or crack and the material that they are made from are non- porous, therefore it resists mois-
ture and odour very well. Decorated aluminium ceiling panels add more value to your home than
it costs to have them installed or install them yourself. They can be painted in a lot of different
ways creating works of art on your ceiling to your flavour [15].
Steel Ceiling
A metal ceiling panel designed and patented at Soundproof Ceilings, the innovative Click panel
installs easily onto standard 15/16" suspension system for new construction areas or existing grid
for remodelling projects. Featuring a downward design which aids in the ease of installation and
allows future access to the area above the suspended ceiling. The Click panel is the answer for
the ceiling mechanic and building maintenance engineer. The unique spring action clips on each
panel allows the installer to hear an audible "CLICK" when the panel is properly positioned and
prevents the panel from being dislodged or moved. A specially designed removal tool provides
authorized personnel with easy access. Design and function harmonize with a host of beautiful
metallic and painted finishes, which can be customized to suit your specific design applications.
The Click is available with either 1/4" reveal edge detail or a flush bevelled edge for a com-
pletely concealed system. Steel or aluminium panels are available and can be used with standard
light fixtures and diffusers. Custom acoustical perforated panels are also available [16].In the present, the main alternative material available is concrete block, which has several advan-
tages stated as:
1. Fast in construction.
2. Give more spaces, whereas bearing wall can be constructed with 200mm thick.
3. A relatively low cost, since cement mortar used is much less than that required for stone.
Nowadays, building using concrete block in Yemen cost about ` 75 per square meter.
4. Have good and acceptable bearing strength make it applicable for constructing bearing wall
[17].
Disadvantages of Modern Building Materials
The major disadvantage of modern building materials is that, it is costlier than the old traditional
materials. Besides the natural building materials can be obtained without any cost. So, the mod-
ern building materials seem to be costlier than the other materials due to which people of devel-
oping countries cannot afford for modern building materials.
[10] Paine Anthony "Mega structure". Architectural Review, The. . FindArticles.com. 15 Sep-
tember 2008. http://findarticles.com/p/articles/mi_m3575/is_n1201_v201/ai_19498628 & Mir, Ali (2001). Art of the Skyscraper: the Genius of Fazlur Khan. Rizzoli International Publications.
ISBN 0847823709.
[2] Piezoelectric Materials. (n.d.). In Azomaterials- The A to Z of materials. Retrieved Septem-
ber 15, 2010, from http://www.azom.com/Details.asp?ArticleID=81
[15] Soundproof suspended ceilings. Retrieved September 21, 2010, from