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PPLIC TION OF LIGHT WEIGHTGGREG TES TO FFORD BLEHOUSING
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Introduction
Effect of Lack of affordable housing
When is housing affordable?
Features of affordable housing
Homelessness
Solutions of the affordability problem
Reduction in building and management
costs
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LWA
Types of LWA
Advantages of LWA
Disadvantages of LWA
Conclusion
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Lack of affordable housing crisis for
both communities & individual households
For communitiesattracting & keepingemployment opportunities; qualityneighborhoods
For householdsself-sufficiency, stability
& improves life outcomes for children
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When is Housing Affordable?
A household should spend no morethan 30% of its total income onhousing costs, including mortgage or
rent payments & utilities
More than 30%: housing costburdened
More than 50%: severely housing costburdened
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Features Of Affordable Housing
Built, operated and disposed of in a
resource- efficient manner with aim to
minimize the overall impact on the built
environment, human health and natural
environment.
High performance building designed.
Efficient use of material and resource.
Indoor environmental quality and innovation.
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Homelessness
A failure to find affordable housing leads tohomelessness
Homelessthose in shelters or in a publicor private place
Hidden homelessliving with relatives orfriends (doubled up) in overcrowded
conditions or living in substandard housing
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Reduction in building & management costs--Streamlined building methods &
standardized components
--Factory-built housing
--Donated labor & materials
--Resident labor (sweat equity)
Reduction in finance costs
--Low-interest loans for constructing orrehabilitating affordable housing
--Low Income Housing Tax Credit
Solving the Affordability Problem
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Increaseresourcesforhousing
--Builders might produce affordable
housing
--Home purchase assistance to low- &
moderate-income homebuyers
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REDUCTION IN BUILDINGAND MANAGEMENT COSTS
(Application of LWA toaffordable housing)
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Light Weight Aggregates
(LWA)
Natural or synthetic which weighs lessthan 1100 kg/m3 .
Low bulk specific gravity
High absorption values
Used in production of light concreteproducts such as concrete blocks and
structural concrete. Produced from clay, shale, slate.
Cellular, high internal porousmicrostructure
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Naturally Occuring LWA
Expanded pertile
Expanded glass
Natural pumice
Processed and Natural LWA
Expanded shale, clay, slate Vermiculite
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Synthetic LWA
Foamed slag
Expanded perlite
Pumice
Expanded glass
Brick rubble
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Advantages Of LWA
Reduced mass: As aggregates are hollowhence have less density and weight.
Thermal insulation: Reduces thetemperature in hot weather and keep theroom temperature low.Thermal resistance of LWC is upto 6 times
that of NWC.
Sound insulation: Due to its porous structureit provides sound insulation.
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Fire resistance
Reduce dead load: Owing to reduced
dead load by using lightweight
aggregates, there are savings instructural material such as the cost of
foundation.
Better physical properties: lower
modulus, lower coefficient of thermal
expansion, easier drilling.
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Durability: It enhances higher durability byhaving lower coefficient of thermal expansionwhich reduces the thermal movement.
Environment friendly: It brings aboutenvironmental benefits when industrial wasteproducts are used to manufacture lightweight
aggregates.
Cheaper: Its cost is less as compared toNWA.
Improved freeze-thaw resistance: It haslower permeability and higher resistance tofreeze-thaw cycles when compared with
normal aggregates
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Disadvantages Of LWA
More brittle
Greater care is required in controllingwater content, mixing and supervision.
Special measures for pumpingconcrete
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Conclusion
Application of LWA may lead to aaffordable housing.
LWA is a cheap and durable material.
Every individual would be able to haveits own house as LWA reduces the
cost of construction as compared to
NWA.
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THANK YOU
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