Application of Light Weight Aggregates to Affordable Housing (1)

8/12/2019 Application of Light Weight Aggregates to Affordable Housing (1)

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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

Documents

Application of Light Weight Aggregates to Affordable Housing (1)