Performance Evaluation of Low Cost Housing Material

Abstract

Rapid urbanisation and population growth in developing countries like India have created an urgent need for affordable housing solutions. Conventional building materials such as burnt clay bricks, steel, and reinforced cement concrete are increasingly expensive, making housing unaffordable for low-income communities. This paper evaluates the performance of five low-cost housing materials — fly ash bricks, hollow concrete blocks, stabilised mud blocks, bamboo, and ferrocement based on compressive strength, water absorption, density, thermal insulation, and cost effectiveness. Laboratory tests were conducted and the results compared against conventional benchmarks. The findings demonstrate that fly ash bricks offer the best balance of strength, cost, and environmental impact; ferrocement provides the highest structural strength; stabilised mud blocks deliver superior thermal insulation at minimal cost; and bamboo remains the lightest and most sustainable option for rural construction. The combined use of these materials can reduce overall construction costs by 20–30% while maintaining adequate structural safety and durability. The paper also presents a case-study application of a single-storey 40 m2 residential unit to validate the practical feasibility of these materials.

Introduction

This study explores the potential of low-cost housing materials as a solution to India's growing housing shortage, particularly for Economically Weaker Sections (EWS) and Low-Income Groups (LIG). Rising prices of conventional construction materials such as cement, steel, and fired clay bricks have made affordable housing increasingly difficult. Low-cost housing aims to reduce construction costs without compromising structural safety, durability, or habitability by using locally available, recycled, and sustainable materials.

Objectives

The study aimed to:

• Investigate different low-cost housing materials.
• Evaluate their compressive strength, water absorption, density, and thermal conductivity.
• Compare their performance and cost with conventional materials.
• Identify advantages and limitations of each material.
• Recommend suitable material combinations for affordable housing in India.

Materials Studied

Five commonly used low-cost construction materials were examined:

1. Fly Ash Bricks (FAB)
   • Compressive strength: 7–10 MPa
   • Water absorption: 10–15%
   • Lightweight, eco-friendly, and economical.
   • Reuses industrial waste from thermal power plants.
2. Hollow Concrete Blocks (HCB)
   • Lightweight with good thermal insulation.
   • Require less mortar and enable faster construction.
   • More durable than many alternative materials.
3. Stabilized Mud Blocks (SMB)
   • Produced from local soil mixed with cement or lime.
   • Very low cost and excellent thermal insulation.
   • Lower water resistance and require protective treatment in wet climates.
4. Bamboo
   • High tensile strength (140–280 MPa) and very low weight.
   • Renewable, sustainable, and locally available.
   • Requires chemical treatment to resist insects and decay.
5. Ferrocement
   • Thin cement-mortar panels reinforced with wire mesh.
   • High compressive strength (10–15 MPa), crack resistance, and water resistance.
   • Suitable for roofs, water tanks, and structural panels.

Experimental Findings

Compressive Strength

• Ferrocement achieved the highest compressive strength (10 MPa).
• Fly ash bricks reached 8 MPa, making them suitable for load-bearing walls.
• Stabilized mud blocks showed moderate strength (3–4 MPa).

Water Absorption

• Ferrocement had the lowest water absorption (7%), indicating excellent durability.
• Hollow concrete blocks also performed well (8%).
• Stabilized mud blocks had the highest absorption (20%) and require waterproofing.

Density

• Bamboo was the lightest material (700 kg/m³), ideal for lightweight roofing.
• Hollow concrete blocks were significantly lighter than conventional concrete.
• Ferrocement had the highest density (2000 kg/m³).

Thermal Insulation

• Stabilized mud blocks and bamboo provided the best thermal insulation, making them suitable for hot climates and reducing cooling energy demand.

Cost and Performance Analysis

• Fly ash bricks offered the best balance between strength and cost among masonry materials.
• Stabilized mud blocks were the cheapest walling material.
• Ferrocement was more expensive but justified by its superior strength and durability.
• Bamboo provided exceptional strength-to-cost performance for structural framing applications.

Environmental Benefits

• Fly ash bricks reduce industrial waste disposal.
• Stabilized mud blocks require significantly less energy than fired clay bricks.
• Bamboo is highly renewable and sequesters large amounts of carbon.
• Overall, these materials support sustainable and environmentally friendly construction.

Case Study

A 40 m² single-storey rural house was designed using a combination of:

• Fly ash bricks for walls,
• Bamboo for roofing components,
• Ferrocement panels for structural elements,
• Stabilized mud blocks where appropriate.

The low-cost design achieved a 35–38% reduction in construction cost compared to a conventional house built with fired bricks, RCC slabs, and steel framing.

Conclusion

Thisstudyevaluatedtheperformanceoffivelow-costhousingmaterialsthroughlaboratoryexperimentationandcomparative analysis. The principal findings are: 1) Hollowconcreteblocksofferlowwaterabsorption(8%),lightweightconstruction(1500kg/m3),andsuperiorthermal insulation (k = 0.5 W/mK), making them ideal for partition walls and infill panels. 2) Stabilised mud blocks are the most economical material (Rs.125/m2) and provide the best thermal insulation (k = 0.4 W/mK). Their limited water resistance requires waterproofing treatment in exposed locations. 3) Bambooisthelightestandmostrenewablematerialtested.Properlytreatedbambooperformswellinroofframingand fenestration, substantially reducing structural dead load. 4) Ferrocementprovidesthehighestcompressivestrength(10.0MPa)andthelowestwaterabsorption(7%),makingitthe most durable material and the preferred choice for roof panels and water tanks. 5) Thecombinationofflyashbrickwalls,hollowblockpartitions,andferrocementroofingachievesa3538%reductioninconstructioncostcomparedwithfullyconventionalconstruction,whilemeetingIScodestructuralrequirementsforlow-rise residential buildings.

References

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Copyright

Copyright © 2026 Rohit Kumar, Abhishek Kumar, Pankaj Kumar, Sheikh Ayyub, Zaffar Equbal, Prof. Shivani Singh Baghel. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.