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Related Experiment Video

Updated: Aug 15, 2025

Production and Analysis of Sporosarcina pasteurii Biocement Bricks Using Custom 3D-Printed Molds for Unconfined Compression Tests

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Geopolymer Concrete with Lightweight Fine Aggregate: Material Performance and Structural Application.

Osama Youssf¹, Julie E Mills², Mohamed Elchalakani³

¹Structural Engineering Department, Faculty of Engineering, Mansoura University, Mansoura 35516, Egypt.

|January 8, 2023

Summary

This study evaluated lightweight fine aggregates (rubber, vermiculite, LECA) in geopolymer concrete (GC). LECA enhanced compressive strength, while rubber showed promise for impact and flexural loads.

Keywords:

LECA lightweight geopolymer concrete reinforced slab bending rubber vermiculite

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Area of Science:

Materials Science
Civil Engineering
Concrete Technology

Background:

Limited data exists on the performance of geopolymer concrete (GC) with lightweight fine aggregates.
Investigating alternative materials for sand replacement in GC is crucial for sustainable construction.

Purpose of the Study:

To evaluate the impact of rubber, vermiculite, and lightweight expanded clay aggregate (LECA) as partial sand replacements in GC.
To determine the material and structural performance of GC incorporating these lightweight fine aggregates.
To recommend suitable GC mixes for various structural applications.

Main Methods:

Three lightweight fine materials (rubber, vermiculite, LECA) were used to replace sand in GC at 20%, 40%, 60%, and 100% by volume.
Properties measured included workability, compressive strength, indirect tensile strength, freezing/thawing resistance, and impact resistance.
Three reinforced concrete slabs were tested under a 4-point bending load.

Main Results:

Lightweight expanded clay aggregate (LECA) significantly increased compressive strength at all replacement levels.
Partial or full sand replacement negatively impacted shear resistance and slab performance.
Slab strength and deflection decreased with rubber (9%, 30%) and LECA (23%, 59%).

Conclusions:

Geopolymer concrete (GC) with 60% LECA is suitable for structures under axial loads.
Rubber is recommended as the best lightweight material for resisting impact and flexural loads.
Further research is needed to optimize GC mixes with lightweight aggregates for enhanced structural applications.