Abstract
Mud is a versatile material with a prodigious interest for traditional wall construction such as wattle and daub or rammed earth, with and without reinforcements. Mud concrete has been identified as a unique modern material, though more research is required for generalization. Compressive strength, a measure of concrete quality usually depends on the specimen’s size and shape. Specimen’s size and shape for mud concrete is yet to be identified and established. Addressing this knowledge gap, this research aims at investigating the effect of specimen’s size and shape on the compressive strength of mud concrete. At first, the compressive strength’s variation was estimated by varying water content. Then, the water content was kept constant and the variations of compressive strength were estimated by varying specimen size and shape. Both experiments were conducted for different mixtures and percentages of cement. The initial results suggest that the compressive strength of mud concrete decreases with the increase of water content. The decrease indicated linear behavior with a constant gradient. Less influence on compressive strength was observed by considering specimen size, while the shape showed more contribution. The effect of specimen size and shape was increased with the increase of compressive strength.
Highlights
Mud concrete is a modern composite material made out of soil consisting of gravel, sand (0.425mm≤sand≤4.75mm) and fine particle (≤0.425mm) in different compositions, which is composed of elements that have various strengths for different applications such as walling material, paving blocks etc., with various cement percentages and types [1, 2]
The results indicate that the increase in water content causes a linear decrease in compressive strength at a constant rate
The compressive strength test results were recalculated to a common moisture content value, as the compressive strength shows a drastically change with the moisture content with the results obtained in Step 1
Summary
Mud concrete is a modern composite material made out of soil consisting of gravel (sieve size: 4.75mm≤gravel≤20mm), sand (0.425mm≤sand≤4.75mm) and fine particle (≤0.425mm) in different compositions, which is composed of elements that have various strengths for different applications such as walling material, paving blocks etc., with various cement percentages and types [1, 2]. Previous studies can be found on the effect of size and shape for conventional cement concrete and cement concrete with several other constituents such as glass fiber, admixtures, etc. Literature testifies that hardening mechanical properties of mud concrete in different proportions are dissimilar to cement concrete, different size and shape effects can be expected. The effects of specimen’s shape and size on the compressive strength of mud concrete are, to the best of our knowledge, not yet studied
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