Experimental Investigation of Leca Different Volume Lightweight Aggregate Effect on the Mechanical Properties of Lightweight Concrete
Subject Areas : Analysis of Structure and Earthquake
Allahdad Ahmadi
1
,
babak Mansoori
2
1 - Author
2 - Meymand
Keywords: lightweight concrete, Leca, density, mix design, mechanical properties ,
Abstract :
In this paper, the mechanical properties of lightweight concrete (LWC) with Leca light grains were investigated. For this purpose, Concrete mixing designs LWC with different amount of Leca light grains (size 0-4 and 4-10 mm) were produced. Due to the high-water absorption Property of porous Leica Light aggregates in lightweight concrete, the ratio of water to cement (w / c) is not a criterion for the mixing design. In a number of mix schemes, a percentage of Leca light aggregate with sand (size 0-5 mm) was replaced. Strength parameters to identify the behavior of lightweight aggregate concrete (LWAC), include compressive and tensile strengths. For each mix of the Leca LWC, cubic samples with dimensions of 15 *15 *15 cm for finding compression strength and cylindrical specimens with dimensions of 30 *15 cm for achieving Tensile sstrength were prepared and cured and tested. Evaluation of compressive and tensile strength of samples at 28 days of age, which is the basis of structural design was performed. The results showed that in order to obtain lightweight structural concrete, a percentage of lightweight Leca aggregate should be replaced with sand. Due to the fact that increasing the sand increases the specific weight of concrete to keep the specific weight in the range of light concrete by increasing the amount of cement and micro silica and superplasticizer can reach the desired density. Also, by increasing the amount of adhesives using stone dust, micro silica and superplasticizer, the mechanical properties of lightweight concrete can be improved.
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