Effect of sand and lime on physical and mechanical properties of autoclaved aerated concrete.

Autoclaved aerated concrete is one kind of lightweight concrete with numerous advantages compared to the conventional concrete when consider the strength to weight ratio. This study covers the variation of physical and mechanical properties of AAC with different FM value of sand and lime content and comparison these properties with that of normal weight cement block. To fulfill the research work total eight different sets of samples with various sand types and lime content were casted. Sand with four different FM of 2.65, 2.25, 1.75, 1.25 was mixed with Ordinary Portland Cement along with two different lime content. From this study, the AAC block having sand with 1.25 FM and 20% lime exerted 29.19% weight reduction compared with the normal weight concrete. However, AAC block having sand of 2.65 FM and 10% lime exhibits the maximum compressive and tensile strength when compared to other sets of samples except the controlled one. For this set, the compressive and tensile strength after 7days was 22.60 MPa and 2.06 MPa respectively and after 56days was 25.94 MPa and 2.30 MPa respectively and both 7 and 56 days' strengths are quite less than that of normal weight concrete or controlled block. The increased volume was maximum for the set of AAC having sand 2.65 FM and 20% lime and the increase in volume for this set is 13.85%. The surface absorption and water absorption of AAC was increased with lime content and decreasing of FM value of sand. The value of water absorption of the set of AAC with 1.25 FM and 20% lime was 11.10%. The absorption capacity of autoclaved aerated concrete was greater than that of normal weight concrete. [ABSTRACT FROM AUTHOR]

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