Study of Characteristic Physical and Mechanic of Foamed Lightweight Concrete with Fly Ash Added for Wall Materials

Habsya, Chundakus and Diharjo, Kuncoro and Setyono, Prabang and Satwiko, Prasasto (2018) Study of Characteristic Physical and Mechanic of Foamed Lightweight Concrete with Fly Ash Added for Wall Materials. International Journal of Recent Engineering Science (IJRES), 5 (1). pp. 27-33. ISSN 2349 – 7157

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Abstract

Selfweight of foamed lightweight concrete is lighter than normal concrete nor brick. Application of foamed lightweight concrete on the wall of hight rise building will decrease structural load. With lower structural load the structural dimension will significantly decrease and also construction cost. Utilization of fly ash waste as an added material of sand on lightweight concrete will reduce the negative impact of the environment and increase the strength of concrete. This study will examine the physical and mechanical characteristics of lightweight foam concrete for wall materials referring to the Indonesian National Standard (SNI). Comparison used 1 cement : 1 aggregate. Aggregates consist of sand and fly ash added material 0%, 15%, 30%, 45%, 60% and 75% by weight of sand. Cement water factor 0.35, and foam 30%, 40% and 50% of lightweight concrete volume. Cylinder sample dimension are 75 mm in diameters and 150 mm height. The number of test samples of compressive strength, water absorption, and specific gravity of 170 units. The results of research is density of the foamed lightweight concrete of 868.4 - 1582.4 kg / m3 fulfilled the criteria as lightweight concrete. The novelty of this research is the optimal compressive strength of various percentages of foam achieved at 45% fly ash. Foam with 30% has a compressive strength of 12.52 MPa fulfill the quality of I, foam with 40% has a compressive strength of 6.75 MPa fulfill the quality of III and foam with 50% has a compressive strength of 1.66 MPa does not fulfill the quality of SNI. The lowest water absorption is 5.12%, 8.35% and 15.97% fulfill the quality of I SNI at the 45% fly ash. Self weight of 1 m 2 wall of foamed lightweight concrete with a thickness of 120 mm 25.88% lighter than a half-brick brick wall with the same area.

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