The Strength of Concrete with Rubber Wood Ash for Prefabricated Structure

Abstract

This research is focused on strength studies of concrete in terms of compressive, flexural, and tensile strength. In the current study, the rubber wood fly ash was used as a partial replacement for cement at the level of 10, 20, 30, and 40 percent by weight of the binder, and plastic waste aggregate was also used as a substitution for natural aggregates with 25 percent by volume of the total volume of the mixtures. The water by binder ratio was 0.5 and type F of superplasticizer was used for controlling slump and workability of concrete. The test of compressive strength, flexural strength and split tensile strength were followed by ASTM C 39, ASTM C 78 and ASTM C 496, respectively. The study reveals that the content the amount of rubber wood fly ash decreased the unit weight of concrete. There were in the range of 2,100 – 2,200 kg/m³. The compressive, flexural, and tensile strength of concreteat the curing age of 28 days were reduced as an increase in rubber wood fly ash content. The concrete mixture, although, with 20 percent of rubber wood fly ash presented the compressive strength value of 209 ksc which is in line with the design criteria of the department of public works and town & country planning of Thailand for concrete of prefabricated structures.