Abstract
The application of organic lightweight aggregates (LWA) such as rice husk, coconut shell and oil palm shell in concrete are gaining popularity. However, organic substances are generally flammable under elevated temperature. As such, it is important to understand the strength performance of concrete with organic LWA under elevated temperature. To this end, this paper presents the compressive strength and mass loss of lightweight self-compacting concrete (LWSCC) when exposed to elevated temperature. In the research, comparison was made between the LWSCC samples of the control mix and mix with 40% of fly ash replacement. The compressive strengths of these mixes at 28-day were 31.35 MPa and 22.77 MPa respectively while at 90-day age, they were 33.27 MPa and 25.04 MPa respectively. Compressive strength of LWSCC samples were studied experimentally under different temperature of 26°C (room temperature), 100°C, 200°C and 300°C respectively. The experimental results showed that there is significant reduction in concrete compressive strength within the temperature range of 100°C- 200°C. When temperature was increased to 300°C, the concrete experienced strength reduction of nearly 84% and 79% at 28-day and 90-day age respectively for control mix. When 40% fly ash is incorporated, the concrete experienced strength reduction of nearly 72% and 66% at 28-day and 90-day age respectively.
Highlights
Concrete is regarded as one of the common materials in construction industry
This paper presents the compressive strength and mass loss of lightweight self-compacting concrete (LWSCC) when exposed to elevated temperature
The slump flows of these two mixes were within the range of 550-850mm which complied with the requirement of European guidelines (EGSCC, 2005)
Summary
Concrete is regarded as one of the common materials in construction industry. Its use became rare after the Roman Empire had collapsed. It was only until the middle of the eighteenth century that concrete technology started to re-develop. One of the notable one is the self-compacting concrete (SCC). In the late 1980s, self-compacting concrete (SCC) was developed in Japan.SCC possesses the ability to flow under its own weight, filling the formwork with complex geometry, and the region of congested reinforcement more compactly and it eliminates the necessity of external vibration (EGSCC, 2005; Okamura & Ouchi, 2003). Supplementary cementitious materials can be incorporated in concrete in order to reduce the material cost. Fly ash is one of the most common supplementary cementitious
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