Development of strength model of saw dust ash self compacting concrete

Abstract

The use of Response Surface Methodology (RSM) has significantly provided opportunity for adjustment during concrete production to avoid mistake and produce the required strength. Self-compacting concrete (SCC) offers numerous practical and economic benefits with good quality improvement in concrete constructions. The need to reduce challenges associated with cement making has been on the increase among the expertise globally, sawdust ash was used in the mix design to improve concrete properties and reduce the problem of poorly managed wastes by converting it to wealth. This paper presents the findings on the strengths of (SCC) containing Saw dust Ash (SDA) and development of strength prediction models of the concrete. The SDA used was obtained by incineration at 600 oC and sieved through 75 μm sieve. The compressive, splitting tensile and flexural strengths of (SDA-SCC) grade 40N/mm2 were investigated at replacement levels of 0, 5, 10, 15, 20, 25 and 30 %, respectively, at curing ages of 3, 7, 28, 56 and 90 days in accordance with standard procedures. The strengths of SDA-SCC were modeled using (RSM). The investigations showed that the strength properties of SCC decreased with increase in SDA content. However 5% SDA replacement was considered as optimum for structural concrete. The models of SDA-SCC for compressive, splitting tensile and flexural strengths were developed with R2 values of 0.9815, 0.9955 and 0.9968, respectively and is in good agreement with experimental results it confirm the validity of the proposed model and the model can be used to predict the strength of SDA-SCC.