Abstract
High volume fly ash concrete becomes one of alternatives to produce green concrete as it uses waste material and significantly reduces the utilization of Portland cement in concrete production. Although using less cement, its compressive strength is comparable to ordinary Portland cement (hereafter OPC) and the its durability increases significantly. This paper reports investigation on the effect of design strength, fly ash content and curing method on compressive strength of High Volume Fly Ash Concrete. The experiment and data analysis were prepared using minitab, a statistic software for design of experimental. The specimens were concrete cylinder with diameter of 15 cm and height of 30 cm, tested for its compressive strength at 56 days. The result of the research demonstrates that high volume fly ash concrete can produce comparable compressive strength which meets the strength of OPC design strength especially for high strength concrete. In addition, the best mix proportion to achieve the design strength is the combination of high strength concrete and 50% content of fly ash. Moreover, the use of spraying method for curing method of concrete on site is still recommended as it would not significantly reduce the compressive strength result.
Highlights
Concrete, composed of cement, aggregate, water and optional admixture, is the main material for construction and its consumption becomes a second large material of human use after water [1, 2]
This research employed experimental program to analyse the effects of design strength, fly ash content and curing method on compressive strength of high volume fly ash concrete
The fly ash which is used in this experiment was produced by PLTU Tanjung Jati Jepara, Central Java and the chemical content analysis was conducted at Laboratorium Pengujian dan Kalibrasi BARISTAND, Surabaya, East Java
Summary
Concrete, composed of cement, aggregate, water and optional admixture, is the main material for construction and its consumption becomes a second large material of human use after water [1, 2]. The curing regime becomes a factor which gives effect to the compressive strength result of high volume fly ash concrete based on comparison of water immersing and steam curing method [16]. It can be noted that the design strength, the amount of cement replacement and the curing method becomes influential factors which can give effects to compressive strength of high volume fly ash concrete. This research employed experimental program to analyse the effects of design strength, fly ash content and curing method on compressive strength of high volume fly ash concrete. Similar to the mix proportion of normal design strength, high strength concrete used 537 kg of total binder which was proportionally distributed to Portland cement and fly ash. At the age of 56 days, the specimens were tested for its compressive strength
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