Abstract
Alkali-activated slag (AAS) is an environmentally friendly green cementitious material that can replace ordinary Portland cement (OPC) and has attracted extensive research by scholars all over the world. However, research regarding its creep performance has been lacking, which in turn affects its further application. The creep of alkali-activated slag concrete is large, and fiber addition has been shown to improve this problem. Polypropylene (PP) fiber has good alkali resistance and is economical. This paper studies the effect of the stress–strength ratio and fiber length on the creep property of PP fiber-reinforced alkali-activated slag (FRAAS) concrete. At the stress–strength ratio of 0.15, PP fiber addition is able to greatly reduce the creep of concrete. When the stress–strength ratio increases, the shorter fiber loses the anchoring force and the holes caused by the longer fiber crack. This in turn leads to the deterioration of the inhibition effect on concrete creep. The CEB-FIP 2010 model is highly accurate, but the final value prediction is small. The early prediction value of the GL2000 model is rather large and conservative. The creep coefficient of the prediction model and the measured secant modulus of PP FRAAS concrete with different fiber lengths under different stress–strength ratios may solve the issue of creep prediction.
Highlights
Accepted: 13 January 2022Carbon dioxide emissions are severely threatening the existence and survival of both the earth and humankind
With respect to the fiber volume ratio of 0.6%, this paper studies the creep properties of PP fiber-reinforced alkali-activated slag (FRAAS) concrete with three different lengths (6 mm, 12 mm, and 18 mm) of PP fiber at the stress–strength ratio of 0.15–0.6
The stress-dependent strain consists of two parts: the first is the instantaneous deformation at the time of loading, while the other is the creep deformation at the time of load holding
Summary
Accepted: 13 January 2022Carbon dioxide emissions are severely threatening the existence and survival of both the earth and humankind. The world is attempting to reduce carbon dioxide emissions. China is currently striving to peak its carbon dioxide emissions by 2030 and achieve carbon neutrality by 2060. Cement is the most commonly used building material. The carbon dioxide produced by cement production accounts for 8% of the total global carbon dioxide emission each year [1]. If there were to be a cementitious material that could replace cement, carbon dioxide emissions could be greatly reduced. Steel is a widely used material in construction projects. In the production process of steel, a large amount of waste is unavoidably produced. This is referred to as the granulated blast furnace slag. The wastes in question are often stacked in open air, in turn causing environmental pollution
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