Abstract
Detailed research is carried out to ascertain the inhibitory effect of waste glass powder (WGP) on alkali-silica reaction (ASR) expansion induced by waste glass aggregate in this paper. The alkali reactivity of waste glass aggregate is examined by two methods in accordance with the China Test Code SL352-2006. The potential of WGP to control the ASR expansion is determined in terms of mean diameter, specific surface area, content of WGP and curing temperature. Two mathematical models are developed to estimate the inhibitory efficiency of WGP. These studies show that there is ASR risk with an ASR expansion rate over 0.2% when the sand contains more than 30% glass aggregate. However, WGP can effectively control the ASR expansion and inhibit the expansion rate induced by the glass aggregate to be under 0.1%. The two mathematical models have good simulation results, which can be used to evaluate the inhibitory effect of WGP on ASR risk.
Highlights
Since the 1980s, the use of waste glass (WG) in concrete has been investigated in USA and Europe
With regard to concrete production, WG can be used as fine aggregate to replace sand after being crushed or as a supplementary cementitious material to replace cement after being ground
Waste glass powder (WGP) can participate in pozzolanic reaction [6], which is beneficial to the properties of the binder
Summary
Since the 1980s, the use of waste glass (WG) in concrete has been investigated in USA and Europe. With regard to concrete production, WG can be used as fine aggregate to replace sand after being crushed or as a supplementary cementitious material to replace cement after being ground. In the former case, glass exhibits double effects on properties of concrete, both positive and negative. The glass can effectively reduce the porosity of concrete [2,3] so as to improve the strength [4] and durability [5] if its replacement ratio is below 20%–30% In the latter case, waste glass powder (WGP) can participate in pozzolanic reaction [6], which is beneficial to the properties of the binder. The micro properties are tested by scanning electron microscopy (SEM), which can be used to explain the ASR mechanism in depth
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