Abstract
The aim of this paper is to investigate the effect of superabsorbent polymers (SAPs) on the drying shrinkage of the recycled concrete (RC). The natural aggregate (NA) was replaced by recycled aggregate at three replacement ratios (0%, 50%, and 100%). Then, the recycled concrete (RC) with different SAP contents was prepared. The performance of recycled concrete with different SAP content was analyzed with slump test, compressive strength test, and drying shrinkage test. GM (1, N) grey prediction model was utilized to predict the drying shrinkage of recycled concrete containing SAP. The results show that the strength and durability of concrete are decreased by the addition of recycled aggregate. With the increase of the dosage of SAP, the strength and durability also raise. The prediction GM (1, N) model for the drying shrinkage of recycled concrete with SAP is in good agreement with the actual drying shrinkage.
Highlights
Due to low cost, convenience, simple production process, and excellent mechanical and durability properties, natural concrete (NC) materials are widely utilized in building construction, road engineering, and bridge engineering [1,2,3,4]
Recycled aggregate is composed of natural aggregate and old mortar. ere are a lot of pores in the old mortar and interfacial transition zone (ITZ). erefore, RA showed higher porosity and water absorption compared with natural aggregate [11]
When the superabsorbent polymers (SAPs) content is 0%, the slump and expansion of concretes decrease with the increase of the replacement proportion of RA. is is because the RA contained many inherent defects and microcracks and was covered by old mortar. e old mortar causes the increase of water absorption of RA and reduces the slump and expansion of recycled concrete
Summary
Convenience, simple production process, and excellent mechanical and durability properties, natural concrete (NC) materials are widely utilized in building construction, road engineering, and bridge engineering [1,2,3,4]. Is has consumed the amount of natural rock of nonrenewable resources and caused the higher price of natural aggregates. Many studies have shown that the utilization of recycled coarse aggregate to prepare cement concrete saves 60% natural aggregate resource and consumes a large amount of CDW and reduces 20% emission of CO2 [9, 10]. Replacing natural aggregates with recycled aggregates will result in a decrease in the durability of concrete. Recycled aggregate is composed of natural aggregate and old mortar. Concrete made of RA is easy to shrink and crack, resulting in the insufficient durability of concrete
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