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Effect of Modification and Replacement Rate of Recycled Coarse Aggregate on Properties of Recycled Aggregate Concrete
The modification method and the replacement rate of recycled coarse aggregate (RCA) have a great influence on the properties of recycled aggregate concrete (RAC). This paper aims to study the properties of RAC changes with the replacement rate and analyze the modification mechanism. Composite impregnation treatment was carried out for RCA using sodium silicate solution and silane slurry, and the influence of modifier on apparent density, crushing index, and water absorption of RCA was determined. RCA was incorporated in ordinary concrete by replacing natural aggregate at the replacement rates of 0, 20, 40, 60, 80, and 100% by weight. Compressive strength (CS), splitting tensile strength, and water absorption of pervious RAC containing RCA were determined. The surface change of modified RCA was analyzed by scanning electron microscopy. The results indicate that the modification method can improve the properties of RCA effectively. The water absorption of modified RCA decreases most significantly, reaching 52.8%. The properties of RAC decreased with the increase in replacement rate (RR). When the replacement rate was greater than 40%, the properties of RAC changed significantly. The micro-analysis shows that silane and sodium silicate can fill the microcracks and holes on surface of RCA, which strengthens the compactness of old mortar on surface of RCA and improves the properties of RAC.
Effect of Modification and Replacement Rate of Recycled Coarse Aggregate on Properties of Recycled Aggregate Concrete
The modification method and the replacement rate of recycled coarse aggregate (RCA) have a great influence on the properties of recycled aggregate concrete (RAC). This paper aims to study the properties of RAC changes with the replacement rate and analyze the modification mechanism. Composite impregnation treatment was carried out for RCA using sodium silicate solution and silane slurry, and the influence of modifier on apparent density, crushing index, and water absorption of RCA was determined. RCA was incorporated in ordinary concrete by replacing natural aggregate at the replacement rates of 0, 20, 40, 60, 80, and 100% by weight. Compressive strength (CS), splitting tensile strength, and water absorption of pervious RAC containing RCA were determined. The surface change of modified RCA was analyzed by scanning electron microscopy. The results indicate that the modification method can improve the properties of RCA effectively. The water absorption of modified RCA decreases most significantly, reaching 52.8%. The properties of RAC decreased with the increase in replacement rate (RR). When the replacement rate was greater than 40%, the properties of RAC changed significantly. The micro-analysis shows that silane and sodium silicate can fill the microcracks and holes on surface of RCA, which strengthens the compactness of old mortar on surface of RCA and improves the properties of RAC.
Effect of Modification and Replacement Rate of Recycled Coarse Aggregate on Properties of Recycled Aggregate Concrete
Iran J Sci Technol Trans Civ Eng
Li, Jie (author) / Chen, Long-Long (author) / Wang, Zhi-Feng (author) / Wang, Ya-Qiong (author)
2023-12-01
12 pages
Article (Journal)
Electronic Resource
English
| European Patent Office | 2022
Effect of recycled coarse aggregate on damage of recycled concrete
| Springer Verlag | 2011