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Compressive strength and drying shrinkage of concrete containing fine recycled concrete aggregates

By: Contributor(s): Publication details: Thane ACC LTD 2024Edition: Vol.98(1), JanDescription: 18-26pSubject(s): Online resources: In: Indian Concrete Journal - ICJSummary: The experimental research examines the production of laboratory concrete by replacing natural fine aggregates with recycled fine aggregates. The main aim of this work is to determine the compressive strength and drying shrinkage of ordinary Portland cement (OPC) concrete using fine recycled concrete aggregates (FRCA) and natural coarse aggregates (NA) with various water cement ratios (0.70, 0.63 and 0.57). For this purpose, three (3) series of concrete specimens are cast and analysed. For each series, five (5) replacement levels (0, 25, 50, 75 and 100 %) are adopted. All concrete specimens have been cured until the day of testing, except for the drying shrinkage specimens which have been cured for 7 days. All mixtures are designed with natural and recycled fine aggregates. However, natural coarse aggregates have been used in all cases. FRCA is obtained from crushed concrete using a jaw crusher. The effects of FRCA content on the compressive strength and drying shrinkage of concrete are determined and compared with the control concrete. It can be stated that the evolution of compressive strength is similar to that of the control concrete. However, the results of drying shrinkage after a period of 28 days revealed that the replacement percentage is a significant factor in recycled aggregates present within the mixture. The drying shrinkage in the recycled concrete with substitution levels lower than 50 % is similar to the control concrete. However, when 100 % fine natural aggregates are replaced with fine recycled concrete aggregates, there is a 30-50 % increase in drying shrinkage as compared to what is experienced by the control concrete.
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The experimental research examines the production of laboratory concrete by replacing natural fine aggregates with recycled fine aggregates. The main aim of this work is to determine the compressive strength and drying shrinkage of ordinary Portland cement (OPC) concrete using fine recycled concrete aggregates (FRCA) and natural coarse aggregates (NA) with various water cement ratios (0.70, 0.63 and 0.57). For this purpose, three (3) series of concrete specimens are cast and analysed. For each series, five (5) replacement levels (0, 25, 50, 75 and 100 %) are adopted. All concrete specimens have been cured until the day of testing, except for the drying shrinkage specimens which have been cured for 7 days. All mixtures are designed with natural and recycled fine aggregates. However, natural coarse aggregates have been used in all cases. FRCA is obtained from crushed concrete using a jaw crusher. The effects of FRCA content on the compressive strength and drying shrinkage of concrete are determined and compared with the control concrete. It can be stated that the evolution of compressive strength is similar to that of the control concrete. However, the results of drying shrinkage after a period of 28 days revealed that the replacement percentage is a significant factor in recycled aggregates present within the mixture. The drying shrinkage in the recycled concrete with substitution levels lower than 50 % is similar to the control concrete. However, when 100 % fine natural aggregates are replaced with fine recycled concrete aggregates, there is a 30-50 % increase in drying shrinkage as compared to what is experienced by the control concrete.

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