Effect of Mineral Viscosity Reducer on Rheological, Mechanical Properties and Durability of Recycled Aggregate Concrete

doi:10.16552/j.cnki.issn1001-1625.2024.1188

Abstract

Abstract: In order to improve the working properties of recycled aggregate concrete (RAC), the effects of the amounts of homemade mineral viscosity reducer (VR) (8%, 10% and 12% of cement replaced by equal mass) on the rheological properties, strength, durability and shrinkage properties of RAC were investigated. The microstructure of RAC was also analyzed using scanning electron microscopy. The results show that the rheological properties of RAC improve with the increase of VR amount, the plastic viscosity of the paste decreases by 32.8% at 12% of VR amount, the yield stress and plastic viscosity of the mortar decrease by 42.0% and 17.9%, the slump and slump flow increase by 50, 40 mm, and the emptying time of inverted slump cylinder is shortened by 65.7%. At the same time, the VR incorporation makes the microstructure of the paste and interface transition zone of RAC become dense, which has a good improvement effect on the strength and durability of RAC. The best improvement is achieved when the VR is incorporated at a amount of 10%, with the 28 d compressive strength and splitting tensile strength of RAC increasing by 7.6% and 17.2%, the water absorption decreasing by 22.6%, and the electric flux and carbonation coefficient decreasing by 47.9% and 29.9%, respectively. In addition, the VR slightly reduces the drying shrinkage of RAC, but increases its early autogenous shrinkage to some extent.

Key words: recycled aggregate concrete, mineral viscosity reducer, rheological property, mechanical property, durability

CLC Number:

TU528

HUANG Liang, LI Beixing, YANG Yucheng, TIAN Shenhua. Effect of Mineral Viscosity Reducer on Rheological, Mechanical Properties and Durability of Recycled Aggregate Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(4): 1458-1467.

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