Study on the performance of alkali-activated no-slump recycled concrete prepared by limestone sand
LIANG Haibo
JIANG Yingchun
WEI Zhaohe
MAO Qisong
YUE Gongbing
WANG Xinyan
Abstract：The experiment used alkali-activated cementitious materials to replace cement,limestone sand to replace river sand,and recycled coarse aggregate to replace natural aggregate to prepare alkali-activated no-slump recycled concrete(AANSRC),and systematically studied the effects of cementitious material dosage and alkali concentration on the water consumption,sol ratio,and compressive strength of concrete and established the linear correlation between 28 d compressive strength,cementitious material dosage and sol ratio.The results show that to maintain the working workability of concrete mixtures,the water consumption of AANSRC increases with the increase of cementitious material content and alkali concentration.When the cementitious material content is 500 kg/m3 and the alkali concentration is 5.0％,AANSRC has excellent mechanical properties and fast hardening and early strength effect.Its 28 d compressive strength can reach 48.10 MPa,and its 3 d compressive strength can reach 70.0％of 28 d compressive strength.The established regression equation shows a significant correlation.Based on this,optimized the mix proportion of AANSRC with different strength levels.
Keywords：alkali-activatedlimestone sandno-slump concreteworkabilitymechanical propertycorrelation
Publication Date：2025-04-25
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 34-37,54 )