TY  - EJOU
AU  - Wang, Aiguo 
AU  - Zheng, Yi 
AU  - Liu, Peng 
AU  - Zhao, Jun 
AU  - Liu, Kaiwei 
AU  - Wang, Yueming 
AU  - Sun, Daosheng 

TI  - Effect of air-cooled blast furnace slag aggregates on the autogenous shrinkage of concrete
T2  - ZKG International

PY  - 
VL  - 
IS  - 
SN  - 

AB  - Autogenous shrinkage is one of the primary factors leading to cracking in concrete structures. To enhance the efficiency of solid waste resource utilization, this study utilizes air-cooled blast furnace slag aggregates (ACBFSAs) to prepare concrete. The impact of different combinations of coarse and fine aggregates (NS-LCR, NS-SCR, SS-LCR, and SS-SCR) on the autogenous shrinkage of concrete is investigated. The experimental results indicate that the shape of the ACBFSAs is more irregular, and the surface of the aggregates is rougher. The 112 d autogenous shrinkage of the NS-LCR group reaches −195.4 μm/m. Replacing natural aggregates with ACBFSAs effectively reduces the autogenous shrinkage of concrete, and the SS-SCR group even exhibits micro expansion (55.8 μm/m). Owing to the internal curing effect induced by ACBFSAs, the concretes obtain higher internal relative humidity and smaller autogenous shrinkage. Its multi-angular characteristics and rough surface greatly increase the bonding strength between aggregate and the matrix. This study can provide technical support for the resource utilization of ACBFSAs in concrete.
KW  - Air-cooled blast furnace slag aggregate; morphological characteristics; autogenous shrinkage; shrinkage reduction mechanism

DO  - 10.32604/zkg.2025.074609