Open Access

Zhitian Xie¹, Yanzhen Xiao², Xiaokai Niu¹, Wei Song¹, Xinru Sun², Xiao Liu^2,*, Shicheng Liu¹, Yanxi Li², Ziming Wang², Suping Cui²
ZKG International, DOI:10.32604/zkg.2026.075210
Abstract Sprayed concrete is widely used in tunnel support and structural repair, but the direct addition of conventional viscosity-modifying agents often causes pipeline blockage and competitive adsorption with polycarboxylate superplasticizers, which leads to poor workability and high rebound rates. To overcome these practical problems, this study designs a mechanically triggered core–shell HPMC-40000 thickening agent (HPMC @ SiO₂-TA) that can increase the instantaneous viscosity of mortar only when the material impacts the sprayed surface. The improvement effect of HPMC @ SiO₂-TA on the performance of sprayed mortar was evaluated by apparent viscosity property, mechanical properties, bounce rate tests.… More >

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Open Access

Aiguo Wang¹, Yi Zheng¹, Peng Liu^2,*, Jun Zhao¹, Kaiwei Liu¹, Yueming Wang¹, Daosheng Sun^1,*
ZKG International, DOI:10.32604/zkg.2025.074609
Abstract 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 More >

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