AUTHOR=Ji Jing , Kang Wei , Jiang Liangqin , Li Yunhao , Ren Hongguo , Hao Sixue , He Lingjie , Lin Yubo , Yu Chenyu 

TITLE=Mechanical Behavior of Reactive Powder Concrete Made From Local Material Subjected to Axial Pressure

JOURNAL=Frontiers in Materials

VOLUME=8

YEAR=2021

URL=https://www.frontiersin.org/journals/materials/articles/10.3389/fmats.2021.737646

DOI=10.3389/fmats.2021.737646

ISSN=2296-8016

ABSTRACT=<p>In order to investigate the influence of various parameters on the compressive strength and fluidity of reactive powder concrete (RPC) made from local materials, 22 groups of RPC cubic specimens and 3 groups of RPC prism specimens were designed, and the main parameters included water to binder ratio, the ratio of silica fume to cement, the ratio of slag powder to cement, the ratio of quartz sand to cement, volume fraction of steel fiber, and steam curing time. The stress-strain curves and failure mode of RPC cubic specimens were obtained by the axial compression test. The influence of various parameters on the compressive mechanical properties and the mixture fluidity of RPC cubic specimens was analyzed. The results showed that the ultimate compressive strength (<italic>f</italic><sub>cu</sub>) of RPC gradually decreases with the increase in the water to binder ratio; however, <italic>f</italic><sub>c<bold>u</bold></sub> increases with the increase in the volume fraction of steel fiber. <italic>f</italic><sub>cu</sub> increases firstly and then decreases with the increase in the ratio of silica fume to cement, the ratio of slag powder to cement, and the ratio of quartz sand to cement, so there exists a peak point. The fluidity of RPC mixture increases with the increase in the water to binder ratio and the ratio of slag powder to cement; on the contrary, it decreases with the increase in the ratio of silica fume to cement, the ratio of quartz sand to cement, and volume fraction of steel fiber. Based on the analysis of the parameters, the optimal mix proportion of the RPC made from local materials is proposed. The constitutive model of RPC is established according to the stress-strain curves of RPC prism specimens. Finally, the relationship between compressive strength and elastic modulus of RPC made of local materials is regressed statistically.</p>