Assessment of coarse basalt aggregate in ultra-high performance concrete (UHPC)

Conference Contribution

Yu, Q.L., Li, P.P. & Brouwers, H.J.H. (2018). Assessment of coarse basalt aggregate in ultra-high performance concrete (UHPC). Proceedings of the 2nd International Conference on UHPC Materials and Structures UHPC 2018 - China (pp. 171-179). Chonging: RILEM Publications.

Abstract

 

In the present research, UHPCs applying coarse basalt aggregate are designed by using the particle packing theory and optimal mineral proportion. The mineralogical composition effect, basalt aggregate size effect and powder content effect were analyzed and discussed, based on
the workability and compressive strength of the designed UPHC. The results show that the optimal proportion of powder is 5% of micro-silica and 20% of limestone powder by the weight of powder. The coarse basalt aggregate has a rather limited influence on the mechanical strength of UHPC, and a slight decreasing trend is observed with the increase of
maximum size of basalt aggregate. The optimal powder content of UHPC is about 800 kg/m3 at the maximum size of basalt aggregate of 8 mm. The increase ratios of the compressive and tensile splitting strengths of UHPC with different powder amounts by 2% of steel fiber are
between 13% and 19%, 95%, and 110%, respectively.