Study on Optimization of Working Performance of Ultra High Performance Concrete

Wang Shengyu,Zhan Yijian,G Yang,M Ziegler

doi:10.1051/e3sconf/202019801005

Wang Shengyu, Zhan Yijian + Show 2 more

Open Access

https://doi.org/10.1051/e3sconf/202019801005

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Abstract

The water binder ratio is a key parameter in the mix design of ultra-high performance concrete. Aiming at the high sensitivity of ultra-high performance concrete to water consumption, the influence of water consumption on the performance of ultra-high performance concrete was studied in a narrow range. The compatibility ratio of raw materials of ultra-high performance concrete can be adjusted, but the space is small, so we try to improve the fluidity of concrete by physical and chemical means. The experimental results show that the fluidity of concrete increases slightly with the addition of glass beads, but the flexural properties of the concrete are adversely affected. With the addition of viscosity reducer, the workbility of concrete increases, but the compressive strength decreases.

Highlights

Ultra-high performance concrete (UHPC) is a kind of UHPC with excellent performance and good durability
Nano silica fume improves the particle size distribution of cementitious materials and makes the UHPC paste in a dense state, which serves as the main reason to explain why its strength is far higher than that of ordinary UHPC
The traditional strength design formula of Bowromi Water Binder Ratio was put forward when the ordinary concret is in the state of multi hole hardened mortar, so it is not suitable for UHPC paste whose hardened paste is in a dense state

Summary

Raw Materials for Experiment

The cement used in the experimentüP II 52.5 Portland cement, is produced by Anhui Conch Cement Co., Ltd.; the silica fumeüdensified silica fume, is produced by Shanghai Topken Silica Fume Co., LTD; the superplasticizer ü SQIIC803 polycarboxylate superplasticizer (retarding type) is produced by Shanghai Construction Building Materials Technology Group Co., Ltd., and its solid content is 22.57% and the water reduction rate of concrete is greater than or equals to 25%; high strength PVA fiber is made by Changzhou Tian Yi Engineering Fiber Co., Ltd., its basic properties are shown in Table 1. The microfilament steel fiber is provided by Shanghai Real Strong Fiber Co., Ltd., and the basic properties are shown in Table 2:

Microfilament steel fiber

Glass beads

Contents ratio in solid

Findings

Conclusions