Effect of Mix Proportion Parameters on Behaviors of Basalt Fiber RPC Based on Box-Behnken Model

Hanbing Liu,Shurong Wang,Shiqi Liu,Yafeng Gong,Xin Gao

doi:10.3390/app9102031

Abstract

Basalt fibers are widely used in the modification of concrete materials due to its excellent mechanical properties and corrosion resistance. In this study, the basalt fibers were used to modify reactive powder concrete (RPC). The effect of four mix proportion parameters on the working and mechanical properties of basalt fiber reactive powder concrete (BFRPC) was evaluated by the response surface methodology (RSM). The fluidity, flexural and compressive strength were tested and evaluated. A statistically experimental model indicated that D (the silica fume to cement ratio) was the key of interactions between factors, affecting other factors and controlling properties of BFRPC. The increase in basalt fiber content had a remarkable effect on increasing the flexural and compressive strength when D = 0.2. The addition of basalt fiber obviously improved the mechanical properties of RPC. While when D = 0.4, the decrease of fiber content and the increase of quartz sand content could increase the compressive strength.

Highlights

Reactive powder concrete (RPC) is a class of high performance concrete characterized by high strength, long durability and good stability, which was developed in the 1990s [1]
The accuracy of the regression model and the significance of influencing factors were tested by an analysis of variance (ANOVA)
The effects of four process parameters (sand/binder ratio (A), water/binder ratio (B), basalt fiber content (C), silica fume to cement ratio(D)) on the fluidity, compressive strength and flexural strength of basalt fiber reactive powder concrete (BFRPC) were investigated by the Box-Behnken Design (BBD) experimental design method, the following conclusions can be drawn: (1) Three calculation models of fluidity, flexural strength and compressive strength were established through the Box-Behnken method

Summary

Introduction

Reactive powder concrete (RPC) is a class of high performance concrete characterized by high strength, long durability and good stability, which was developed in the 1990s [1]. It is characterized by eliminating coarse aggregate to improve matrix homogeneity and optimizing mixture particle gradation to enhance matrix compactness. Silicon-containing materials such as silica fume and fly ash are usually added into RPC as active components. The compressive strength of RPC can reach 200–800 MPa, which has superior mechanical properties compared with traditional concrete materials. Fibers are usually added to reinforce the toughness [4]

Objectives

Methods

Results

Conclusion