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Study on Mix Proportion Optimization of Manufactured Sand RPC and Design Method of Steel Fiber Content under Different Curing Methods

1
School of Economics and Management, Jilin Jianzhu University, Changchun 130000, China
2
School of Civil Engineering, Jilin Jianzhu University, Changchun 130000, China
3
School of Transportation Science and Engineering, Jilin Jianzhu University, Changchun 130000, China
*
Authors to whom correspondence should be addressed.
Materials 2019, 12(11), 1845; https://doi.org/10.3390/ma12111845
Received: 5 May 2019 / Revised: 27 May 2019 / Accepted: 3 June 2019 / Published: 6 June 2019
(This article belongs to the Special Issue Concrete and Construction Materials)
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Abstract

This study investigated four factors (water/binder ratio, silica fume, fly ash, and sand/binder ratio) using the orthogonal experimental design method to prepare the mix proportions of a manufactured sand reactive powder concrete (RPC) matrix to determine the optimal matrix mix proportions. On this basis, we assessed the compressive and splitting tensile strengths of different steel fiber contents under natural, standard, and compound curing conditions to develop an economical and reasonable RPC for various engineering requirements. A calculation method for the RPC strength of the steel fiber contents was evaluated. The results showed that the optimum steel fiber content for manufactured sand RPC is 4% under natural, standard, and compound curing conditions. Compared with standard curing, compound curing can improve the early strength of manufactured sand RPC but only has a small effect on the enhancement of late strength. Although the strength of natural curing is slightly lower than that of standard curing, it basically meets project requirements and is beneficial for practical applications. The calculation formula of 28-day compressive and splitting tensile strengths of manufactured sand RPC steel fiber at 0%–4% is proposed to meet the different engineering requirements and the flexible selection of steel fiber content. View Full-Text
Keywords: manufactured sand; compressive strength; splitting tensile strength; steel fiber contents manufactured sand; compressive strength; splitting tensile strength; steel fiber contents
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Zhong, C.; Liu, M.; Zhang, Y.; Wang, J. Study on Mix Proportion Optimization of Manufactured Sand RPC and Design Method of Steel Fiber Content under Different Curing Methods. Materials 2019, 12, 1845.

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