Experimental Study on the Relationship Between Grouting Pressure and Compressive Strength of Hardened Cement Paste
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RESEARCH PAPER
Experimental Study on the Relationship Between Grouting Pressure and Compressive Strength of Hardened Cement Paste Xiaohui Ma1,2 · Lunchao Zhang1,3 · Jikai Zhou1 Received: 13 October 2018 / Accepted: 24 February 2020 © Shiraz University 2020
Abstract It is very difficult to predict the compressive strength of grouted hardened cement paste in the fracture areas when grouting technology is used for seepage prevention and reinforcement. In this paper, according to the Powers model of hardened cement paste, combined with indoor and field test data analysis, this study found that: (1) Under the condition that grouting pressure is zero, strength of hardened cement paste decreases with the increase of grout water cement ratio (W/C). Based on Powers model, the relation between grout strength of hardened cement paste and the ratio of paste mixing water is established; (2) The strength of grouting hardened cement paste in cracks increases with the increase of grouting pressure. The mechanism is that with the increase of grouting pressure, the real W/C of cement paste decreases, the paste is denser, as a consequence, the strength of grouting hardened cement paste is higher. (3) The calculation model of compressive strength and grouting pressure of grout hardened cement paste is established, and the compressive strength of grout hardened cement paste can be predicted according to grouting pressure and type of cement. The research results can provide the basis for the prediction and design of the compressive strength of grouting cement paste. Keywords Cement grouting · Hardened cement paste · Water-cement ratio · Powers model · Strength prediction model
1 Introduction Grouting technology is widely used in seepage prevention and reinforcement of civil engineering, such as hydraulic structure and underground engineering. Cement has the advantages of easy production, low cost and has little environmental impact. During the grouting construction, part of water in the cement paste injected into rock fracture by pressure seeps gradually along the cracks, and more and more cement particles are accumulated in the fracture area, * Jikai Zhou [email protected]; [email protected] Xiaohui Ma [email protected] Lunchao Zhang [email protected] 1
College of Civil and Transportation Engineering, Hohai University, Nanjing, China
2
Jiangsu Hehai Engineering Technology Co Ltd, Hohai University, Nanjing, China
3
School of Civil Engineering, Chuzhou Vocational and Technical College, Chuzhou, China
which will eventually fill the fracture area and it will be blocked by the cement paste. After the cement paste is hydrated and consolidated, the purpose of seepage prevention and reinforcement of rock fracture is achieved. The real w/c of cement paste in the fracture area is lower than that in the mixing paste, so that the hardened paste in the fracture area is denser and the compressive strength is higher (Chen et al. 2013; Lin and Christian 2009; Odler and Rößler 1985; Rabaiotti et al. 2015; Yudenfreund et al. 1
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