An experimental study of modified physical performance test of low-temperature epoxy grouting material for grouting join
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An experimental study of modified physical performance test of low-temperature epoxy grouting material for grouting joints with tenon and mortise Huifeng Su1,2
· Renzhuang Li1 · Ming Yang3
Received: 18 April 2020 / Accepted: 5 September 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract With the grouting material as focus, this study aims to guarantee that the joint with tenon and mortise constructing a metro station has the necessary waterproof performance, which shall not be poorer than the mechanical properties of the concrete with joints itself, and fine structural integrity. With groutability at low-temperature and available operational time as basis, low-temperature epoxy was selected as the grouting material for the joints. The silica powder of particular particle size and mass was added for modifying the physical performance of grouting material. A series of physical and mechanical tests were conducted in an attempt to achieve the optimal particle size and mix ratio provided that costs were reduced as practically as possible. Also, the flexural capacity of the joint filled with the above grouting material was demonstrated via the combined equal-proportion joint axial bend test. Keywords Joint with tenon and mortise · Low-temperature epoxy · Physical performance modification · Silica powder
Introduction Prefabrication is a construction method to prefabricate components in a plant and assemble them on site, which differs from the traditional field concrete pouring. The technique enjoys the advantages of controllable component quality, green and civilization construction, fast construction speed and little effect from seasonal changes (Chen et al. 2010; Hong et al. 2017; Dong et al. 2015; Mao et al. 2013; Liu and Ying 2009), etc. Prefabrication method has been widely used in surface buildings and structures. However, for undersurface construction with complicated internal force and high requirement for waterproof performance, the existing dry type connection appears weak in structural integrity and poor in waterproof performance (Shamass et al. 2014; Turmo et al.
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Huifeng Su [email protected]
1
Shandong University of Science and Technology, Qingdao 266590, China
2
Shandong Key Laboratory of Civil Engineering Disaster Prevention and Mitigation, Shandong University of Science and Technology, Qingdao 266590, China
3
Beijing Urban Construction Design and Development Group Co. Limited, Beijing 100037, China
2006), thus impeding the further development of prefabrication in subsurface construction. The Yuanjiadian Station of Changchun Metro Line 2 is scheduled to take a full prefabricated structure with verticalwall vault and column-free single arch. In this structure, a type of tenon and mortise joint with reserved space for later grouting is designed for the key circumferential and longitudinal joints. The tenon and mortise joint for grouting mainly consists of a tenon, mortise and a grouting hole, Grouting, As shown in Fig. 1a and b. the space between the mortis
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