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Abstract
With the rapid development of rail transit in China, the number and scale of underground engineering construction have increased significantly, and a large amount of shield muck has been generated, which has brought great challenges to the urban environment. The reuse of shield muck has become an important research direction in underground engineering construction. In this paper, a nonsintered brick is prepared with shield muck soil as the matrix. The influence of different doping amounts of lime, fly ash, cement, and polyvinyl alcohol on porosity, density, water absorption, saturation coefficient, compressive strength, and other properties was explored to realize the resource utilization of shield dregs and at the same time obtain excellent performance nonsintered bricks. Through research, it is found that when the lime doping amount is 10% and the cement doping amount is 5%, with the increase of the fly ash doping amount, the overall compressive strength increases significantly, and the maximum compressive strength can reach 13.69 MPa. Although the doping of trace amounts of polyvinyl alcohol reduces the compressive strength, it can significantly reduce the compressive strength and mass loss rate after 15 freeze‐thaw cycles.
Highlights
Introduction e rail transit construction ofChina is developing rapidly, and shield machines have been widely used as the main equipment for rail transit construction
It is found that all parameters of the prepared synchronous grouting material meet the requirements, which provides a basis for the feasibility of preparing the synchronous grouting material from the shield muck
When the lime content is 40%, the compressive strength reaches the lowest value of 3.19 MPa and increases. e reason is that when the lime content increases, the reaction releases a lot of heat and generates more CaCO3, which causes volume expansion, resulting in a large number of pores, even microcracks, and the strength decreases
Summary
Introduction e rail transit construction ofChina is developing rapidly, and shield machines have been widely used as the main equipment for rail transit construction. Shield muck can be used as building materials to prepare building materials including synchronous grouting materials, high-performance ceramsites, and functional bricks (permeable bricks, pavement bricks, and sintered bricks) [4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26]. The shield tunnel muck has been studied in grouting materials and high-performance ceramsite, it is more advantageous to prepare functional bricks from shield tunnel muck in terms of utilization rate and utilization effect. Organic doping can improve the overall performance of the material. erefore, this article researched nonsintered bricks with shield muck as the matrix, inorganic cementing materials as auxiliary materials, and trace organic doping
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