A kind of fast-setting impact-resistant composite thin plate and its preparation method

Abstract

The invention discloses a new fast-setting and impact-resistant composite thin plate, which is formed by filling phosphate-based fast-hardening gelling powder into multi-layer fiber fabrics and spraying water to solidify them; wherein the multi-layer fiber fabrics include surface fiber fabrics, middle layers Fiber fabric and underlying fiber fabric. The present invention optimizes the formulation system and fiber fabric structure of phosphate-based rapid-hardening gelling powder, and has the advantages of convenient portability, simple operation, rapid strength development, excellent impact resistance, etc., and the preparation method involved is simple, and can be used in emergency It has a good application prospect in the field of protection, emergency reinforcement and military special protection engineering.

Description

technical field [0001] The invention belongs to the technical field of building materials, in particular to a fast-setting impact-resistant composite sheet and a preparation method thereof. Background technique [0002] As we all know, fast-setting and fast-hardening cementitious materials have fast setting speed, high early strength and good durability, so they have broad application prospects in engineering fields such as bridge structure reinforcement and road repair. However, since hardened cementitious materials usually exhibit significant brittleness, cracks are prone to occur and rapidly propagate under impact, eventually leading to the failure of the overall material / structure. Therefore, to effectively improve the inherent defect of the brittleness of fast-setting and fast-hardening cementitious materials, optimize the overall anti-crack propagation ability of the material, and improve the material's ability to absorb impact energy, it is to promote the preparation ...

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Problems solved by technology

[0005] However, the current research on concrete canvas matrix materials is more limited to Portland cement and sulphoaluminate cement. In general, the components of raw materials are relatively single, the optimal design for the matrix is ​​not sufficient, and the utilization rate of materials needs to be improved. ; and the conventional concrete canvas still has problems such as slow setting speed (about 30min or more), low strength level (3 hours strength does not exceed 40MPa), unstable performance in the later stage (there are phenomena such as late strength shrinkage, shrinkage cracking, etc.); Most of the existing optimization schemes based on phosphate rapid hardening and rapid hardening gelation systems consider the influence of a single factor, resulting in low early strength (the 3h strength basically does not exceed 40MPa), which cannot meet the high requirements of rapid setting and rapid hardening. And due to the existence of the spacer yarn in the three-dimensional spacer fabric, the application of the phosphate system to the concrete canvas still has the problem of sample collapse after water spraying and is not suitable for molding. Therefore, it can be considered to improve the combination of the cementitious material and the fiber.

[0006] The technical bottlenecks faced by the above-mentioned concrete canvas limit its effective application in related emergency protection and engineering repairs. Therefore, it is important to further explore and optimize new composite thin plates with properties such as rapid setting, rapid hardening, and impact resistance. and promotion

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