Super-tough concrete for prefabricated members and preparation method of super-tough concrete

A technology of prefabricated components and super toughness, applied in the field of concrete, can solve the problems of reduced compressive strength, high cost, and reduced elastic modulus, and achieve the effect of improving structural safety and low price

Pending Publication Date: 2021-05-28
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional way to improve the brittleness of concrete is mainly to increase the tensile strength and ultimate tensile strain of concrete or mortar, reduce the elastic modulus and shrinkage deformation, etc., such as adding flexible fibers, rubber particles, mineral admixtures, etc., but There are often one or several disadvantages such as reduced compressive strength, high cost, and complicated process, which make it impossible to widely promote the use in the field of civil engineering

Method used

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  • Super-tough concrete for prefabricated members and preparation method of super-tough concrete
  • Super-tough concrete for prefabricated members and preparation method of super-tough concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for preparing super-tough concrete for prefabricated components, comprising the following steps:

[0029] (1) Prepare an aqueous solution of tannic acid with a mass concentration of 1%;

[0030] (2) Weighing Portland cement, aggregate, tannic acid aqueous solution and polycarboxylate high-performance water reducer, the amount of the cement is 300 parts, the amount of the aggregate is 500 parts, where by mass The sand accounts for 30%, the stone accounts for 70%, the consumption of the tannic acid aqueous solution is 100 parts, and the consumption of the polycarboxylate high-performance water reducer is 1 part;

[0031] (3) Add the Portland cement, aggregate, tannic acid aqueous solution and polycarboxylate high-performance water reducing agent into a concrete mixer, and stir for 10 minutes to make concrete;

[0032] (4) The concrete was injection molded, and after curing for 24 hours, the mold was removed for autoclaving curing, the temperature was raised for ...

Embodiment 2

[0035] A method for preparing super-tough concrete for prefabricated components, comprising the following steps:

[0036] (1) Prepare vitamin C aqueous solution with a mass concentration of 1%;

[0037] (2) Weigh ordinary Portland cement, aggregate, vitamin C aqueous solution and polycarboxylate high-performance water reducer, the amount of the cement is 200 parts, the amount of the aggregate is 500 parts, of which The sand accounts for 30%, the stone accounts for 70%, the consumption of the vitamin C aqueous solution is 50 parts, and the consumption of the polycarboxylate high-performance water reducer is 1 part;

[0038] (3) Add the ordinary Portland cement, aggregate, vitamin C aqueous solution and polycarboxylate high-performance water reducing agent into a concrete mixer, and stir for 10 minutes to make concrete;

[0039] (4) Injection mold the concrete, remove the mold after curing for 12 hours, perform steam curing, heat up for 2 hours, keep the temperature at 90°C for...

Embodiment 3~5

[0042] Same as Example 2, the difference lies in: Examples 3-5 adopt standard curing at 20°C, constant temperature water bath curing at 40°C, and autoclaved curing at 180°C, respectively.

[0043] Measure the flexural compressive strength ratio of the concrete prepared by embodiment 2~5, the result is as follows figure 1 shown. Depend on figure 1 It can be seen that autoclave curing at 180 °C is more conducive to improving the toughening effect of vitamin C concrete precast components.

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PUM

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Abstract

The invention relates to super-tough concrete for a prefabricated member and a preparation method thereof, wherein the super-tough concrete for the prefabricated member comprises the following components in parts by weight: 120-500 parts of cement, 200-1000 parts of aggregate, 50-250 parts of a polyhydroxy compound aqueous solution and 0.1-20 part of a superplasticizer, wherein the mass concentration of the polyhydroxy compound aqueous solution is 0.01-10%. According to the invention, the polyhydroxy compound can significantly improve the flexural strength and toughness of the concrete, so that the concrete has the functional characteristics of high toughness, abrasion resistance, high damping and the like compared with a traditional concrete material, can be used as special concrete for sleepers, pavements, roadblocks, beam columns and other parts, and is used for shock absorption, energy dissipation and improvement of structural safety, durability and applicability.

Description

technical field [0001] The invention belongs to the field of concrete, in particular to super-tough concrete for prefabricated components and a preparation method thereof. Background technique [0002] Steam-cured concrete prefabricated components have the advantages of short construction period, less environmental pollution, convenient construction and low cost, and are widely used in high-speed railway engineering structures. However, steam curing shortens the concrete curing time again and again, and the initial tensioning time of prestressed steel bars is also further advanced. Under the action of early age load, the brittleness of concrete will generally increase, resulting in poor energy dissipation capacity, reduced ductility and durability of the structure. Poor, it is difficult to reach the design service life. As concrete prefabricated components become more and more widely used, their processing technology, material properties and economic benefits should meet mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B28/08C04B28/02C04B24/04C04B24/38C04B24/10C04B24/26C04B111/20
CPCC04B28/021C04B28/04C04B28/08C04B2111/2038C04B14/02C04B14/06C04B24/38C04B2103/302C04B24/045
Inventor 张津瑞康子叶韩庆华侯东帅董必钦
Owner TIANJIN UNIV
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