High-performance concrete and preparation method thereof

A high-performance concrete and gel material technology, applied in the field of concrete materials, can solve problems such as insufficient compression resistance, flexural resistance, difficulty in separating free water, and stuck mixing equipment, so as to improve dispersion and dissipation efficiency and prevent increase The effect of tough fiber agglomeration and good viscosity

Pending Publication Date: 2020-11-13
GUANGDONG CONSTR VOCATIONAL TECH INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the performance superiority of concrete materials often determines the safety and stability of the entire project construction, while the compressive and flexural properties of traditional concrete materials are often not good enough, and it is difficult to meet the construction requirements in large-scale infrastructure projects.
Moreover, the traditional c

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  • High-performance concrete and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0033] A high-performance concrete, including gel material, aggregate, admixture, toughening fiber, mixing water, proportioned according to mass fraction, wherein:

[0034] The gel material includes 50-70 parts of Portland cement, 15-25 parts of fly ash, and 15-25 parts of silica fume;

[0035] The aggregate includes 16-19 parts of fine river sand, 4-6 parts of ISO standard sand, and 0.5-1.5 parts of quartz sand;

[0036] The admixture includes polycarboxylate water reducer, hydroxypropyl methylcellulose;

[0037] The toughening fibers include 1-1.5 parts of pva chopped fibers and 0.6-1.5 parts of pp fibers, and the quality of the toughening fibers does not exceed 3% of the mass of the gel material;

[0038] The ratio of the mixing water mass to the gel material mass is less than 0.3.

Embodiment 2

[0040] The technical content described in embodiment 1 is further detailed and supplemented, the Portland cement adopts 52.5 Portland cement, the fly ash adopts first-grade fly ash, and the silica fume adopts nano silica fume;

[0041] Fine river sand adopts freshwater river fine river sand whose particle size range is set between 0.45-0.75mm, and its gradation effect is good, and the ratio of aggregate mass to gel material mass is set between 0.20-0.30;

[0042] The ratio of the mass of the admixture to the mass of the gel material is set between 0.001-0.002;

[0043] The length of pva chopped fiber is set between 6-12mm, and the length of pp fiber is set at 9-12mm;

[0044] Tap water is used for mixing water, and the construction effect of high-performance concrete is the best when the ratio of mixing water mass to gel material mass is set between 0.15-0.25.

Embodiment 3

[0046] A preparation method of high-performance concrete has the following steps:

[0047] S1: Mix Portland cement, fly ash, and silica fume and stir evenly to form a gel material;

[0048] S2: Add a specific amount of mixing water and stir to mix evenly, so that the mixture is in a slurry state;

[0049] S3: Slowly add the toughening fiber several times, and stir evenly to ensure that the toughening fiber is fully dispersed in the gel material;

[0050] S4: Add a specific amount of mixing water to adjust fluidity;

[0051] S5: adding a specific amount of hydroxypropyl methylcellulose to adjust the consistency;

[0052] S6: Add a specific amount of mixing water and a specific amount of aggregate, and stir evenly;

[0053] S7: Add a specific amount of polycarboxylate superplasticizer, stir and mix evenly to produce high-performance concrete.

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Abstract

The invention discloses a high-performance concrete, which comprises a gel material, aggregate, an additive, toughening fibers and mixing water. The gel material comprises Portland cement, fly ash andsilica fume, the aggregate comprises fine river sand, ISO standard sand and quartz sand, and the additive comprises a polycarboxylate water reducer and hydroxypropyl methyl cellulose. The tougheningfibers comprise PVA chopped fibers and PP fibers, and the mass of the toughening fibers does not exceed 3% of the mass of the gel material. The mass ratio of the mixing water to the gel material is less than 0.3. The invention further discloses a preparation method of the high-performance concrete. The adding of the toughening fibers is before the adding of the aggregate so that the toughening fibers are effectively dispersed. The mixing water is added at different stages so that the dispersion and dissipation efficiency of the toughening fibers is improved; and after the toughening fibers areadded, the polycarboxylate water reducer is added, water is added at different stages, more free water can be released, and the workability of the whole stirring process is better.

Description

technical field [0001] The invention relates to the technical field of concrete materials, in particular to a high-performance concrete and a preparation method thereof. Background technique [0002] In today's society, my country's infrastructure construction is in a stage of rapid development, and a large amount of concrete materials will be used in the construction and construction of various infrastructures. Therefore, the performance superiority of concrete materials often determines the safety and stability of the entire project construction, while the compressive and flexural properties of traditional concrete materials are often not good enough, and it is difficult to meet the construction requirements in large-scale infrastructure projects. Moreover, the traditional concrete will produce cracks with a large width under the action of pressure, which seriously affects the safety of the overall building. [0003] At the same time, due to the fact that traditional conc...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B40/00
CPCC04B28/04C04B40/0032C04B2201/50C04B18/08C04B18/146C04B14/068C04B14/06C04B2103/302C04B24/42C04B22/002C04B16/0641C04B16/0633
Inventor 李玉甫贾世平李银波
Owner GUANGDONG CONSTR VOCATIONAL TECH INST
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