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Low-resilience high-strength shotcrete enhancer

A technology of sprayed concrete and strengthening agent, which is applied in the field of concrete admixtures, can solve the problems of concrete quality control hazards, construction difficulties, and affecting performance, etc., to improve the mixing effect and measurement accuracy, optimize the mixing time and speed, and achieve good flow The effect of dynamic effect

Active Publication Date: 2020-06-23
天津如米基业新材料有限公司
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

At present, the application of shotcrete strengthening agent in our country has made great progress, but many problems have been exposed in the actual application process, which directly affects the performance of use, and even poses hidden dangers to the service life.
At present, there are mainly three problems: (1) Mixing is not easy to be uniform: most of the current concrete strengtheners are mixtures of various solid materials, and problems such as stratification and precipitation occur due to uneven mixing and long-term storage. Insufficient content of the effective components of the strengthening agent, thereby greatly reducing its performance, causing harm to the quality control of concrete, and even causing engineering accidents; (2) Low measurement accuracy: With the advancement of admixture technology, the admixture in concrete The proportion of it is getting smaller and smaller, so the accuracy requirements of its addition are getting higher and higher
In the process of on-site construction, in order to meet the measurement requirements, it is necessary to be equipped with a measurement system device with high measurement accuracy, and the requirements for the operation level and experience of the construction personnel are high. Accidents caused by improper addition of admixtures occur from time to time, which further leads to (3) High rebound rate: after the current existing concrete strengthening agent is added, the rebound rate in the spraying process is generally higher than 10%, which makes construction difficult

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  • Low-resilience high-strength shotcrete enhancer
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  • Low-resilience high-strength shotcrete enhancer

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preparation example Construction

[0027] The present invention has low rebound rate, high stability and high strength sprayed concrete reinforcing agent can be prepared by following preparation method, and described preparation method comprises the following steps: (1) plant polysaccharide is stirred in water bath, makes it fully swell, obtains plant polysaccharide solution; (2) adding six-carbon water reducer and amphiphilic CNF into the plant polysaccharide solution and stirring quickly to obtain a mixed solution; (3) adding rice husk ash to the mixed solution and stirring quickly to obtain a strengthening agent.

[0028] In the preparation of the plant polysaccharide solution in step (1), the mass fraction of the plant polysaccharide needs to be controlled at 0.1wt%-0.5wt%. If the mass fraction is lower than 0.1 wt%, the viscosity of the resulting dispersion is too low to thicken, and thus cannot disperse, suspend and stabilize admixtures such as rice husk ash. If it is placed for a long time, it will easil...

Embodiment 1

[0037] This embodiment provides a low-rebound, high-stability high-strength shotcrete strengthening agent, including the following components by weight: 560 parts of rice husk ash, 30 parts of amphiphilic CNF, 30 parts of polycarboxylate superplasticizer, konjac Glucomannan 0.38 parts, water 380 parts. The concrete strengthening agent preparation method of the present embodiment, concrete steps are as follows:

[0038] (1) Evenly disperse 0.38g of konjac flour in 380mL of water, stir and swell in a water bath at 60°C for 3 hours, let it stand and cool to room temperature after fully swelling, and obtain a konjac glucomannan solution with a mass fraction of 0.1wt%;

[0039] (2) Pour 30g of amphiphilic CNF and 30g of polycarboxylate superplasticizer into the konjac glucomannan solution, and quickly mix and stir at a speed of 300r / min for 8min to obtain a mixed solution;

[0040] (3) Pour the rice husk ash into the mixed liquid and stir well to obtain the strengthening agent.

...

Embodiment 2

[0044] This embodiment provides a high-strength shotcrete reinforcement with low resilience and high stability, including the following components by weight: 520 parts of rice husk ash, 20 parts of amphiphilic CNF, 20 parts of polycarboxylate superplasticizer, Konjac glucomannan 0.88 parts, water 440 parts.

[0045] The concrete strengthening agent preparation method of the present embodiment, concrete steps are as follows:

[0046] (1) Evenly disperse 0.88g of konjac flour in 440mL of water, stir and swell in a water bath at 80°C for 2h, let it stand and cool to room temperature after fully swelling, and obtain a konjac glucomannan solution with a mass fraction of 0.2wt%;

[0047] (2) Pour 20g of amphiphilic CNF and 20g of polycarboxylate superplasticizer into the konjac glucomannan solution, and quickly mix and stir at a speed of 260r / min for 15min to obtain a mixed solution;

[0048] (3) Pour 520g of rice husk ash into the mixed liquid and stir fully to obtain a strengthen...

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Abstract

The invention discloses a high-strength shotcrete enhancer with low resilience and high stability. The high-strength shotcrete enhancer is prepared from rice hull ash, cellulose nanofibers, a six-carbon water reducing agent, plant polysaccharide and water. The plant polysaccharide powder is fully swollen, a water reducing agent is added and fully stirred, then rice hull ash and cellulose nanofibers are added and rapidly stirred, and the high-strength sprayed concrete enhancer with low resilience rate and high stability is obtained. According to the invention, the rebound rate of shotcrete andthe like can be reduced to below 2% while the dispersity and fluidity of the reinforcer are ensured, the stability is improved, the problems of layering and precipitation caused by long-time placementare solved, and the performance of the reinforcer is prevented from being damaged. Furthermore, in the actual application process, the enhancer can be used in real time after being conveyed to a construction site, has the advantages of accurate on-site addition and measurement, easiness in uniform mixing, environmental friendliness, no pollution and the like, can effectively reduce the rebound rate of sprayed concrete and improve the compression resistance, impermeability, wear resistance and other properties, provides convenience for actual construction, and has very good performance and very high operation practicability.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a high-strength shotcrete reinforcement with low resilience and high stability. Background technique [0002] According to incomplete statistics from China Concrete Network, the total output of commercial concrete in my country in 2018 was 2.547 billion cubic meters. With the continuous improvement of my country's urbanization level, the concrete industry will continue to maintain steady growth. Concrete is an indispensable and important material in infrastructure construction, and its quality directly affects the service life of buildings. The emergence of concrete admixtures in the 1930s greatly improved the performance of concrete, promoted the development of concrete production and construction technology, improved the technical and economic effects, and then changed the concrete that is only composed of water, cement, sand, stone, etc. The concept of component c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/38
CPCC04B40/0039C04B18/101C04B16/0675C04B2103/302C04B24/383C04B22/002
Inventor 丁国杰
Owner 天津如米基业新材料有限公司
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