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Concrete moisturizing curing and surface strengthening method

A technology for concrete surface and surface enhancement, which is applied in the processing of building materials, construction, building structure, etc., can solve the problems of unsatisfactory improvement of concrete erosion resistance, and achieve the reduction of chloride ion permeability coefficient and surface concrete porosity. , good dense filling effect, impermeability and durability improvement effect

Active Publication Date: 2019-09-24
RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Good concrete curing can improve the performance of surface concrete, such as reducing drying shrinkage cracking, etc., but the effect of improving the corrosion resistance of concrete is not ideal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The C50 concrete specimens were prepared, and the mix proportions are shown in Table 1.

[0017] Table 1 Concrete mix ratio (unit g / m 3 )

[0018] cement fly ash mineral powder sand Stones (5~10mm) Stones (10~20mm) water Superplasticizer 363 48.5 72 704 422 633 155 2.5

[0019] Form three groups of 100mm×100mm×400mm concrete shrinkage specimens, 150mm×150mm×150mm compression specimens and 150mm cylindrical specimens according to the mix ratio in Table 1. After the final setting of the concrete specimens (10h), remove the formwork, Then apply a layer of DPS evenly with a soft brush immediately, and the coating amount is 0.2kg / m 2 , after the first layer is dry, apply the second layer of DPS, the coating amount is 0.2kg / m 2 , and then wrapped with a pre-saturated curing film for 28 days. The relative humidity of the concrete surface when the permeable crystalline material is coated is 70%, and the water storage capacity of the cur...

Embodiment 2

[0021] Form three groups of 100mm×100mm×400mm concrete shrinkage specimens, 150mm×150mm×150mm compression specimens and 150mm cylindrical specimens according to the mix ratio in Table 1. After the final setting of the concrete specimens (10h), remove the formwork, Then apply a layer of DPS evenly with a soft brush immediately, and the coating amount is 0.25kg / m 2 , after the first layer is dry, apply the second layer of DPS, the coating amount is 0.25kg / m 2 , and then wrapped with a pre-saturated curing film for 28 days. The relative humidity of the concrete surface when coating the permeable crystalline material is 80%, and the water storage capacity of the curing film is 1 kg / m 2 , and the water release rate is 0.03 kg / d.

Embodiment 3

[0023] Form three groups of 100mm×100mm×400mm concrete shrinkage specimens, 150mm×150mm×150mm compression specimens and 150mm cylindrical specimens according to the mix ratio in Table 1. After the final setting of the concrete specimens (10h), remove the formwork, Then apply a layer of DPS evenly with a soft brush immediately, and the coating amount is 0.05kg / m 2 , and then wrapped with a pre-saturated curing film for 28 days. The relative humidity of the concrete surface when the permeable crystalline material is coated is 70%, and the water storage capacity of the curing film is 1 kg / m 2 , and the water release rate is 0.03 kg / d.

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PUM

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Abstract

The invention relates to a concrete moisturizing curing and surface strengthening method. By using a pre-saturated water-absorbing curing film, a concrete member coated with a permeable crystallization material is closely covered and cured, on the one hand, the condition for continuous permeation of the permeable crystallization material is provided, the penetration depth of the permeable crystallization material is increased, on the other hand, sufficient water is provided for the hydration reaction of the permeable crystallization material in pores of concrete, the pore diameter can be effectively refined, and a good dense filling effect is achieved. Meanwhile, good moisturizing curing further reduces the occurrence of cracks on the concrete surface and improves the quality of the concrete surface.

Description

technical field [0001] The invention belongs to the technical field of concrete maintenance, and in particular relates to a method for concrete moisture maintenance and surface enhancement. Background technique [0002] Cracking and leakage of concrete in the process of engineering construction is always a common problem in the quality of concrete structures. Reasonable maintenance methods are the key control links to ensure the quality of concrete engineering. very important. How to realize the whole process of concrete heat preservation and moisture preservation, reduce the risk of concrete drying shrinkage cracking and temperature stress cracking, and improve the durability of concrete structures has always been a hot spot in the field of concrete research. [0003] For most cast-in-place concrete, curing is required after the concrete is formed to provide a suitable temperature and humidity environment for the hydration of the cement, so as to ensure the early strength ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E04G21/24
CPCE04G21/246
Inventor 程冠之谢永江杨斌郑新国马西章黎庶曾志董全霄李享涛蒋睿郁培云谢清清
Owner RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI
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