Concrete early strength agent and preparation method thereof

An early-strength agent and concrete technology, applied in the field of concrete early-strength agent and its preparation, can solve the problems of insufficient C-S-H gel amount, decrease in system strength, unhelpful stone body strength, etc., and achieve the improvement of overall structural strength and the enhancement of early-stage frost resistance. , the effect of shortening the hardening time

Inactive Publication Date: 2017-11-24
温州市环美建筑工程有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the concrete mix is ​​cured mainly by the silicate in sodium silicate and the Ca produced by the hydration of cement. 2 + Reaction occurs to form C-S-H gel to maintain, so the cement-water glass slurry has the problems of low low-temperature strength and poor durability of stone bodies
At a low temperature of approximately 4°C, the hydration reaction of ordinary cement almost stops, and the silicate and Ca in sodium silicate 2 + The amount of C-S-H gel produced by the reaction is seriously insufficient, resulting in low-temperature strength of concrete
At the same time, the calcium content in cement is fixed, and the amount of calcium hydroxide generated

Method used

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  • Concrete early strength agent and preparation method thereof

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Effect test

Embodiment 1

[0026] A concrete early strength agent, comprising 1 part of sodium chloride, 1 part of sodium nitrite, 10 parts of sodium sulfate, 3 parts of calcium chloride, 2 parts of urea, 5 parts of methacrylic acid, 1 part of silane, and 1 part of calcium gluconate , 1 part of triisopropanolamine, 5 parts of fatty acid glycerides, 50 parts of polycarboxylate superplasticizer, 2 parts of finely ground cement stone of 0.3 μm.

[0027] The above-mentioned concrete accelerator is prepared through the following steps:

[0028] Step 1: According to the molar ratio, methallyl polyoxyethylene ether, maleic anhydride and vinyl propionate = 0.05:0.3:0.1 weigh methallyl polyoxyethylene ether, maleic anhydride And vinyl propionate, be placed in the reactor and add the hydrogen peroxide that massfraction is 5% as initiator;

[0029] Step 2: Let the material in the reactor react under the conditions of 80°C and 3MPa to obtain a polycarboxylate water reducer;

[0030] Step 3: Weigh 2 parts of 0.3 μ...

Embodiment 2

[0032] A concrete early strength agent, comprising 1.5 parts of sodium chloride, 1.5 parts of sodium nitrite, 13 parts of sodium sulfate, 4 parts of calcium chloride, 3 parts of urea, 8 parts of methacrylic acid, 1.5 parts of silane, and 2 parts of calcium gluconate , 2 parts of triisopropanolamine, 6 parts of fatty acid glycerides, 60 parts of polycarboxylate superplasticizer, 2.5 parts of finely ground cement stone of 0.3 μm.

[0033] The above-mentioned concrete accelerator is prepared through the following steps:

[0034] Step 1: According to the molar ratio, methallyl polyoxyethylene ether, maleic anhydride and vinyl propionate = 0.05:0.3:0.1 weigh methallyl polyoxyethylene ether, maleic anhydride And vinyl propionate, be placed in the reactor and add the hydrogen peroxide that massfraction is 5% as initiator;

[0035] Step 2: Let the material in the reactor react under the conditions of 80°C and 3MPa to obtain a polycarboxylate water reducer;

[0036]Step 3: Weigh 2.5 ...

Embodiment 3

[0038] A concrete early strength agent, comprising 2 parts of sodium chloride, 2 parts of sodium nitrite, 15 parts of sodium sulfate, 4 parts of calcium chloride, 6 parts of urea, 12 parts of methacrylic acid, 3 parts of silane, and 5 parts of calcium gluconate , 5 parts of triisopropanolamine, 8 parts of fatty acid glycerides, 80 parts of polycarboxylate superplasticizer, 4 parts of finely ground cement stone of 0.3 μm.

[0039] The above-mentioned concrete accelerator is prepared through the following steps:

[0040] Step 1: According to the molar ratio, methallyl polyoxyethylene ether, maleic anhydride and vinyl propionate = 0.05:0.3:0.1 weigh methallyl polyoxyethylene ether, maleic anhydride And vinyl propionate, be placed in the reactor and add the hydrogen peroxide that massfraction is 5% as initiator;

[0041] Step 2: Let the material in the reactor react under the conditions of 80°C and 3MPa to obtain a polycarboxylate water reducer;

[0042] Step 3: Weigh 4 parts of...

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PUM

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Abstract

The invention discloses a concrete early strength agent and a preparation method thereof. The concrete early strength agent is prepared from the following components in parts by weight: 1-3 parts of sodium chloride, 1-3 parts of sodium nitrite, 10-20 parts of sodium sulfate, 3-6 parts of calcium chloride, 2-6 parts of urea, 5-15 parts of methacrylic acid, 1-3 parts of silane, 1-5 parts of calcium gluconate, 1-5 parts of triisopropanolamine, 5-10 parts of fatty glyceride, 50-80 parts of polycarboxylate superplasticizer and 2-4 parts of finely grinded cement stone. The concrete early strength agent has the beneficial effects of rapidly drying concrete even in a low-temperature environment.

Description

technical field [0001] The invention relates to a cement external admixture, in particular to a concrete early strength agent and a preparation method thereof. Background technique [0002] Generally speaking, concrete engineering accounts for about half of the entire civil engineering, so the hardening speed of concrete plays a very important role in shortening the construction period of civil engineering. At present, there are many external admixtures used in China to improve the early strength of concrete at 10-40°C, such as cement-water glass slurry early strength agent, which has the advantages of short setting time and high setting rate. Over the years, concrete early strength agents have been widely used in soft soil reinforcement, well wall grouting, water seepage accident treatment, etc., and solved many key problems. Because the concrete mix is ​​cured mainly by the silicate in sodium silicate and the Ca produced by the hydration of cement. 2 + The reaction takes...

Claims

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Application Information

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IPC IPC(8): C04B24/42C04B103/12
CPCC04B40/0042C04B2103/12C04B22/124C04B22/085C04B22/147C04B24/126C04B24/04C04B24/42C04B24/122C04B24/045C04B24/10C04B22/00C04B20/008C04B2103/302
Inventor 金柏盛陈建海
Owner 温州市环美建筑工程有限公司
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