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Nano C-S-H gel super-early strength agent and preparation method thereof

A C-S-H, early strength agent technology, applied in the field of concrete admixtures, can solve problems such as difficult to control the dosage, reduced durability, corrosion of steel bars, etc., and achieve the effects of promoting crystal growth, functional group coordination, and high water reducing capacity

Inactive Publication Date: 2019-11-08
CHONGQING SANSHENG IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the main defect of this method is that if a large amount of inorganic salt accelerators such as chlorinated salts and sulfates are used, it is often easy to cause steel bar corrosion, concrete impermeability, and durability reduction; such as the amount of triethanolamine accelerators Difficult to control, over-mixing will easily cause ultra-retarding phenomenon

Method used

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  • Nano C-S-H gel super-early strength agent and preparation method thereof
  • Nano C-S-H gel super-early strength agent and preparation method thereof
  • Nano C-S-H gel super-early strength agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] A. Weigh 400g of isobutylene alcohol polyoxyethylene ether with a weight average molecular weight of 5000 and 400g of water into the reaction kettle, start the stirring device at a speed of 250rpm, heat to 40°C, weigh 0.5g of ascorbic acid, 2g of mercaptoethanol, and add 100g Prepare solution E in water for later use; weigh 36.0g of acrylic acid, 1.0g of acrylamide, and 5.0g of 2-acrylamide-2-methylpropanesulfonic acid, add it to 100g of water, and prepare for later use as solution F. After the temperature is stable, take by weighing 3.5g30% hydrogen peroxide aqueous solution, add in the reactor, drip solution E, solution F simultaneously in the reactor after 5 minutes, the dripping time of solution E is 210 minutes, the solution F The dropwise addition time was 180 minutes. After the dropwise addition is completed, keep warm and continue to stir for 1 hour. After the reaction is completed, add 30% NaOH solution to adjust the pH value to 6.9 to obtain an early-strength ...

Embodiment 2

[0072] A. Weigh 400g of isobutylene alcohol polyoxyethylene ether with a weight average molecular weight of 5000 and 400g of water into the reaction kettle, start the stirring device at a speed of 250rpm, heat to 40°C, weigh 0.5g of ascorbic acid, 2g of mercaptoethanol, and add 100g In water, prepare solution E for later use; weigh 40.0g of acrylic acid, 1.0g of acrylamide, and 5.0g of 2-acrylamide-2-methylpropanesulfonic acid, add it to 100g of water, and prepare for later use as solution F. After the temperature is stable, take by weighing 3.5g30% hydrogen peroxide aqueous solution, add in the reactor, drip solution E, solution F simultaneously in the reactor after 5 minutes, the dripping time of solution E is 210 minutes, the solution F The dropwise addition time was 180 minutes. After the dropwise addition is completed, keep warm and continue to stir for 1 hour. After the reaction is completed, add 30% NaOH solution to adjust the pH value to 6.9 to obtain an early-strength...

Embodiment 3

[0077] A. The weight and preparation method of each component of the early-strength polycarboxylate high-performance water reducer are the same as in Example 2.

[0078] B. Weigh 100g of the early-strength polycarboxylate superplasticizer obtained in step A, dissolve it in 300g of water, add 30% NaOH, adjust the pH value to 13.5, and stir to obtain solution A for use; weigh 130g of calcium nitrate tetrahydrate , 120g of sodium metasilicate pentahydrate were dissolved in 100g and 220g of water respectively, and stirred evenly to obtain solution B and solution C for later use.

[0079] C. Add solution A to the reaction kettle, and add 3.0g diethanol monoisopropanolamine, turn on the stirring device to stir evenly, the rotation speed is 500rpm, and start the temperature controller to heat to 60°C, and drop solution A and solution B at the same time , The dropping time is 3h.

[0080] D. Insulate and keep stirring for 1 hour. After the reaction, the material is discharged to obta...

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Abstract

The invention relates to a nano C-S-H gel super-early strength agent, which comprises the following components by weight: 30-50 parts of a polyether macromonomer; 3-6 parts of unsaturated acid; 0.5-2parts of an early strength monomer, 0.1-0.3 part of a chain transfer agent; 0.4-1 part of an initiator; and 40-70 parts of water. By strictly controlling the proportion and concentration of a calciumsource and a silicon source, the dosage, concentration and pH value of an added early strength polycarboxylate superplasticizer, the alcohol amine dosage, as well as the rotation speed, temperature and dripping time in the synthesis process, nanosheets of C-S-H with surface adsorption and intercalated structure. The nanosheets reduce the free energy of activation in crystals to zero so as to promote crystal growth and greatly accelerate the hydration of C3S (tricalcium silicate) and C2S (dicalcium silicate) in the Portland cement in concrete, thereby improving the early strength of concrete.

Description

technical field [0001] The invention relates to the field of concrete admixtures, in particular to a nano C-S-H gel super early strength agent and a preparation method thereof. Background technique [0002] With the continuous development and improvement of concrete technology, concrete, as one of the commonly used building materials, has been widely used in more and more fields. At the same time, the performance of concrete has also put forward higher and higher requirements. [0003] Excellent workability, easy pumping construction, high strength, high durability and super early strength have attracted more and more attention. Early-strength and ultra-early-strength concrete have broad market application prospects in the construction, maintenance and reinforcement of roads, bridges, ports, prestressed high-strength pipe piles and other projects. With the continuous advancement of housing commercialization, it also promotes the rapid development of early-strength and super...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F222/02C08F220/56C08F220/58C04B24/26C04B103/30C04B103/12
CPCC04B24/2694C04B40/0039C04B2103/12C04B2103/302C08F283/065C08F220/06C08F222/02C08F220/56C04B24/26C04B24/04C04B14/28C04B22/085C04B12/04C04B24/122
Inventor 潘先文李丹阳李光明
Owner CHONGQING SANSHENG IND CO LTD
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