Preparation method and applications of composite super-early strength admixture

A composite and admixture technology, applied in the field of concrete admixtures, can solve the problems of reducing the early mechanical properties of concrete, negative concrete durability, and failing to achieve the expected improvement of early strength.

Active Publication Date: 2018-06-19
JIANGSU SOBUTE NEW MATERIALS +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, a large number of mineral admixtures are applied to concrete to improve the resistance of concrete to environmental erosion. However, most mineral admixtures will significantly reduce the early mechanical properties of concrete, which affects its wider application in the field of building materials.
[0003] At present, there are very few early-strength polycarboxylate superplasticizers on the market at home and abroad. They are basically made of polycarboxylate superplasticizers and conventional early-strength agents. Due to compatibility problems, As a result, the expected technical effect of improving the early strength cannot be achieved, and it may also have a negative impact on the long-term compressive strength of concrete.
In patents CN106007452A and CN103373831A, sodium sulfate and thiocyanate are used as inorganic early-strength agents and polycarboxylate superplasticizers to compound, so that it has early-strength effects, and the content of thiocyanate in cement is strictly limited Yes, thiocyanate has great side effects on the human body, and using sulfate as an early-strength material has a negative effect on the later durability of concrete
In addition, it is the early strength technology based on nanomaterials. Patent CN104402288A discloses a calcium silicate hydrate gel solution early strength agent. Its raw materials use calcium materials, silicon materials and gel dispersants. The dispersant is a naphthalene sulfonate formaldehyde condensate, and its dispersing effect is limited, so the prepared gel particle size is relatively thick, and the early strength effect is limited. Due to the influence of the rigid structure, the formed substance is not an intercalation substance, and the nanomaterial after intercalation will have a better early strength effect
Patents CN105585286A and CN103724557A disclose an early-strength polycarboxylate water reducer. The structure of the water reducer prepared by them all has amino cations, but the preparation process is relatively complicated and the cost is relatively expensive

Method used

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  • Preparation method and applications of composite super-early strength admixture
  • Preparation method and applications of composite super-early strength admixture
  • Preparation method and applications of composite super-early strength admixture

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Weigh 0.317g octavinyl POSS, 160.8g block polycarboxylic acid A-1 containing thiol group and place in a round bottom flask, dissolve it with 300mL tetrahydrofuran, then add 0.162g dimethylphenylphosphine, Magnetic stirring was used to make it dissolve, and after nitrogen reflux for 30 minutes, 0.321 g of n-hexylamine was added, nitrogen reflux was continued for 30 minutes, and reaction was sealed at 35° C. for 12 hours. After the reaction, the tetrahydrofuran solvent was removed by rotary evaporation to obtain POSS-based star-shaped block polycarboxylic acid. Dissolve 148.5g of the above synthesized sample in 250g of water, keep stirring, and raise the temperature to 20°C, dissolve 98.5g of B-1 in 145g of water as the addition solution B, and dissolve 147.8g of C-1 in 210g of water as the addition solution C. At the same time, start to drop solution B and solution C at a constant speed. The dropping time is 2 hours.

Embodiment 2

[0033]Weigh 0.317g octavinyl POSS, 145.6g block polycarboxylic acid A-2 containing thiol group and place in a round bottom flask, dissolve it with 300mL tetrahydrofuran, then add 0.212g dimethylphenylphosphine, Magnetic stirring was used to dissolve it. After nitrogen reflux for 30 minutes, 0..433 g of n-hexylamine was added, nitrogen reflux was continued for 30 minutes, and reaction was sealed at 45°C for 18 hours. After the reaction, the tetrahydrofuran solvent was removed by rotary evaporation to obtain POSS-based star-shaped block polycarboxylic acid. Dissolve 101.7g of the above synthesized sample in 300g of water, keep stirring, and raise the temperature to 40°C, dissolve 147.7g of B-1 in 200g of water as the drop solution B, and dissolve 98.5g of C-2 in 150g of water as the drop solution Solution C, start to drop solution B and solution C at a constant speed at the same time, the dropping time is 8 hours, keep warm for 5 hours after dropping, cool down and discharge, an...

Embodiment 3

[0035] Weigh 0.317g octavinyl POSS, 152.0g block polycarboxylic acid A-3 containing thiol group and place in a round bottom flask, dissolve it with 300mL tetrahydrofuran, then add 0.304g dimethylphenylphosphine, Magnetic stirring was used to dissolve it, and after nitrogen reflux for 30 minutes, 0.609 g of n-hexylamine was added, nitrogen reflux was continued for 30 minutes, and reaction was sealed at 50°C for 24 hours. After the reaction, the tetrahydrofuran solvent was removed by rotary evaporation to obtain POSS-based star-shaped block polycarboxylic acid. Dissolve 82.5g of the above synthesized sample in 350g of water, keep stirring, and raise the temperature to 30°C, dissolve 50.7g of B-1 in 220g of water as dropwise solution B, and dissolve 53.5g of C-1 in 240g of water as dropwise Solution C, start to drop solution B and solution C at a uniform speed at the same time, the dropping time is 10h, keep warm for 3h after dropping, cool down and discharge, and the compound su...

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Abstract

The invention discloses a composite super-early strength admixture preparation method, which comprises: dissolving octavinyl POSS and a block polycarboxylic acid A containing a thiol group in a tetrahydrofuran solvent, carrying out a thiol-alkenyl click chemistry reaction under the action of a catalyst, and carrying out rotary evaporation to remove the tetrahydrofuran solvent after completing thereaction so as to obtain a POSS-based star block polycarboxylic acid water-reducing agent; and at a temperature of 20-40 DEG C, simultaneously adding a soluble calcium salt B aqueous solution and a soluble silicate C aqueous solution into the POSS-based star block polycarboxylic acid water-reducing agent in a dropwise manner at a uniform speed, and carrying out thermal insulation for 2-5 h after completing the adding so as to obtain the composite super-early strength admixture. According to the present invention, the POSS core inorganic nanometer structure material in the composite super-earlystrength admixture can achieve the compounding of the polycarboxylic acid water-reducing agent and the nanometer material, such that the dispersion efficiency of the inorganic nanometer structure material is high, the inorganic particles are stable and do not easily settle, the early strength is easily increased, and the transportation cost can be reduced.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and in particular relates to a composite super-early-strength admixture, which can accelerate the early hydration speed of cement-based materials and improve the early strength of concrete. Background technique [0002] With the construction of my country's infrastructure, polycarboxylate superplasticizers have been widely used in nuclear power, water conservancy, high-speed rail, subways, bridges, tunnels, etc., but more requirements have been put forward for them. Many large-scale projects will require the early strength of concrete to meet the design requirements. The strength of concrete constructed in low temperature environment in winter develops slowly. How to avoid the influence of inorganic salt early strength agents on its work performance, long-term mechanical properties and durability, and effectively improve its early strength is a hot spot that domestic and foreign schol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/28C08G81/02C04B103/12
CPCC04B40/0039C04B2103/12C08G81/024C04B24/28C04B22/08
Inventor 冉千平翟树英杨勇李申桐张建纲刘金芝刘加平
Owner JIANGSU SOBUTE NEW MATERIALS
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