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Stable pumping type slump retaining agent and preparation method thereof

A slump-retaining agent and pumping technology, which is applied in the field of building materials, can solve the problems of not meeting the needs of concrete construction well, prone to segregation, bleeding, and not fully satisfying cement, so as to achieve reasonable distribution of hydration products and enhanced Adsorption and retarding ability, delaying and reducing the effect of heat of hydration

Active Publication Date: 2021-06-08
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the viscoplasticity of existing concrete pumping agents is not good enough, and segregation and bleeding are prone to occur. Due to the poor adaptability of concrete pumping agents, they are usually only suitable for a small number of cement varieties, and their fluidity is not good. Crystals, precipitation, causing pipeline blockage, unable to use normally and other problems
In addition, after the concrete is poured, due to the influence of the surrounding medium, the water will lose quickly and the humidity will drop, which cannot fully meet the water required for hydration in the early stage of the cement. cracks; moreover, with the development of civil construction technology, the requirements for concrete are getting higher and higher, and the existing pumping agents can no longer meet the needs of concrete construction.

Method used

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  • Stable pumping type slump retaining agent and preparation method thereof
  • Stable pumping type slump retaining agent and preparation method thereof
  • Stable pumping type slump retaining agent and preparation method thereof

Examples

Experimental program
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preparation example Construction

[0033] The preparation method of the stable pumping type slump retaining agent of the present invention comprises the following steps:

[0034] (1) Add 17.6-19.1 parts of polyether alcohol head and 0.3-0.9 parts of catalyst into a high-pressure reactor equipped with a stirrer and a thermometer, and start vacuuming to gauge pressure (-0.085) ~ (-0.090) after nitrogen replacement for 3 times )MPa, then heat up to 110-115°C to start dehydration for 1-1.5h, cool down to 105°C and start to continuously feed 301.8-310.0 parts of cyclic monomers, control the pressure to less than 0.6MPa, and keep warm at 100-110°C for 2 -3h aging to negative pressure, cooling down and discharging to obtain polyether monomer with a molecular weight of about 2000.

[0035] (2) Add the polyether monomer prepared in step (1) into the reaction kettle, heat up to 45-50°C with a water bath; prepare A Liquid, 42.5-43.6 parts of ester substances, 0.5-1.0 parts of alcohol head, 2.1-5.4 parts of reducing agent...

Embodiment 1

[0037] A stable pumping type slump inhibitor is mainly composed of the following components, the total mass of raw materials is 1000 parts, and each component includes: 18.9 parts of poly-1,2-propylene glycol, 301.9 parts of ethylene oxide, 0.6 parts of aluminum lithium, 42.8 parts of diethyl acrylate, 4.3 parts of sodium formaldehyde sulfoxylate, 3.3 parts of di-tert-butyl peroxide, 1.9 parts of thioglycolic acid, 5.7 parts of triethanolamine, the rest is water, the total mass is 1000 parts.

[0038] The preparation method of the described stable pumping type slump retaining agent comprises the following steps:

[0039] (1) Add 17.9 parts of poly-1,2-propylene glycol and 0.6 parts of lithium aluminum hydride to a high-pressure reactor equipped with a stirrer and a thermometer, and start vacuuming to gauge pressure -0.085MPa after nitrogen replacement for 3 times, and then heat up to Start dehydration at 115°C for 1 hour, cool down to 105°C and start feeding 301.9 parts of eth...

Embodiment 2-6

[0042] Concrete parameters (steps are the same) in the concrete raw material of embodiment 2-6 and preparation method are different from embodiment 1, specifically as shown in table 1 and table 2 below (table 1 is raw material, and table 2 is the preparation method in parameter), the representations not listed in table 2 are the same as in Example 1.

[0043] Table 1

[0044]

[0045]

[0046]

[0047] Table 2

[0048]

[0049] The product of the present invention and Hubei Tengchen TC-900B slump-retaining agent are made into C50 concrete samples, and the following table 3 is obtained through testing.

[0050] table 3

[0051]

[0052]

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Abstract

The invention discloses a stable pumping type slump retaining agent and a preparation method thereof, and belongs to the technical field of concrete. The slump retaining agent is mainly prepared by polymerizing the following components in parts by mass: 18.6 to 20.1 parts of polyether alcohol, 301.8 to 310.0 parts of cyclic monomer, 0.3 to 0.9 part of catalyst, 42.5 to 43.6 parts of ester substance, 2.1 to 5.4 parts of reducing agent, 2.5 to 4.4 parts of initiator, 0.8 to 2.6 parts of chain transfer agent, 5.3 to 7.9 parts of neutralizing agent and the balance of water, wherein the total mass of the raw materials is 1000 parts. The polyether monomer is firstly prepared, the acid-ether ratio of the prepared slump retaining agent is determined according to the molecular weight of the prepared polyether, and the coating performance of the molecules of the slump retaining agent is improved. The molecular branch chain of the slump retaining agent is a polyether branch chain which has good flexibility and hydrophilicity and shows the coating performance and high slump retaining performance of the slump retaining agent.

Description

technical field [0001] The invention belongs to the technical field of building materials and relates to the technical field of concrete, in particular to a stable pumping type slump-retaining agent and a preparation method thereof. Background technique [0002] Concrete is an important building material in the construction industry. The general construction site adopts the pumping process for pouring, which requires the concrete to have good fluidity and pumpability; but in most cases, the mixing time of the concrete is too long , severe loss of fluidity will occur and pumping will not be possible. Therefore, by adding a pumping agent to improve the pumping performance of the concrete mixture, the concrete mixture can pass through the pipeline smoothly, without clogging, without segregation, and with good viscoplasticity. The existing pumping agent is usually composed of It is compounded by slump retaining agent, retarder, air-entraining agent and lubricant. [0003] At p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/18C04B24/26
CPCC08F283/06C04B24/2647C08F220/1802
Inventor 柯凯颉永宁李相国吕阳江波
Owner HUBEI UNIV OF TECH
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