Carboxylic acid polyalcohol water reducing agent capable of controlling concrete slump loss

A technology of slump loss and carboxylic acid polymer, which is applied in the field of water reducing agent to control concrete slump loss, can solve the problems of fresh concrete slump loss, reducing the dispersion effect of water reducing agent, and high process reaction temperature , to achieve the effect of improving slump loss, controlling slump loss and delaying physical coagulation

Inactive Publication Date: 2008-07-02
NANJING RUIDI HIGH TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the cement hydration reaction proceeds, the molecules of the water reducer that were originally adsorbed on the surface of the cement particles will be covered by the hydration products of the cement, which reduces the dispersion effect of the water reducer, resulting in the loss of slump of freshly mixed concrete.
In addition, some

Method used

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  • Carboxylic acid polyalcohol water reducing agent capable of controlling concrete slump loss
  • Carboxylic acid polyalcohol water reducing agent capable of controlling concrete slump loss
  • Carboxylic acid polyalcohol water reducing agent capable of controlling concrete slump loss

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1 Preparation of water reducer of the present invention

[0037] 1) Esterification reaction

[0038] Melt 100g of polyethylene glycol 1000 at 80-90°C, put it into a four-necked flask, add 49g of maleic anhydride, stir and dissolve evenly, add 4g of catalyst p-toluenesulfonic acid and stir to dissolve, then add 0.20g of catalyst concentrated Sulfuric acid, after stirring evenly, add the solvent cyclohexane (the amount of solvent is based on normal reflux), the temperature of the feed liquid is raised to 110°C, the reaction is carried out under reflux and the water is separated, and the water output in the water separator is measured every 1 hour , to stop the reaction when the water output is close to the theoretical value. In the reaction process, in order to maintain the normal progress of the reflux, an appropriate amount of cyclohexane solvent can be supplemented. After the reaction, cyclohexane was distilled off under reduced pressure to obtain formula ...

Embodiment 2

[0046] (1) Esterification reaction

[0047] The steps are the same as in Example 1, except that the reflux reaction temperature is 120°C.

[0048] (2) Polymerization reaction

[0049] The steps are the same as in Example 1, except that the amount of monomer c to be fed is measured according to the molar ratio of a to c of 1:2.

Embodiment 3

[0051] (1) Esterification reaction

[0052] The steps are the same as in Example 1, except that the reflux reaction temperature is 135°C.

[0053] (2) Polymerization reaction

[0054] The steps are the same as in Example 1, except that the feed amount of monomer c is measured according to the molar ratio of a and c being 2:1.

[0055] The water reducing agents prepared in Example 1, Example 2 and Example 3 were added to the concrete according to the solid content of 0.2% (that is, the weight percentage of the cement), and the cement in the concrete was all made of Onoda cement (P.II 52.5) . The initial slump of the concrete is controlled at 18-20cm. After 2 hours, the slump retention rate and related index performance are tested. The measured data are shown in comparison table 2.

[0056] Table 2 The effect of different feed ratios of a and c on the performance of concrete

[0057] Test items

[0058] From the test results of the three comparative examples, it c...

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PUM

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Abstract

The invention relates to carboxylic acid polymer which is an admixture of concrete which can control the slump loss of the concrete. Hydroxyl bifunctional polyether esterifies with bifunctional maleic or the acid anhydride of maleic to produce crosslinked large monomer, and copolymerizes with allylic alcohol ether and bifunctional small monomer to produce certain molecular weight polymer. The water-reducing agent can incessantly release small molecular weight water-reducing agent during the hydration of the cement, thereby the goal of continuously restraining slump loss is achieved.

Description

technical field [0001] The invention belongs to the field of concrete admixtures, in particular to a water reducing agent used for controlling the slump loss of concrete. Background technique [0002] Concrete is made of cement, sand, stone, and water. For the convenience of construction, the amount of water added is related to the workability and fluidity of concrete, but the level of water content is also related to the loss of concrete slump. Concrete slump loss is an inevitable phenomenon in the process of concrete application, but excessive slump loss will affect the construction quality. During construction, the concrete slump loss is required to be as small as possible. Water reducer is an admixture with water reducing and retarding effects, which can improve the workability and rheology of concrete, and can reduce water consumption without affecting workability and rheology, thereby reducing concrete Slump loss; or under the condition that the concrete slump is basi...

Claims

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Application Information

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IPC IPC(8): C04B24/28C04B103/30
Inventor 段国荣黄国泓陈健沈冬梅宋可顺王毅李爱梅
Owner NANJING RUIDI HIGH TECH
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