Method for producing water reducer of cement concrete

A manufacturing method and technology of a water reducing agent, applied in the field of building materials, can solve the problems of difficult construction, high price, complicated ingredients, etc., and achieve the effects of easy process control, simple production equipment, and high water reduction efficiency.

Inactive Publication Date: 2005-08-03
冯乃谦
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the mixture on the coagulation is easy to bleed, resulting in segregation and delamination, which makes construction difficult and affects the strength and durability of concrete.
Due to the large amount of phenol used in this type of water reducer, the cost is high
The existing ingredients of this type of water reducer are complex, and the production temperature exceeds 100°C (actually 110°C), and it is not easy to control
[0005] High-efficiency polycarboxylate superplasticizers are expensive, expensive, and complicated to produce

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] In 600 ml of water at 85°C, add 55 grams of calcium lignosulfonate, 86 grams of p-aminobenzenesulfonic acid, and 25 grams of phenol, stir for 30 minutes, add 22 grams of sodium hydroxide, and adjust the pH of the solution to 7-8 , at 85°C, drop 100 grams of formaldehyde, react at this temperature for 9 hours, cool to obtain a liquid superplasticizer (water agent), with a solid content of about 24%, and then dry to obtain a powdery superplasticizer ( powder).

[0028] Measurement results of fluidity of cement slurry

[0029] Cement (Mitsubishi General Silicon 425), 300 grams, w / c-0.30, water-based high-efficiency superplasticizer dosage 3.0%, powder dosage 0.7%, the fluidity of the clean slurry and the changes over time are as follows:

[0030] Initial 1 hour 2 hours Appearance

[0031] 1# water agent (3.0%) 240 mm 240 mm 230 mm no bleeding

[0032] 2# water agent (0.7%) 240 mm 245 mm 235 mm no bleeding

Embodiment 2

[0034] At 90°C, in 1000 ml of water, add 55 grams of calcium lignosulfonate, 86 g of p-aminobenzenesulfonic acid, and 55 grams of phenol, stir for 30 minutes, add 23 grams of sodium hydroxide, and adjust the pH value of the solution to 8. ℃, drop 120 grams of formaldehyde, react at this temperature for 10 hours, cool to obtain a liquid superplasticizer (water agent), with a solid content of about 24%, and then dry to obtain a powdery superplasticizer.

[0035] Fluidity of cement paste and its change over time

[0036] Example 1 of the combination of cement slurry

[0037] The cement used in the test is two kinds of ordinary silicon Mitsubishi 425 and mountain aluminum 425, code-named 3#, 4#.

[0038] Dosage of superplasticizer Initial fluidity 1 hour 2 hours

[0039] 3# water agent 2.5% 250 mm 245 mm 250 mm

[0040] Powder 0.7% 250 mm 260 mm 250 mm

[0041] 4# water agent 2.5% 240 mm 230 mm 220...

Embodiment 3

[0044] In 1000 milliliters of water at 90°C, add 90 grams of calcium lignosulfonate, 260 grams of p-aminobenzenesulfonic acid, and 140 grams of phenol, stir for 30 minutes, add 68 grams of sodium hydroxide, and adjust the pH value of the solution to 8. The temperature is 90°C, drop 360 grams of formaldehyde, react at this temperature for 10 hours, cool to obtain a liquid superplasticizer (water agent), with a solid content of about 30%, and then dry to obtain a powdery superplasticizer.

[0045] Fluidity of cement paste and its change over time

[0046] Mixing ratio of cement paste:

[0047] The cement is ordinary silicon Mitsubishi 425, water-cement ratio w / e=0.39, water: 86 grams, high-efficiency water reducing agent 2.0% in this embodiment, 6 grams, the flow rate of the net slurry and the change over time are as follows:

[0048] Dosage of superplasticizer Initial fluidity 1 hour 2 hours Appearance

[0049] Liquid 2.0% 255 mm 250 mm 240 mm n...

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PUM

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Abstract

The present invention relates to the production process of water reducer for cement and concrete, and belongs to the field of building material technology. The water reducer consists of calcium lignosulfonate, p-aminobenzenesulfonic acid, phenol, alkali and formaldehyde, and is produced into water preparation via adding water in 1-3 times. The production process includes heating water to 85-100 deg.c, adding the said materials successively via stirring, cooling to room to form water preparation, or further drying to form powder preparation. The present invention has the advantages of low temperature and normal pressure production, easy control of technological process, no environmental pollution, high function of controlling flowability loss of cement slurry and concrete and no harm to concrete durability.

Description

technical field [0001] The invention relates to a method for manufacturing a cement concrete water reducer, which uses p-aminobenzenesulfonic acid, lignin sulfonate, phenol, alkali and formaldehyde as raw materials to prepare a high-efficiency water reducer, belonging to the technical field of building materials. Background technique [0002] my country's concrete output is about 1.3 billion m 3 / year. The total output of superplasticizer is about 250,000 tons / year. The main varieties of superplasticizers are naphthalene series and melamine series. The former accounts for 90% of the superplasticizer consumption. In recent years, a small amount of polycarboxylate water reducer has been used in engineering. [0003] The main technical requirements of concrete to water reducing agent are: (1) high water reducing rate to reduce the water consumption of single concrete; (2) good dispersibility to cement and reduce water-cement ratio; (3) function of controlling slump loss Go...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/18C04B24/20
Inventor 冯乃谦王湘才张智峰丁宏李崇智
Owner 冯乃谦
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