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Retarded cement grinding aid and preparation method thereof

A cement grinding aid and retarding technology, which is applied in the field of cement grinding aids, can solve the problems of high cost and poor effect, and achieve the effects of small slump loss, saving cement consumption, and improving crack resistance

Active Publication Date: 2015-01-07
NANJING YONGNENG MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, molasses and sucrose are generally used as retarding cement grinding aids in the market. The existing retarders are not effective and cost high

Method used

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  • Retarded cement grinding aid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Embodiment 1: a kind of retarded cement grinding aid, composition is as follows:

[0013] Sodium carboxymethyl cellulose 0.01-0.02%,

[0014] Calcium sugar 25-30%,

[0015] Citric acid 5-10%,

[0016] The balance is water, and the total amount is 100%.

[0017] The preparation method of described retarded cement grinding aid, comprises the following steps,

[0018] Step (1): Inject water into the first reaction kettle, add sodium carboxymethyl cellulose while stirring, stir for 15 minutes, and prepare a sodium carboxymethyl cellulose solution with a weight percentage of 1%;

[0019] Step (2): Add citric acid to the remaining water while stirring in the second reaction kettle according to the formula ratio, then add calcium sugar and stir for 10 minutes, and then add the weight percentage prepared in step (1) to the second reaction kettle It is 1% sodium carboxymethyl cellulose solution, stirred for 10 minutes, and then filtered through 150 mesh stainless steel to ob...

Embodiment 2 to Embodiment 4

[0021] Repeat the method of Experimental Example 1 by each component content specified in the following table 1, obtain the retarded cement grinding aid product of different component content respectively,:

[0022] Table 1

[0023] components

Example 1

Example 2

Example 3

Example 4

[0024] Sodium carboxymethyl cellulose(%)

0.01

0.02

0.02

0.01

Calcium sugar (%)

25

27

29

30

Citric acid (%)

10

7

9

5

water(%)

64.99

65.98

61.98

64.99

get

Product 1

Product 2

Product 3

Product 4

[0025] The retarded cement grinding aid products 1 to 4 prepared in Example 1 to Example 4 were used in the mixed material to carry out comparative experiments, wherein the proportion of the mixed material was: clinker 58%, desulfurized gypsum 5% , limestone 8%, fly ash 20%, slag 9%. The experimental results are shown in Table 2:

[0026] Table 2...

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Abstract

The invention discloses a retarded cement grinding aid and a preparation method thereof. The retarded cement grinding aid comprises 0.01-0.02wt% of sodium carboxymethyl cellulose, 25-30wt% of molasses calcium, 5-10wt% of citric acid and the balance of water, wherein the total percent is 100%. The retarded cement grinding aid provided by the invention has the beneficial effects that the molasses calcium is used instead of the molasses and cane sugar commonly used at present, is a powdery product prepared by neutralizing the molasses with lime, has better water reducing and retarding effects than the molasses and saves the cost; and the hydration and hardening time of the cement is effectively lengthened so that the freshly mixed cement concrete can maintain the plasticity in a longer time, thus adjusting the setting time of the freshly mixed cement concrete.

Description

technical field [0001] The invention relates to a retarded cement grinding aid and a preparation method thereof, belonging to the technical field of cement grinding aids. Background technique [0002] Retarding cement grinding aids are mainly used for concrete constructed in hot climates, large-volume concrete, and cement concrete that needs to be parked or transported for a long time. The chemical components of retarded cement grinding aids mainly include: hydroxycarboxylic acids - tartaric acid and its salts, polyhydroxy carbohydrates - sugars and their derivatives, molasses and its modifications, etc., lignosulfonates , inorganic compounds, humic acid water reducers, etc. [0003] Retarding cement grinding aid can prolong the setting time of concrete, make fresh cement concrete maintain plasticity for a long time, which is conducive to pouring and improving construction quality, inhibits the rate of heat release of hydration, slows down the rate of heat release and reduc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/38C04B103/52
Inventor 刘国华唐慧慧
Owner NANJING YONGNENG MATERIALS
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