Chloride-free enhanced slump-retaining cement grinding aid and preparation method thereof
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A cement grinding aid and slump-preserving technology, which is applied in the field of cement additives, can solve the problems of unsustainable cement strength, affecting the use effect of concrete, and the lack of obvious strength effect of cement in the later stage.
Active Publication Date: 2018-12-25
UNIV OF JINAN
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At present, cement grinding aids used in China are divided into two types: liquid and powder, and the effect on cement is single. The strength cannot last; the common problem at present is that in order to reduce the cost of cement production, the cement plant will give full play to the characteristics of cement clinker, the cement is ground very finely or the mixed materials of poor quality are used, resulting in poor adaptability of cement. The time loss is large, and the slump performance of cement is poor, which seriously affects its use in concrete, and most of the existing products contain chloride ions that corrode building steel bars, and have an impact on building volume stability Sulfates seriously affect the durability of buildings
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[0041] The present invention also provides a preparation method of the chlorine-free enhanced cement grinding aid described in the above technical solution, comprising the following steps:
[0042] 1) Weigh raw materials: diethanol monoisopropanolamine, triethanolamine, sodium formate, organic phosphonate retarder, polymer dispersant, molasses, and the remaining water;
[0043] 2) Add the water in step 1) into the mixing tank, stir, slowly add sodium formate to dissolve it completely, and continue stirring to obtain a sodium formate solution;
[0044] 3) Add diethanol monoisopropanolamine, triethanolamine, organic phosphonate retarder, and polymer dispersant in sequence to the sodium formate solution in step 2), and stir to obtain a mixed solution;
[0045] 4) Add molasses to the mixed solution in step 3), and stir to obtain cement grinding aid.
[0046] Preferably, the stirring time of step 3) is 2 min.
[0047] Preferably, the stirring time of step 4) is 5 minutes.
Embodiment 1
[0050] Prepare cement grinding aid, its composition raw material is by weight: 5 parts of diethanol monoisopropanolamine, 8 parts of triethanolamine, 15 parts of sodium formate, 1 part of disodium hydroxyethylidene diphosphonate, 1 part of polyepoxysuccinic acid parts, molasses 2 parts, water 68 parts;.
Embodiment 2
[0052] Prepare cement grinding aid, its composition raw material is by weight: 5 parts of diethanol monoisopropanolamine, 8 parts of triethanolamine, 15 parts of sodium formate, 1 part of potassium hydroxyethylidene diphosphonate, 1 part of sodium polyepoxysuccinate 1 part, 2 parts molasses, 68 parts water.
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Abstract
The invention provides a chloride-free enhanced slump-retaining cement grinding aid which comprises, by weight, 2-8 parts of diethanolisopropanolamine, 6-20 parts of triethanolamine, 10-25 parts of sodium formate, 0.5-2 parts of organic phosphonate retarders, 0.5-2 parts of polymeric dispersing agents, 2-4 parts of green syrup and the rest water. The grinding aid has the advantages that the diethanolisopropanolamine, the triethanolamine and the sodium formate are used in a matched manner, the early strength and the later strength of cement are remarkably improved, the organic phosphonate retarders and the polymeric dispersing agents are used in a matched manner, so that the cement has excellent slump-retaining performance, adaptability between the cement and a concrete additive is good, the early strength and the later strength of the cement are improved by 3-5MPa in actual use process, adaptability among the cement, a naphthalene water reducer, an aliphatic water reducer and a polycarboxylic acid water reducer is good, the cement paste fluidity cannot be lost within 2 hours, and the grinding aid does not contain any chloride ions and sulfate ions, is free from toxicity and corrosiveness, green and environmentally friendly and cannot damage to human bodies, buildings and the like.
Description
technical field [0001] The invention relates to the technical field of cement additives, in particular to a chlorine-free reinforced slump-preserving cement grinding aid and a preparation method thereof. Background technique [0002] Cement production is a typical high-pollution and high-energy-consuming industry. Under the general trend of pursuing green GDP, energy conservation and emission reduction are required. As an innovative application technology product, cement grinding aid can improve cement production efficiency, reduce energy consumption, and improve Cement quality, reduce the mixing ratio of conveying materials. At present, cement grinding aids used in China are divided into two types: liquid and powder, and the effect on cement is single. The strength cannot last; the common problem at present is that in order to reduce the cost of cement production, the cement plant will give full play to the characteristics of cement clinker, the cement is ground very finel...
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