Additive for improving early strength of white cement and preparation method and application of additive
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An early strength and admixture technology, which is applied in the field of preparation of admixtures to improve the early strength of white cement, can solve the problems of white cement strength shrinkage, strength shrinkage, and large dosage
Pending Publication Date: 2020-10-27
XINYANG LINGSHI TECH CO LTD +1
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But white C in mineral phase of cement 3 A and C 4 The content of AF is very low, resulting in low early strength of white cement, and conventional alcohol amine accelerators have no stimulating effect on the strength of white cement, traditional alcohol amine substances can also lead to shrinkage of white cement strength, early strength of inorganic salt components There are problems such as large dosage, efflorescence, and later strength shrinkage
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Embodiment 1
[0019] Get 15 parts of phosphonoglycolic acid, 15 parts of hydroxyethylidene diphosphonic acid, 10 parts of tetrasodium aminotrimethylene phosphonate, 10 parts of sodium thiocyanate and 50 parts of water.
[0020] Add water to the reaction kettle, then add tetrasodium aminotrimethylene phosphonate and sodium thiocyanate, fully dissolve and stir evenly, then add phosphonoglycolic acid and hydroxyethylenediphosphonic acid dropwise, and continue stirring after the dropwise addition 15 minutes to get the finished product.
Embodiment 2
[0022] Get 15 parts of phosphonoglycolic acid, 15 parts of hydroxyethylene diphosphonic acid, 10 parts of ethylenediamine tetramethylene phosphonic acid, 5 parts of tetrasodium aminotrimethylene phosphonate, 6 parts of sodium thiocyanate and 49 parts of water.
[0023] Add water to the reaction kettle, then add tetrasodium aminotrimethylene phosphonate and sodium thiocyanate, fully dissolve and stir evenly, then add dropwise phosphonoglycolic acid, hydroxyethylene diphosphonic acid, ethylenediamine tetramethylene Phosphonic acid, after the dropwise addition, continued to stir for 15 minutes to obtain the finished product.
Embodiment 3
[0025] Get 15 parts of ethylenediamine tetramethylene phosphonic acid, 8 parts of disodium hydroxyethylidene diphosphonate, 10 parts of tetrasodium aminotrimethylene phosphonate, 10 parts of sodium thiocyanate and 57 parts of water.
[0026] Add water to the reaction kettle, then add tetrasodium aminotrimethylene phosphonate, tetrasodium aminotrimethylene phosphonate, sodium thiocyanate, fully dissolve and stir evenly, then add ethylenediamine tetramethylene phosphonic acid dropwise, drop Continue stirring for 15 minutes after the addition to obtain the finished product.
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Abstract
The invention discloses an additive for improving early strength of white cement, a preparation method and application thereof, and belongs to the technical field of additives. The additive is mainlycomposed of phosphonoglycolic acid, Hydroxyethylidene-1,1-diphosphonic acid, ethylenediamine tetramethylene phosphonic acid, disodium hydroxyethylidene diphosphonate, tetrasodium aminotrimethylene phosphonate, sodium thiocyanate and water; through the chelating effect of organic phosphonate ions with an extremely strong chelating effect in the additive and calcium ions, the concentration of soluble calcium ions of white cement in hydrated slurry is increased, and then the dissolution and hydration rates of mineral components of the white cement are promoted, and the effect of improving the early strength of the white cement is achieved; the addition amount of the additive is 0.03%-0.2% of the weight of the white cement, and the 1-day strength and the 3-day strength can be improved by 5-15%.
Description
technical field [0001] The invention belongs to the technical field of white cement admixtures, in particular to an admixture for improving the early strength of white cement, a preparation method and an application thereof. Background technique [0002] White Portland cement is a hydraulic cementitious material made by grinding white Portland cement clinker with less iron oxide content, appropriate amount of gypsum and mixed materials (limestone and kiln dust), referred to as white cement, and is mainly used in construction. Decoration of objects, such as floors, stairs, steps and exterior wall finishes, colored terrazzo and terrazzo manufacturing, finishing mortar, artificial stone cutting, cement roughening process, marble and tile inlays, concrete sculpture products, etc. White cement is mainly used in decoration projects and requires excellent early strength. But white C in mineral phase of cement 3 A and C 4 The content of AF is very low, resulting in low early stre...
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