A chemical additive for calcium sulphoaluminate-modified Portland cement comprises the following substances: (a) at least one alkanolamine borate; (b) at least one organic alcohol; and (c) at least one saccharide or a derivative thereof; and the substances and water are sequentially mixed and stirred to obtain the chemical additive for calcium sulphoaluminate-modified Portland cement. The chemical additive for calcium sulphoaluminate-modified Portland cement provided by the invention has better effects of regulating the setting time of the calcium sulphoaluminate-modified Portland cement and improving the 3d/28d strength increase rate, and also has a grinding aid effect when being added during grinding.

Chemical additive for calcium sulphoaluminate-modified portland cement

The invention discloses a liquid cement-setting retarding enhancer. The liquid cement-setting retarding enhancer comprises the following constituents: mixed alcohol, sodium nitrite, sodium gluconate, sodium tripolyphosphate, malt syrup, and triethanolamine. The liquid cement-setting retarding enhancer disclosed by the invention can be used for Portland cement to prolong the cement setting time obviously and improve the early strength and the long-term strength of the cement.

Liquid cement-setting retarding enhancer

The invention discloses a novel-structure cement retarder and application thereof. The novel-structure cement retarder comprises a chemical component with a cyclic amino organic phosphonic acid structure, is used in the preparation processes of concrete, mortar and grouting, is applicable to a wide mixing amount and is capable of replacing conventional retarders such as gluconates or melbine, thecuring retarding time can be controlled by adjusting amounts of the retarder, and thus the time interval from curing start to curing stopping is short.

Novel-structure cement retarder and application thereof

The invention specifically relates to a composite additive capable of substantially prolonging the setting time of phosphate cement without influencing the strength and durability of the phosphate cement, belonging to the technical field of additives for phosphate cement. The phosphate cement has the characteristic of a fast setting speed; however, problems in application of the phosphate cement have not been overcome so far, so the phosphate cement has not gain enough attention and research for a long time. The composite additive provided by the invention comprises 25 to 45% of 3-methyl-3-oxetanemethanol and 55 to 75% of tetramethylammonium tetrafluoroborate, and the percentages of the above-mentioned components sum to 100%; the doping amount of the additive is 0.8 to 2.0% of the total weight of magnesium oxide and potassium dihydrogen phosphate, setting time can be adjusted by controlling the doping amount; and the additive has the characteristics of a low doping amount, good adjusting effect, low cost, etc.

Retarder for phosphate cement and application method thereof

The invention discloses an inorganic cementing material retarding method. Various organic and inorganic composite retarding systems are introduced in phosphate cementing material, and particularly heterocyclic compounds are introduced to serve as an efficient retarder. The components used as the retarder in the retarding method comprise the heterocyclic compounds, polyhydric alcohol and derivatives thereof, hydroxyl carboxylic acid and salt thereof, amino carboxylic acid and salt thereof and inorganic salt. Organic retarders such as the heterocyclic compounds, polyhydric alcohol and derivatives thereof, hydroxyl carboxylic acid and salt thereof, and amino carboxylic acid and salt thereof are added on the basis of conventional inorganic salt retarder, and the mixing amount of the retarder is controlled within 5% (relative to the quality of magnesium oxide), so that the retarding effect is stably improved, and the initial setting time of the phosphate cementing material is controllable within 1.5 hours; and meanwhile, according to the retarding effect, the early compressive strength of the phosphate cementing material is not affected, the later compressive strength of the phosphate cementing material to improve with the delay of the age is not affected, and the excellent adhesiveness and adhesion of the phosphate cementing material are not affected.

Inorganic cementing material retarding method

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Inorganic cementing material retarding method