Retarder matched with magnesia expansive agent and preparation method thereof

A technology of expansion agent and retarder, which is applied in the field of retarder and its preparation, can solve the problems of loss of reactivity of magnesium oxide expansion agent, decrease of expansion performance, and difficulty in use, so as to achieve expansion performance without being weakened and improve fluidity The effect of maintaining ability and purchasing convenience

CN103058549BActive Publication Date: 2014-07-02JIANGSU SOBUTE NEW MATERIALS +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2014-07-02

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Abstract

The invention relates to a set retarder compatible with a magnesium oxide expansion agent, which is prepared by mass percentage of the following substances: 5%~10% of ammonium oxalate; 10%~20% of ammonium phosphate; 20%~20% of ammonium citrate 30%; the balance is water. The invention also relates to a preparation method of the retarder. The retarder compatible with the magnesia expansion agent provided by the present invention can not only improve the initial fluidity of the cement slurry mixed with the magnesia expansion agent, but also can significantly improve the fluidity retention ability of the cement slurry after 60 minutes, and has excellent retarding effect; it can delay the early hydration of magnesia expansion agent, improve the work performance of magnesia concrete, and not reduce the reactivity of magnesia expansion agent, so as to ensure that its expansion performance is not weakened; The preparation method of the retarder compatible with the magnesium expansion agent has the characteristics of convenient procurement of raw materials, simple and easy preparation process, and convenient popularization and application.
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Description

technical field

[0001] The invention belongs to the technical field of concrete admixtures, and in particular relates to a retarder compatible with a magnesium oxide expansion agent and a preparation method thereof. Background technique

[0002] After the concrete is poured, due to the large amount of heat of hydration generated by the hydration of the cement, the temperature of the concrete rises, resulting in volumetric thermal expansion. After reaching the maximum temperature, as the heat dissipates to the external environment, the temperature will drop from the maximum value to a stable or quasi-stable value, and temperature shrinkage stress will be generated. When the shrinkage stress exceeds the ultimate tensile strength of concrete, it will lead to concrete cracking . In the construction of water conservancy and hydropower projects, the temperature shrinkage crack of mass concrete is one of the key factors affecting the quality and durability of the project. Chinese...

Examples

Embodiment 1

[0026] Add the following raw materials into the reaction kettle according to their mass percentages, and mix and stir evenly at room temperature to prepare the retarder:

[0027] Ammonium oxalate 5%;

[0028] Ammonium phosphate 20%;

[0029] Ammonium Citrate 30%;

[0030] Water 45%.

Embodiment 2

[0032] Add the following raw materials into the reaction kettle according to their mass percentages, and mix and stir evenly at room temperature to prepare the retarder:

[0033] Ammonium oxalate 8%;

[0034] Ammonium phosphate 15%;

[0035] Ammonium Citrate 27%;

[0036] Water 50%.

Embodiment 3

[0038] Add the following raw materials into the reaction kettle according to their mass percentages, and mix and stir evenly at room temperature to prepare the retarder:

[0039] Ammonium oxalate 10%;

[0040] Ammonium phosphate 10%;

[0041] Ammonium citrate 20%;

[0042] Water 60%.

[0043] In the present invention, the retarder is added to the cementitious material, and the influence of the retarder on the fluidity and retarding effect of the cementitious slurry is evaluated by the slurry test, and the test method of the fluidity of the cementitious slurry is referred to GB8077-2000 " The relevant provisions of the "Concrete Admixture Homogeneity Test Method" are implemented, and the test method of the setting time of the cementitious slurry is implemented in accordance with the relevant provisions of GB / T1346-2011 "Cement Standard Consistency Water Consumption, Setting Time, and Stability Test Method".

[0044] In the application examples of the present invention, the a...