有机膦酸类化合物在混凝土工程中的应用及缓凝机理研究进展

doi:10.11896/cldb.19060153

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Abstract Reducing the cumulative hydration heat and heat evolution rate of the cementitious system by the means of adding an admixture with hydration heat inhibition is an important measure to reduce the temperature cracks in the concrete. Organic phosphonic acid compounds have more effective hydration heat inhibition and retardation effects on Portland cement. In the past few decades, organic phosphonic acid has been widely used in industrial and civil construction engineering, oil field cementing engineering and some concrete projects with special requirements. The application of organic phosphonic acid compounds in China is mainly concentrated in oilfield cementing concrete engineering. In recent years, it has also been more and more popular applied in civil engineering concrete projects, but the scope and extent of application are still very limited. In summary, organic phosphonic acid compounds have the following characteristics:(1) they can greatly reduce the cumulative hydration heat and heat evolution rate within a certain dosage. (2)They aren't sensitive to changes in cement clinker content, and they have good adaptability with Portland cement, polycarboxylate water reducer and naphthalene water reducer.(3) They can improve the performance of concrete mix and improve the long-term mechanical properties of concrete at a certain dosage ranges. (4) The main chain structure of organic phosphonic acid compounds have high temperature stability, and the applicable temperature is above 200 ℃. They can maintain strong retarding effect on Portland cement at a higher temperature.
The effect of organic phosphonic acid compounds on the hydration of Portland cement is complicated, and the mechanism of retardation of Portland cement is not very clear. Different scholars hold different views on this.One of the views proposes that it firstly promotes the dissolution of Ca²⁺ in the cement, promotes the hydration of the cement mineral on the surface of the aluminum-rich layer, and promotes the hydration of the tricalcium aluminate (C₃A). Then, they form a semi-permeable stable chelate on the surface of tricalcium silicate (C₃S) in combination with Ca²⁺, which inhibits the hydration of C₃S and inhibits further hydration of cement. Another point of view proposes that the organophosphonic acid compound effectively inhibits the nucleation and growth process of ettringite gel to crystal transformation, and it believes that delaying the growth of ettringite crystals is the main cause of retardation of Portland cement.
In this paper, the application of organic phosphonic acid compounds in concrete engineering is summarized. The study progress of organic phosphonic acid compounds on hydration kinetics and retardation mechanisms of Portland cement are also summarized.Based on this, in order to further expand the application range of organic phosphonic acid compounds in concrete engineering, it is proposed to further study the effects of organic phosphonic acid compounds on the mechanical properties, volume stability, thermodynamic properties and durability of concrete.And the effect of organic phosphonic acid compounds on hydration kinetics of Portland cement and its retardation mechanism are further studied.

Key words： organic phosphonic acid compounds cement and concrete hydration kinetics inhibition mechanism

Published: 14 July 2020

CLC number:

TU528

Fund:This work was financially supported by the Central Non-profit Scientific Research Fund for Institutes (CKSF2019200/CL) and China Three Gorges Corporation Research Project (BHT0807).

About author:: Xingdong Lyu received his master degree from Wuhan University of Technology in 2015. He is an engineer in Changjiang River Scientific Research Institute of Changjiang Water Resources Commission.He is mainly engaged in the research of hydraulic concrete and solid waste recycling. He is headed over a fund of the Central Non-profit Scientific Research Fund for Institutes Undergranted. In addition, he participated in one National Key R & D Program of China and two funds of the Natural Science Foundation of China. He assumes reviewer of journals like Journal of Cleaner Production and Journal of Yangtze River Scientific Research Institute. He has published 5 papers of SCI,4 papers of EI or CPCI, 9 papers of Chinese language core periodical and obtained 4 national invention patents.

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Cite this article:

LYU Xingdong,WANG Xuebin,LI Beixing. Research Progress on Application of Organic Phosphonic Acid Compounds in Concrete Engineering and Their Retarding Mechanism[J]. Materials Reports, 2020, 34(15): 15184-15189.

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http://www.mater-rep.com/EN/10.11896/cldb.19060153 OR http://www.mater-rep.com/EN/Y2020/V34/I15/15184

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