海水海砂制备活性粉末混凝土的碳化机理

doi:10.11896/cldb.19010123

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Abstract In this paper, the carbonation resistance of brine marine sand high performance concrete made from abundant sea sand resources was stu-died.The surface hardness of brine marine sand high performance concrete at different stages of carbonization was studied by means of the durometer, its microscopic composition and morphology were studied by XRD and SEM, and its pH variation was tested by a acidity meter.The results showed that: (1) The carbonation depth of brine marine sand high performance concrete was measured as 0 by using the indicator met-hod, and the actual carbonation depth was found to be within 50—100 μm on the concrete surface by scanning electron microscope test. (2) After 28 days of carbonation, the pH of concrete pore solution decreased significantly, and the pH of concrete pore solution decreased along the direction of CO₂ erosion.The larger pH variation is mainly concentrated within 3 mm from the surface, and the final pH is all above 10.5, greater than the critical value of passivation film disappearance (9.88). The pH of the standard curing specimens is all above 11.50, greater than the critical value of passivation film destruction. (3) Carbonization has little effect on the mechanical properties of brine marine sand high performance concrete, but the deposition of corrosion products on the surface of concrete can increase the surface hardness. (4) The carbonation of brine marine sand high performance concrete is actually the reaction of CO₂ with Ca(OH)₂, C-S-H gel, C₃S, C₂S and Friedel’s salt to generate CaCO₃ and amorphous hydrated SiO₂ covering the original concrete surface, increasing the carbonation resistance of concrete.

Key words： reactive powder concrete sea sand carbonation Rockwell hardness pH

Published: 25 April 2020

CLC number:

TV331

Fund:This work was supported by the Fundamental Research Funds for the Central Universities (2017B05614), the National Natural Science Foundation of China (51709253, 51879093).

About author:: Tianyu Li, Ph.D. candidate, college of Mechanics and Materials, Hohai University. Majoring in civil engineering materials, and mainly engaged in the durability research of concrete.
Weihua Li, professor of Sun Yat-sen University, doctoral supervisor, winners of national outstanding youth fund, ministry of science and technology innovation of middle-aged and young talents, adjunct professor of Tongji University and Hohai University, International Coating Technology Innovation Association Secretary General, Architectural Society of China, deputy director of the Protection and Repair Materials and Application Technology Branch, deputy director of the Nonmetallic Materials Branch of the Chinese Society of Corrosion and Protection,
etc. In the past two decades, based on the national marine strategic needs, professor Li Weihua has carried out cutting-edge and innovative research on the mechanism of induced corrosion and the new technology of defense regulation, aiming at the prominent problem that marine environmental infrastructure is prone to corrosion and degradation.As the project leader, she has successively presided over the national outstanding youth fund, the support program of the ministry of science and technology, the 863 program, etc., and has obtained a series of research results with important scientific significance and engineering application value.

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	LI Tianyu
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Cite this article:

LI Tianyu,LIU Xiaoyan,ZHANG Yumei, et al. Carbonization Mechanism of Reactive Powder Concrete with Sea-water and Sea Sand[J]. Materials Reports, 2020, 34(8): 8042-8050.

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http://www.mater-rep.com/EN/10.11896/cldb.19010123 OR http://www.mater-rep.com/EN/Y2020/V34/I8/8042

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