节能与环保_2021_《混凝土与水泥制品》杂志社

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发布时间：2020-01-06 00:00:00

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节能与环保

离子侵蚀对再生混凝土多重界面区（ITZ）性能的影响

宫尧尧1，李楠2，张蕾3，班顺莉1，岳公冰4，高嵩1

2021年第2期

摘要

引用本文

摘要：通过研究氯离子和硫酸根离子侵蚀下再生混凝土不同界面过渡区的显微结构以及显微硬度变化，揭示了离子侵蚀对再生混凝土结构和性能的影响机理。结果表明：再生混凝土经氯离子侵蚀后，骨料老界面、骨料新界面、砂浆新界面的显微硬度逐渐降低，过渡区宽度逐渐增加；氯离子侵蚀前后，同种界面过渡区显微硬度值随着新浇筑砂浆强度等级的增加而增大，且氯离子扩散系数与界面过渡区宽度成正相关性；硫酸根离子侵蚀再生混凝土的界面过渡区宽度有所增加，显微硬度降低，界面区的致密性下降。 Abstract: The microstructure and micro-hardness changes of different interface transition zones of recycled concrete eroded by chloride ion and sulfate ion were studied to reveal the effect mechanism of ion erosion on the structure and performance of recycled concrete. The results show that the micro-hardness of the old aggregate interface, the new aggregate interface and the new interface of mortar gradually decreases and the width of the transition zone gradually increases after the chlorine ion erosion of the recycled concrete. Before and after chloride ion erosion, the micro-hardness of the same interface transition zone increases with the increase of the strength grade of the newly poured mortar, and the chloride ion diffusion coefficient has a positive correlation with the width of the interface transition zone. The width of the interfacial transition zone of the recycled concrete eroded by sulfate ion increases. The micro-hardness decreases, and the compactness of the interfacial zone decreases.

宫尧尧,李楠,张蕾,等.离子侵蚀对再生混凝土多重界面区（ITZ）性能的影响[J].混凝土与水泥制品,2021(2):91-96. GONG Y Y, LI N,ZHANG L,et al.Effect of Ion Erosion on Interface Transition Zone Performance of Recycled Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(2):91-96.

过硫磷石膏矿渣水泥混凝土的研究与应用进展

水中和1，吴赤球2，孙涛1，吕伟2

2021年第2期

摘要

引用本文

摘要：讨论了高掺量磷石膏矿渣胶凝材料体系的化学反应原理和微观结构形成机理，介绍了以该胶凝材料体系为基础制备生态低碳水泥混凝土及相关制品的关键技术。分析了高掺量磷石膏基轻骨料的研制及其在道路基层中应用的最新进展。并基于高掺量磷石膏基水泥混凝土及其制品存在的问题，对其发展前景进行了展望。 Abstract: The chemical reaction principle and microstructure formation mechanism of the high-volume phosphogypsum slag cement material system are discussed, and the key technologies for preparing ecological low-carbon cement concrete and related products based on the cement material system are introduced. The latest development of the development of high-volume phosphogypsum-based lightweight aggregate and its application in road base are analyzed. Based on the problems of high-volume phosphogypsum-based cement concrete and its products, its development prospects are prospected.

水中和,吴赤球,孙涛,等.掺稻壳灰/硅灰混凝土的性能研究[J].混凝土与水泥制品,2021(2):97-100. SHUI Z H,WU C Q,SUN T,t al.RResearch and Application Progress of Excess-sulfate Phosphogypsum Slag Cement ConcreteJ].CHINA CONCRETE AND CEMENT PRODUCTS,2021(2):97-100.

掺稻壳灰/硅灰混凝土的性能研究

王刚1,2

2021年第2期

摘要

引用本文

摘要：研究了稻壳灰、硅灰、稻壳灰+粉煤灰、硅灰+粉煤灰对混凝土抗压强度、抗折强度、抗硫酸侵蚀能力和抗碳化能力的影响。结果表明：掺加5%~10%稻壳灰或硅灰有助于提升混凝土的抗压强度和抗折强度，且稻壳灰、硅灰掺量越高抗压强度越高，掺硅灰混凝土相对于掺稻壳灰混凝土的抗压和抗折强度更高，掺稻壳灰+粉煤灰、硅灰+粉煤灰试件的抗压和抗折强度低于基准组；稻壳灰相较于硅灰能更好地降低混凝土的干密度，而硅灰相较于稻壳灰能更好地降低试件的吸水率，粉煤灰的摻入会降低试件的干密度，但吸水率明显增加；掺加稻壳灰、硅灰有助于提升试件的抗硫酸侵蚀能力，且硅灰的提升效果优于稻壳灰，掺入粉煤灰后试件的抗硫酸侵蚀能力进一步提高；掺稻壳灰、硅灰试件的抗碳化能力均优于基准组，且硅灰的改善效果优于稻壳灰，而掺入粉煤灰的试件抗碳化性能最差。 Abstract: The effects of rice husk ash, silica fume, rice husk ash+fly ash, silica fume+fly ash on compressive strength, flexural strength, sulfuric acid resistance and carbonation resistance of concrete were studied. The results show that the addition of 5%~10% rice husk ash or silica fume can improve the compressive strength and flexural strength of concrete, and the higher the content of rice husk ash or silica fume, the greater the compressive strength. The compressive strength and flexural strength of the specimens with rice husk ash+fly ash or silica fume+fly ash are lower than those of blank group. Rice husk ash has a better ability to reduce the dry density of concrete than silica fume, while silica fume has a better role in reducing the water absorption than rice husk ash. The addition of fly ash will reduce the dry density of concrete, but the water absorption is significantly increased. Adding rice husk ash or silica fume can improve the sulfuric acid resistance of concrete, and the improvement effect of silica fume is better than that of rice husk ash, and the sulfuric acid resistance of concrete is further improved after adding fly ash. The carbonation resistance of the specimens with rice husk ash or silica fume is better than that of blank group, and the improvement effect of silica fume is better than that of rice husk ash, while the carbonation resistance of the specimens with fly ash is the worst.

王刚.掺稻壳灰/硅灰混凝土的性能研究[J].混凝土与水泥制品,2021(2):101-104. WANG G.Properties of Concrete Mixed with Rice Husk Ash or Silica Fume[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(2):101-104.

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