苏州混凝土水泥制品研究院有限公司

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发布时间:2020-01-06 00:00:00
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混凝土研究

原材料氯离子含量对硬化混凝土中氯离子总量的影响
原材料氯离子含量对硬化混凝土中氯离子总量的影响
  • 张琨健1,2
2021年第12期
摘要
引用本文
摘   要:通过分析混凝土中各原材料的氯离子含量,研究了不同氯离子含量的砂样和水样、不同养护龄期以及不同强度等级对新拌混凝土及硬化混凝土中氯离子总量的影响。结果表明:随着砂、水中氯离子含量的增加,混凝土拌合物及硬化混凝土中氯离子含量显著增加;混凝土硬化后随着龄期的增长,其氯离子含量呈下降趋势;当砂中氯离子含量超出规定时,混凝土中的氯离子总量容易超标,即使混凝土其他原材料氯离子含量都达标,硬化后的氯离子含量也仍可能超标;随着混凝土强度等级的提高,混凝土中的氯离子总量明显降低;各原材料的氯离子含量计算总量接近且略高于新拌混凝土实测氯离子含量,可采用计算混凝土各原材料中氯离子含量的方法预测硬化混凝土中氯离子总量是否超标。 Abstract: Through the analysis of the Cl- content of various raw materials in concrete, the impact of sand samples and water samples with different Cl- content and different curing ages, different strength grades on the total Cl- content in concrete mixtures of and hardened concrete were studied. The results show that as the Cl- content in sand or water increases, the Cl- content in the concrete mixture and hardened concrete increases significantly. After hardening, as the curing age increases, the Cl- content of the concrete shows a downward trend. When the Cl- content in the sand exceeds the standards, the Cl- content in the concrete easily exceeds the target. Even if the Cl- content of each raw material of concrete meets the standard, the Cl- content of the concrete may still exceed the standard after hardening. With the improvement of concrete design strength grade, the Cl- content in the concrete decreases significantly. The calculated values of total Cl- content of each raw material is close to and slightly higher than the test values of chloride ion content of fresh concrete. The method of calculating the total amount of Cl- in each raw material of concrete can be used to determine whether the Cl- content in hardened concrete exceeds the standard.
张琨健.原材料氯离子含量对硬化混凝土中氯离子总量的影响[J].混凝土与水泥制品,2021(12):24-28. ZHANG K J.Influence of Cl- Content of Raw Materials to Cl- Content in Hardened Concrete[J].China Concrete and Cement Products,2021(12):24-28.
基于孔结构特征的透水混凝土性能研究进展
基于孔结构特征的透水混凝土性能研究进展
  • 黄冬辉1,崔 璨1,汤斐宇1,赵海涛2,赵 晖3
2021年第12期
摘要
引用本文
摘   要:基于国内外现有研究成果,总结了透水混凝土孔结构特征的表征方法,综述了孔结构特征对透水混凝土透水性能和力学性能的影响以及透水混凝土的透水性能和力学性能之间的关系,并对进一步研究方向进行了展望。 Abstract: Based on existing research results at home and abroad, the characterization method of the pore structure characteristics of permeable concrete is summarized. The influence of pore structure characteristics on the water permeability and mechanical properties of permeable concrete and the relationship between the water permeability and mechanical properties of permeable concrete are reviewed, and further research directions are prospected.
黄冬辉,崔璨,汤斐宇,等.基于孔结构特征的透水混凝土性能研究进展[J].混凝土与水泥制品,2021(12):20-23. HUANG D H,CUI C,TANG F Y,et al.Review on the Pervious Concrete Performance Based on the Pore Structure Characteristics[J].China Concrete and Cement Products,2021(12):2021(12):20-23.
混凝土断裂能尺寸效应研究综述
混凝土断裂能尺寸效应研究综述
  • 卜静武1,刘雨夕1,徐 颖2
2021年第12期
摘要
引用本文
摘   要:对近年来国内外有关混凝土断裂能尺寸效应的研究成果进行了总结与讨论,介绍了混凝土断裂能的试验方法,并针对三点弯曲梁法和楔入劈拉法获得的数据分别进行了分析,讨论了试件高度、宽度、缝高比、跨高比、韧带高度、韧带面积对混凝土断裂能的影响。此外,针对现有研究中存在的不足,提出了下一步研究的方向。 Abstract: The experimental results on the size factors on the fracture energy of concrete in recent years are summarized and discussed. The concrete fracture energy test methods are introduced, and the data obtained by the three-point bending beam method and the wedge splitting method are analyzed respectively. The different influencing factors, such as specimen height, width, seam-to-height ratio, span-to-height ratio, ligament height, ligament area on the fracture energy of concrete are discussed through the data obtained by the three-point bending test and wedge splitting test. In addition, based on the problems in the existing research, the future research direction is proposed.
卜静武,刘雨夕,徐颖.混凝土断裂能尺寸效应研究综述[J].混凝土与水泥制品,2021(12):16-19,28. BU J W,LIU Y X,XU Y.Research Review on the Size Effect of Fracture Energy of Concrete[J].China Concrete and Cement Products,2021(12):2021(12):16-19,28.
隧道湿喷高性能喷射混凝土配合比试验研究
隧道湿喷高性能喷射混凝土配合比试验研究
  • 张 戈1,安明喆1,王 月1,王 靖2,黄良贤1,刘俊元2
2021年第12期
摘要
引用本文
摘   要:基于回弹率、强度和耐久性的要求,进行了胶凝材料用量、水胶比及砂率对喷射混凝土性能影响的试验研究。结果表明:水胶比影响着喷射混凝土的内聚力和黏附力,是影响回弹率的最主要因素;受工作性和施工工艺的影响,胶凝材料用量是影响喷射混凝土1 d和28 d抗压强度的主要因素;当胶凝材料用量为540 kg/m3、水胶比为0.38、砂率为50%、硅灰掺量为15%时,可制备出回弹率为8.2%,28 d抗压强度为71.2 MPa,电通量为133 C,抗冻等级大于F300,28 d碳化深度为2 mm的高性能喷射混凝土。 Abstract: Based on the requirements of rebound rate, strength and durability, the experimental study on the influence of the content of cementitious materials, water-binder ratio and sand ratio on the performance of shotcrete was carried out. The results show that the water-binder ratio affects the cohesion and adhesion of shotcrete, which is the most important factor affecting the rebound rate. Affected by workability and construction technology, the content of cementitious materials is the main factor affecting the compressive strength of shotcrete at 1 d and 28 d. The high-performance shotcrete with dosage of cementitious material is 540 kg/m3, water-binder ratio is 0.38, sand ratio is 50% and silica fume content is 15% has excellent properties. Its rebound rate is 8.2%, the 28 d compressive strength is 71.2 MPa, the electric flux is 133 C, and the frost resistance level is greater than F300, and the 28 d carbonation depth is 2 mm.
张戈,安明喆,王月,等.隧道湿喷高性能喷射混凝土配合比试验研究[J].混凝土与水泥制品,2021(12):12-15,28. ZHANG G,AN M Z,WANG Y,et al.Experimental Study on Mix Proportion of High Performance Wet-mix Shotcrete in Tunnel[J].China Concrete and Cement Products,2021(12):12-15,28.
高性能水泥基灌浆料的制备及研究
高性能水泥基灌浆料的制备及研究
  • 蒋 涛1,廖开星2,潘从玲1,俞 锋1,韩玉春1,吴剑剑2,彭先兵1
2021年第12期
摘要
引用本文
摘   要:研究了细骨料种类和级配、膨胀剂掺量对高性能水泥基灌浆料性能的影响,并对比分析了缓凝剂掺量及掺入方式对其实际应用效果的影响。结果表明:采用河砂作为细骨料制备的灌浆料能够保持较好的流动性,但其强度低于采用石英砂或机制砂作为细骨料的灌浆料;当膨胀剂掺量为2%时,灌浆料的竖向膨胀率能够满足GB/T 50448—2015《水泥基灌浆材料应用技术规范》的要求;两种缓凝剂复掺的效果优于单掺,复掺0.8‰缓凝剂RA+0.8‰缓凝剂RB可明显延长Ⅳ类灌浆料的凝结时间,且30 min经时扩展度损失较小,对强度的影响也较小,能够满足实际工程要求。 Abstract: The effects of different fine aggregate, gradation and expansive agent content on the performance of cement-based high-performance grouting material were studied, and the practical application effects of retarder content and mixing mode in grouting material were compared and analyzed. The results show that when river sand is used as fine aggregate, the grouting material can maintain good fluidity, but its strength is lower than that of grouting material with quartz sand or machine-made sand as fine aggregate. When the content of expansion agent is 2%, the vertical expansion rate of grouting material can meet the requirements of GB/T 50448—2015 The Application Requirements of Technical Code for Application of Cement-based Grouting Materials. The effect of the two retarders is better than that of the single retarder. The compound addition of 0.8‰ retarder RA+0.8‰ retarder RB can significantly prolong the setting time of Ⅳ grouting material and has little impact on the strength, so it can be well applied to practical projects.
蒋涛,廖开星,潘从玲,等.高性能水泥基灌浆料的制备及研究[J].混凝土与水泥制品,2021(12):6-11. JIANG T,LIAO K X,PAN C L,et al.Study on Preparation and Application of High Performance Cement-based Grouting Material[J].China Concrete and Cement Products,2021(12):6-11.
模拟混凝土孔隙溶液pH值对钢筋表面钝化膜的影响
模拟混凝土孔隙溶液pH值对钢筋表面钝化膜的影响
  • 林崇雄
2021年第12期
摘要
引用本文
摘   要:通过自腐蚀电位、电化学阻抗谱和线性极化曲线测试研究了模拟混凝土孔隙溶液pH值(13.5、12.5、11.5)对钢筋表面钝化膜的影响。结果表明:三种测试方法得出的结论基本一致,相同Cl-含量的模拟混凝土孔隙溶液pH值越高,钢筋表面钝化膜腐蚀破坏越小;提高孔隙溶液的pH值,能显著提高钢筋表面钝化膜的耐腐蚀性能;通过预钝化处理钢筋和提高混凝土孔隙溶液的碱性,可显著提高混凝土工程中钢筋的抗腐蚀性能。 Abstract: The influence of the pH value(13.5、12.5、11.5) of the simulated concrete pore solution on the passive film of steel bar was studied by the corrosion potential, electrochemical impedance spectroscopy and linear polarization curves tests. The results show that the three kinds of test methods have the same conclusion basically. The passive film on the surface of the steel bar has lower corrosion trend in the simulated concrete pore solution with same chloride ion content and higher pH value. By improving the alkalinity of the pore solution, the corrosion resistance of the passive film on the surface of the steel rebar can be significantly improved. By pre-passivating the steel bar and improving the alkalinity of the concrete pore solution, the corrosion resistance of the steel bars in the concrete can be significantly enhanced.
林崇雄.模拟混凝土孔隙溶液pH值对钢筋表面钝化膜的影响[J].混凝土与水泥制品,2021(12):1-5,11. LIN C X.Influence of pH Value of Simulated Concrete Pore Solution on Passive Film of Steel Bar[J].China Concrete and Cement Products,2021(12):1-5,11.
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