混凝土研究_2023_《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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混凝土研究

复合黏度改性剂对C60清水混凝土性能的优化分析

姜骞1，夏鹏飞2，徐文1，潘利1

2023年第2期

摘要

引用本文

摘要：自主研发了一种复合黏度改性剂（CVMA），研究了掺量为0~15%的CVMA对C60桥塔清水混凝土新拌性能、硬化性能和外观质量的影响。结果表明：掺10%的CVMA可降低清水混凝土倒置坍落度筒排空时间56.9%，并提高了混凝土的力学和耐久性能；掺入CVMA可以改善清水混凝土的气泡稳定性、优化气泡结构，从而减少清水混凝土的外观气泡缺陷，同时可抑制色差缺陷，达到清水混凝土外观质量要求。 Abstract: A composite viscosity modifier admixture(CVMA) was developed to improve performance of C60 fair-faced concrete for bridge pylon. The influence of CVMA content 0~15% on fresh, mechanical properties, durability and appearance quality of fair-faced concrete was investigated. The results show that fresh property is improved as a reduction of 56.9% in flow time from the inverted slump cone with 10% content of CVMA in fair-faced concrete, and improves the mechanical and durability properties. The addition of CVMA can improve the bubble stability of fair-faced concrete, optimize the bubble structure, thus improving the appearance of bubbles and color difference defects of fair-faced concrete, and meeting the appearance quality requirements of fair-faced concrete.

姜骞,夏鹏飞,徐文,等.复合黏度改性剂对C60清水混凝土性能的优化分析[J].混凝土与水泥制品,2023(2):1-4,14. JIANG Q,XIA P F,XU W,et al.Optimization Analysis of Composite Viscosity Modifier Admixtures on Performance of C60 Fair-faced Concrete[J].China Concrete and Cement Products,2023(2):1-1-4,14.

低回弹高早强喷射混凝土技术与工程应用

王家赫1,2，谢永江1,2，冯仲伟1,2，谭盐宾1,2，李化建1,2，李享涛1,2，仲新华1,2

2023年第2期

摘要

引用本文

摘要：为降低喷射混凝土施工回弹率、提高其早期力学性能和长期耐久性能，结合铁路隧道复合式衬砌结构体系对喷射混凝土的性能要求，研发了喷射混凝土用功能材料，并提出低回弹高早强喷射混凝土制备技术。通过试验室试验和工程应用案例，验证了该功能材料配制技术的可行性和使用效果。试验室试验结果表明：喷射混凝土的施工回弹率与其流变参数密切相关，所研发的功能材料与速凝剂复掺可显著提高喷射混凝土的早期力学性能和耐久性能，并降低施工回弹率。工程应用结果表明：采用本文提出的技术后，所制备的隧道初支喷射混凝土的施工回弹率≤10%，喷射混凝土8 h抗压强度≥10 MPa，24 h抗压强度≥15 MPa，56 d电通量＜1 200 C，满足隧道高性能混凝土的施工要求。 Abstract: In order to reduce the rebound rate of shotcrete construction, improve the early mechanical properties and long-term durability, combined with the performance requirements of the composite lining structure system of railway tunnels for shotcrete, functional materials for shotcrete were developed, and the preparation technology of low rebound and high early strength shotcrete was proposed. The feasibility and application effect of the preparation technology of functional materials were verified through laboratory and engineering applications. The laboratory test results show that the rebound rate of shotcrete construction is closely related to its rheological parameters. The developed functional materials and accelerator can significantly improve the early mechanical properties and long-term durability of shotcrete, and reduce the construction rebound rate. The engineering application results show that after adopting the technologies proposed, the construction rebound rate of shotcrete for initial tunnel support is≤10%, the compressive strength of shotcrete for 8 h is≥10 MPa, the compressive strength for 24 h is≥15 MPa, and the 56 d electric flux is ＜1 200 C, which can meet the construction requirements of tunnel high-performance concrete.

王家赫,谢永江,冯仲伟,等.低回弹高早强喷射混凝土技术与工程应用[J].混凝土与水泥制品,2023(2):5-9. WANG J H,XIE Y J,FENG Z W,et al.Technology and Engineering Application of Shotcrete with Low Rebound and High Early Strength[J].China Concrete and Cement Products,2023(2):5-9.

偏高岭土对水泥基复合材料抗氯离子侵蚀性能的影响

王军平

2023年第2期

摘要

引用本文

摘要：研究了偏高岭土（MK）对水泥基复合材料的氯离子固化能力和抗氯离子渗透性的影响。试验结果表明：掺入MK能够提高水泥基复合材料的氯离子固化能力，改善抗氯离子渗透性；当MK掺量为15%时，水泥基复合材料的氯离子固化率和抗氯离子渗透性最佳。XRD和DTG分析表明：MK能够通过参与水泥水化反应生成无机聚合物凝胶和Friedel盐，从而提高对氯离子的固化能力；孔结构分析验证了MK的填充效应可有效降低和延缓氯离子在水泥基复合材料中的迁移，优化了孔径分布，降低了孔隙率。 Abstract: The effect of highly active metakaolin (MK) on chloride curing ability and chloride penetration resistance of cement-based composites was studied. The results show that the addition of MK can improve the chloride ion curing ability of cement-based composites, and improve the resistance to chloride ion penetration. When the content of MK is 15%, the chloride ion curing rate and chloride ion penetration resistance of cement-based composite are the best. XRD and DTG results show that MK can produce inorganic polymer gel and Friedel’s salt by participating in the cement hydration reaction, thus improving the chloride ion curing ability. The pore structure analysis verifies that the filling effect of MK can effectively reduce and delay the migration of chloride ions in the cement-based composite, optimize the pore size distribution and reduce the porosity.

王军平.偏高岭土对水泥基复合材料抗氯离子侵蚀性能的影响[J].混凝土与水泥制品,2023(2):10-14. WANG Jun-ping.Effect of Metakaolin on Chloride Ion Erosion Resistance of Cement-based Composites[J].China Concrete and Cement Products,2023(2):10-14.

温度匹配养护对大体积混凝土耐久性能的影响

张平1，郑海康1，刘洋1，古龙龙1，马旭东1，陈旭2

2023年第2期

摘要

引用本文

摘要：在胶凝材料总量、水胶比以及复合矿物掺合料总量不变的前提下，通过调整矿物掺合料（粉煤灰、矿粉）掺配比例，研究了温度匹配养护下大体积混凝土的抗压强度和耐久性能，并与标准养护下的性能测试结果进行了对比分析。结果表明：温度匹配养护显著加速了混凝土的水化进程，使粉煤灰、矿粉的化学活性较早地发挥出来，混凝土内部结构变得更为致密，在一定程度上改善了混凝土的抗硫酸盐侵蚀性能和抗氯离子渗透性能。 Abstract: Under the premise that the total amount of cementitious materials, water binder ratio and total amount of composite mineral admixtures remain unchanged, the compressive strength and durability of mass concrete under temperature matched curing were studied by adjusting the proportion of mineral admixtures(fly ash and mineral powder), and the results were compared with those under standard curing. The results show that temperature matched curing significantly accelerates the hydration process of concrete, makes the chemical activity of fly ash and mineral powder play out earlier, and the internal structure of concrete becomes more compact, which improves the sulfate corrosion resistance and chloride ion penetration resistance of concrete to a certain extent.

碳化硼对铁矿石混凝土亚高温后性能的影响研究

侯景鹏1，魏浩然2

2023年第2期

摘要

引用本文

摘要：以5%的碳化硼等质量取代褐铁矿砂，制备了强度等级C50和密度等级RS2的铁矿石防辐射混凝土，研究了其在不同亚高温温度下的热工性能以及145 ℃处理5 d前后力学及耐久性能，分析了碳化硼在亚高温前后对铁矿石混凝土性能的影响规律和机理。结果表明：碳化硼的掺入提高了铁矿石混凝土的比热容、导热系数、热扩散系数、抗折强度，但降低了铁矿石混凝土的表观密度、抗压强度；亚高温后，碳化硼的填充效果明显，优化了气泡参数，提高了铁矿石混凝土微观结构的稳定性，有利于减缓铁矿石混凝土耐久性能劣化过快的情况，维持铁矿石混凝土亚高温后的防辐射稳定性。 Abstract: Iron ore anti radiation concrete with strength grade C50 and density grade RS2 was prepared by replacing limonite ore sand with 5% boron carbide. The thermal performance at different sub-high temperature and the mechanical and durability properties of iron ore concrete before and after being treated at 145 ℃ for 5 d were studied. The influence of boron carbide on the performance of iron ore concrete before and after sub-high temperature was analyzed. The results show that the addition of boron carbide improves the specific heat capacity, thermal conductivity, thermal diffusion coefficient and flexural strength of iron ore concrete, but reduces the apparent density and compressive strength of iron ore concrete. After sub-high temperature, the filling effect of boron carbide is obvious, which optimizes the bubble parameter, improves the stability of the microstructure of iron ore concrete, helps to slow down the deterioration of the durability of iron ore concrete, and maintains the radiation stability of iron ore concrete after sub-high temperature.

侯景鹏,魏浩然.碳化硼对铁矿石混凝土亚高温后性能的影响研究[J].混凝土与水泥制品,2023(2):19-22. HOU J P,WEI H R.Study on the Influence of Boron Carbide on the Properties of Iron Ore Concrete After Sub-high Temperature[J].China Concrete and Cement Products,2023(2):19-22.

EPEG缓释型聚羧酸减水剂的常温制备与性能研究

刘少兵1，程绍娟1，陈森章2，林海阳2，崔珊珊2，杨国武3

2023年第2期

摘要

引用本文

刘少兵,程绍娟,陈森章,等.EPEG缓释型聚羧酸减水剂的常温制备与性能研究[J].混凝土与水泥制品,2023(2):23-27. LIU S B,CHENG S J,CHEN S Z,et al.Preparation and Properties of EPEG Slow-release Polycarboxylate Superplasticizerat at Room Temperature[J].China Concrete and Cement Products,2023(2):23-27.

混凝土疲劳性能研究综述

周泉1，马可2

2023年第2期

摘要

引用本文

摘要：从混凝土劈拉疲劳、疲劳损伤、黏结滑移本构模型三个角度总结了混凝土疲劳性能的研究进展，发现斜向配箍和加入钢纤维都可以提高混凝土的抗疲劳性能。比较了三种疲劳损伤理论，其中，概率疲劳损伤理论较符合实际，可以用来计算循环荷载下的损伤累计值，另外，对比分析了国内外几种可信度较高的黏结滑移本构模型，发现这些模型趋势大致相同，但峰值存在差异，并提出了引起差异的因素。 Abstract: The research progress of fatigue properties of concrete is reviewed from three aspects of concrete splitting fatigue, fatigue damage and bond slip constitutive models. It is concluded that both oblique stirrup and steel fiber can improve the fatigue properties of concrete. 3 fatigue damage theories are compared. The probabilistic fatigue damage theory is more practical and can be used to calculate the cumulative damage value under cyclic loading. By comparing several bond slip constitutive models with higher reliability at home and abroad, it is concluded that the trends of these models are roughly the same, but the peak values are different and the factors causing the difference are put forward.

周泉,马可.混凝土疲劳性能研究综述[J].混凝土与水泥制品,2023(2):28-32,37. ZHOU Q,MA K.A Review of Fatigue Properties of Concrete[J].China Concrete and Cement Products,2023(2):28-32,37.

石墨烯-羧基化碳纳米管水泥基复合材料的高温力学性能研究

王小凡，朱华，赵乙丁，鲍溢

2023年第2期

摘要

引用本文

摘要：测试了不同质量比的石墨烯-羧基化碳纳米管（G-CNT）水泥基复合材料在25、200、400、600 ℃下的质量损失、抗压强度和抗折强度。结果表明：400 ℃以内，添加G-CNT复合材料后水泥基复合材料的残余力学性能显著提高，对质量损失的影响较小，水泥基复合材料的耐高温性能提高；400 ℃时，掺入0.10%CNT和0.05%G的水泥基复合材料的抗压强度仅下降了21.43%；400~600 ℃时，结合XRD和SEM结果可知，水泥基复合材料的微观结构严重破坏，力学性能显著下降；G5C10组为最佳配比，25~400 ℃时，在最佳配比下，G、CNT复掺后可以延缓或抑制因为高温爆裂引起的微孔隙和裂缝的扩散，形成致密化结构，进而提高水泥基复合材料的耐高温性能。 Abstract: The effects of different mass ratio of graphene-carboxylated carbon nanotubes(G-CNT) on the mass loss and mechanical properties of cement-based composites at 25, 200, 400 and 600 ℃ were studied. The results show that within 400 ℃, the residual mechanical properties of cement-based composites are significantly improved after adding G-CNT composites, but the impact on mass loss is small, and the high temperature resistance of cement-based composites is improved. At 400 ℃, the compressive strength of cement-based composites with 0.10% CNT and 0.05% G decreases by only 21.43%. At 400~600 ℃, combined with XRD and SEM results, it can be seen that the microstructure of cement-based composites is seriously damaged and its mechanical properties are significantly reduced. G5C10 is the optimal ratio. At 25~400 ℃, under the optimal ratio, G-CNT can delay or inhibit the diffusion of micropores and cracks caused by high temperature explosion, and form a densified structure, thereby improving the high temperature resistance of cement-based composites.

王小凡,朱华,赵乙丁,等.石墨烯-羧基化碳纳米管水泥基复合材料的高温力学性能研究[J].混凝土与水泥制品,2023(2):33-38. WANG X F,ZHU H,ZHAO Y D,et al.Study on Mechanical Properties of Graphene-carboxylated Carbon Nanotube Cement-based Composites at High Temperature[J].China Concrete and Cement Products,2023(2):33-38.

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