混凝土研究_2022_《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

铝硅酸盐黏土对超高性能混凝土性能的影响

刘振川1，王辉1，郑渝1，班盛钧1，郑晓博2,3

2022年第12期

摘要

引用本文

摘要：通过测试新拌UHPC的流动度、屈服应力、表观黏度、流变行为指数、坡度保持率、纤维分布系数，研究了铝硅酸盐黏土对UHPC流动性、流变性能、稳定性的影响。结果表明：该黏土能够大幅降低UHPC浆体的流动度，但其对UHPC流动度的影响只与掺量有关，而与所替代的胶凝材料种类无关；掺入黏土增大了UHPC的屈服应力与表观黏度，在2%掺量下，屈服应力和表观黏度分别提高了189.8%和114.0%；掺入黏土改善了浆体的流变性能，使其呈现剪切变稀现象；黏土改善了UHPC的稳定性，其硬化后的坡度保持率可达91.0%，纤维分散系数提升至0.88。 Abstract: By testing the fluidity, yield stress, apparent viscosity, rheological behavior index, slope retention rate and fiber distribution coefficient of fresh UHPC, the influence of aluminosilicate clay on the fluidity, rheological property and stability of UHPC was studied. The results show that the clay can greatly reduce the fluidity of UHPC paste, but its influence on the fluidity of UHPC paste is only related to the content of clay, and is independent of the type of cementitious material it replaces. The yield stress and apparent viscosity of UHPC are increased by 189.8% and 114.0% respectively with 2% clay content. The rheological property of the slurry is improved by adding clay, which makes it appear shear thinning phenomenon. Clay can improve the stability of UHPC, and the slope retention rate after hardening is 91.0%, and the fiber dispersion coefficient is increased to 0.88.

刘振川,王辉,郑渝,等.铝硅酸盐黏土对超高性能混凝土性能的影响[J].混凝土与水泥制品,2022(12):1-5. WANG H,ZHENG Y,BAN S J,et al.Effect of Aluminosilicate Clay on Performance of Ultra-high Performance Concrete[J].China Concrete and Cement Products,2022(12):1-5.

砂率和掺合料对透水混凝土性能的影响

陈建智1，陈晓强1，陈代果1，姚勇1，古巍2，李谦3

2022年第12期

摘要

引用本文

摘要：通过正交试验分析了砂率、粉煤灰、矿粉、硅灰掺量对透水混凝土透水系数、28 d抗压强度的影响。结果表明：在一定范围内，透水混凝土的透水系数随砂率的增大而减小，随着掺合料掺量的增加先增大后减小，透水系数最佳组合为砂率3%、粉煤灰10%、矿粉15%、硅灰5%；透水混凝土的28 d抗压强度随着砂率和粉煤灰掺量的增加先增大后减小，随着矿粉和硅灰掺量的增加而逐渐增大，抗压强度最佳组合为砂率9%、粉煤灰15%、矿粉20%、硅灰6%。 Abstract: The effects of sand ratio, fly ash, mineral powder and silica fume on permeability coefficient and 28 d compressive strength of pervious concrete were analyzed by orthogonal test. The results show that the permeability coefficient of pervious concrete decreases with the increase of sand ratio, and increases first and then decreases with the increase of admixture content. The optimum combination of permeability coefficient is sand ratio 3%, fly ash 10%, mineral powder 15% and silica fume 5%. The 28 d compressive strength of pervious concrete increases first and then decreases with the increase of sand ratio and fly ash content, and gradually increases with the increase of mineral powder and silica fume content. The optimal combination of compressive strength is sand ratio 9%, fly ash 15%, mineral powder 20%, and silica fume 6%.

陈建智,陈晓强,陈代果,等.砂率和掺合料对透水混凝土性能的影响[J].混凝土与水泥制品,2022(12):6-9. CHEN J Z,CHEN X Q,CHEN D G,et al.Effects of Sand Ratio and Admixtures on Properties of Pervious Concrete[J].China Concrete and Cement Products,2022(12):6-9.

晶须、内养护剂、裂缝自修复材料对混凝土性能的影响

张剑峰，程铠，贾洋，周紫晨，张冰

2022年第12期

摘要

引用本文

摘要：研究了硫酸钙晶须、高吸水性树脂（SAP）内养护剂、裂缝自修复材料对混凝土抗折强度、抗压强度的影响，采用正交试验分析了这三种材料在C30和C50混凝土中的最佳掺量，并研究了在最佳掺量下混凝土的塑性抗裂性能。结果表明：在适宜掺量下，三种材料单掺或复配均能提高混凝土各龄期的力学性能；以正交试验得到的三种材料最佳复合比例制备的混凝土的塑性抗裂性能提高了25%以上。 Abstract: The effects of calcium sulfate whisker, super absorbent polymer(SAP) internal curing agent and crack self -healing materials on the compressive strength and flexural strength of concrete were studied. The comprehensive optimum contents of three materials in C30 and C50 concrete were analyzed by orthogonal test, and the influence of the plastic crack resistance of concrete under optimum content was compared. The results show that the mechanical properties of concrete at each age can be improved by single or composite materials with appropriate content, and the plastic crack resistance of the concrete prepared with the optimum composite ratio of the three materials obtained from the orthogonal test is improved by more than 25%.

张剑峰,程铠,贾洋,等.晶须、内养护剂、裂缝自修复材料对混凝土性能的影响[J].混凝土与水泥制品,2022(12):10-13. ZHANG J F,CHENG K,JIA Y,et al.Effects of Whisker, Internal Curing Agent and Crack Self-healing Materials on the Performance of Concrete[J].China Concrete and Cement Products,2022(12):10-13.

海洋围垦工程中混凝土的制备及性能研究

邢则1，曹高俊1，吴炎1，孙林柱2

2022年第12期

摘要

引用本文

摘要：采用普通硅酸盐水泥、矿粉、粉煤灰为胶凝材料，制备了C25、C30、C40普通水泥混凝土试件，研究了该混凝土的劈裂抗拉强度、抗压强度、弹性模量、碳化深度以及氯离子扩散系数，并与以海工水泥为胶凝材料制备的海工混凝土相关性能进行了对比。结果表明：当胶凝材料用量相同时，所制备的普通水泥混凝土基本达到海工混凝土的相关性能要求，可用于海洋围垦环境下相关混凝土工程。 Abstract: The C25, C30, C40 ordinary cement concrete specimens were prepared by using ordinary Portland cement, mineral powder and fly ash as cementitious materials. The splitting tensile strength, compressive strength, elastic modulus, carbonization depth and chloride ion diffusion coefficient were studied. The relative properties of marine concrete prepared with marine cement as cementitious material were compared. The results show that when the amount of cementitious materials is the same, the prepared ordinary cement concrete basically achieves the relevant properties requirements of marine concrete, and can be used for relevant concrete projects in the marine reclamation environment.

邢则,曹高俊,吴炎,等.海洋围垦工程中混凝土的制备及性能研究[J].混凝土与水泥制品,2022(12):14-17. XING Z,CAO G J,WU Y,et al.Preparation and Performance Research of Concrete in Marine Reclamation Engineering[J].China Concrete and Cement Products,2022(12):14-17.

3D打印混凝土的可打印性研究综述

汤寄予1，席义斌1，高丹盈1，杨林1，尤培波2，房栋1

2022年第12期

摘要

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摘要：对国内外3D打印混凝土可打印性的研究现状进行了总结，分析了配合比和原材料组成对3D打印混凝土可打印性的影响，介绍了可打印性的评价方法，并对各评价方法进行了比较，给出了相关建议。 Abstract: The research status of 3D printed concrete printability at home and abroad is summarized. The influence of mix proportion and raw material composition on the printability of 3D printed concrete is analyzed. The evaluation methods of printability are introduced, and a comprehensive comparison and suggestions are made for each evaluation method.

汤寄予,席义斌,高丹盈,等.3D打印混凝土的可打印性研究综述[J].混凝土与水泥制品,2022(12):18-23. TANG J Y,XI Y B,GAO D Y,et al.Review on Printability of 3D Printed Concrete[J].China Concrete and Cement Products,2022(12):18-23

轻骨料混凝土高温力学性能劣化机理研究

郭佳栋1，郭荣鑫2，3，黄会明1

2022年第12期

摘要

引用本文

摘要：测试了高温后轻骨料混凝土（LWC）的力学性能，探究了聚丙烯纤维掺量、高温温度（100、300、500、700、900 ℃）和冷却方式对LWC高温力学性能的影响，分析了LWC高温力学性能的劣化机理。结果表明：掺入适量的聚丙烯纤维可以提高LWC的残余抗压强度；在100~300 ℃和500~900 ℃区间温度时，各试件的烧失率增幅较大；经100 ℃高温后，喷水冷却的LWC残余抗压强度优于自然冷却的LWC，但经300 ℃高温后，相比于自然冷却，喷水冷却的LWC残余抗压强度降低幅度更大；自然冷却的LWC在300 ℃时出现较少裂缝，在500 ℃时裂缝快速发展；由于砂浆与骨料热膨胀系数的差异，喷水冷却使基体-骨料界面裂缝快速发展，LWC在300 ℃时便形成较多裂缝，故残余抗压强度降低幅度更大。 Abstract: The mechanical properties of the lightweight aggregate concrete(LWC) after high temperature were tested. The influences of polypropylene fiber content, high temperature(100、300、500、700、900 ℃) and cooling method on the high temperature mechanical properties of the LWC were explored, and its deterioration mechanism of high temperature mechanical properties was analyzed. The results show that adding proper amount of polypropylene fiber can improve the residual compressive strength of the LWC. At the range of 100~300 ℃ and 500~900 ℃, the loss on ignition rate of each specimen increases greatly. After being subjected to a high temperature of 100 ℃, the residual compressive strength of the LWC cooled by water spray is better than that of the natural cooling, but after 300°C, the residual compressive strength of the LWC cooled by the water spray has a greater decrease in strength compared to the natural cooling. For the naturally cooled LWC, the cracks are formed after a high temperature of 300 ℃, and the cracks develop rapidly after a high temperature of 500 ℃. Due to the difference in thermal expansion coefficient between mortar and aggregate, rapid cooling causes rapid development of mortar-aggregate interface cracks. Therefore, for the LWC cooled by water spray, the formation of large cracks can accelerate at 300 ℃, so the residual compressive strength decreases faster.

郭佳栋,郭荣鑫,黄会明.轻骨料混凝土高温力学性能劣化机理研究[J].混凝土与水泥制品,2022(12):24-27,45. GUO J D,GUO R X,HUANG H M.Study on Deterioration Mechanism of Lightweight Aggregate Concrete at High Temperature[J].China Concrete and Cement Products,2022(12):24-27,45.

不同养护温度对再生混凝土性能的影响

艾洪祥1，刘洋1，郑海康1，李绍纯2，岳彩虹1，宁江萌1

2022年第12期

摘要

引用本文

摘要：研究了在低湿环境下，不同养护温度（-40、-20、0、20、40、60 ℃）对再生混凝土工作性、力学性能、耐久性能的影响。结果表明：当养护温度为40 ℃时，再生混凝土28 d的抗压强度最佳，相比于常温（20 ℃）养护下的抗压强度提高了17%；过低或过高的养护温度都会对再生混凝土的抗裂性能造成影响；温度为40 ℃时的养护效果最优，试件内部密实度高，再生混凝土的耐久性能好。 Abstract: The effects of different curing temperatures (-40, -20, 0, 20, 40, 60 ℃) on the workability, mechanical properties and durability of recycled concrete in low humidity environment were studied. The results show that when the curing temperature is 40 ℃, the compressive strength of recycled concrete at 28 d is the best, which is 17% higher than that at room temperature(20 ℃). Too low or too high curing temperature will affect the anti cracking performance of recycled concrete. The curing effect is optimal when the temperature is 40 ℃, the internal compactness of the specimen is high, and the durability of recycled concrete is good.

艾洪祥,刘洋,郑海康,等.不同养护温度对再生混凝土性能的影响[J].混凝土与水泥制品,2022(12):28-31. ZHENG H K,LI S C,YUE C H,et al.Effect of Different Curing Temperatures on the Properties of Recycled Concrete[J].China Concrete and Cement Products,2022(12):28-31.

氯离子多维传输下混凝土的耐久性能研究进展

林金宗

2022年第12期

摘要

引用本文

摘要：介绍了氯离子在混凝土中的侵蚀机理，论述了氯离子多维传输作用对混凝土结构的影响，比较了几种氯离子多维传输模型的应用范围与不足，讨论了不同因素对氯离子多维传输的影响。在氯盐环境下，针对混凝土耐久性能的研究方向，提出了建立氯离子传输数据库、增加试验准确性、拓展模型适用范围、改进氯离子测定方法等建议。 Abstract: The erosion mechanism of chloride ions in concrete is introduced, the impact of concrete structure on the chloride ion multi-dimensional transmission function is studied, the several transmission models of multi-dimensional application of chlorine ion and deficiency are compared, the influence of different factors on the chloride ion multi-dimensional transmission is disscused. In the chloride environment, according to the research direction of concrete durability, some suggestions are put forward, such as establishing a chloride ion transmission database, increasing the accuracy of the test, expanding the scope of application of the model, and improving the determination method of chloride ion.

林金宗.氯离子多维传输下混凝土的耐久性能研究进展[J].混凝土与水泥制品,2022(12):32-36. LIN J Z.Research Progress of Concrete Durability Under Multi-dimensional Chloride Ion Transport[J].China Concrete and Cement Products,2022(12):32-36.

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