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

聚羧酸减水剂和含泥量对水泥浆体流变性能的影响

温金保1,2,3,4，杜志芹1,2,3,4，唐修生1,2,3,4，刘兴荣1,2,3,4

2022年第4期

摘要

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摘要：通过测试流动度和由Bingham流变模型拟合所得的流变参数，研究了未掺与掺聚羧酸减水剂（TX50）两种条件下含泥量对水泥浆体流变性能的影响因素及其规律。结果表明：含泥量对水泥浆体塑性黏度的影响程度明显大于其对流动度的影响；水灰比与未掺减水剂的水泥浆体的流动度、塑性黏度、屈服应力分别呈线性关系、幂函数关系、指数关系；减水剂与RP8抑制组分的掺入均可增加水泥浆体的流动度，降低塑性黏度，且对流动度的影响程度明显大于对塑性黏度的影响程度。 Abstract: By testing the fluidity and the rheological parameters fitted by the Bingham rheological model, the influence factors and laws of clay content on the rheological properties of cement paste under the two conditions of not admixed and admixed with polycarboxylic acid water reducer(TX50) were studied. The results show that the effect of clay content on the plastic viscosity of cement paste is significantly greater than its impact on fluidity. The water-cement ratio and the fluidity, plastic viscosity, and yield stress of the cement paste without water reducer are linear, power function, and exponential respectively. The mixing of water reducer and RP8 inhibiting component can increase the fluidity of cement paste and reduce the plastic viscosity, and the impact on fluidity is significantly greater than the impact on plastic viscosity.

温金保,杜志芹,唐修生,等.聚羧酸减水剂和含泥量对水泥浆体流变性能的影响[J].混凝土与水泥制品,2022(4):1-5. WEN J B,DU Z Q,TANG X S,et al.Influence of Polycarboxylic Acid Water Reducer and Clay Content on Rheological Properties of Cement Paste[J].China Concrete and Cement Products,2022(4):1-5.

海洋环境下海水海砂水泥砂浆抗压强度的时变规律

赵雪冰1，李华勇1，陈祖兵1，黄昭宇1，陈宗平1,2

2022年第4期

摘要

引用本文

赵雪冰,李华勇,陈祖兵,等.海洋环境下海水海砂水泥砂浆抗压强度的时变规律[J].混凝土与水泥制品,2022(4):6-9,18. ZHAO X B,LI H Y,CHEN Z B,et al.Time-varying Laws of Compressive Strength of Seawater Sea Sand Cement Mortar in the Marine Environment[J].China Concrete and Cement Products,2022(4):6-9,18.

多壁羧基化碳纳米管改性水泥砂浆抗氯离子渗透性能研究

段艳刚1，朱华2

2022年第4期

摘要

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摘要：研究了一种多壁羧基碳纳米管（CNT-COOH）对水泥砂浆抗氯离子渗透性能的影响。为了得到均匀的悬浮液，将CNT-COOH分散在蒸馏水中，再进行超声波处理。分别按水泥质量的0.01%、0.05%和0.10%的CNT-COOH进行配合设计，制备了水泥砂浆试件，并根据RCM法测定了氯离子扩散系数。结果表明：当CNT-COOH掺量从0.01%增加至0.05%，氯离子扩散深度和扩散系数均增加；但CNT-COOH掺量继续增加至0.10%时，氯离子扩散深度和扩散系数大幅下降。此外，压汞试验结果表明，当CNT-COOH掺量为0.10%时，CNT-COOH通过消除大孔和降低孔隙率细化了孔径，使得水泥砂浆的微观结构更加密实。 Abstract: The effect of multi-walled carbon nanotubes(CNT-COOH) on chloride resistance of cement mortar was studied. In order to obtain a uniform suspension, CNT-COOH was well-dispersed in distilled water and then treated by ultrasonic. The mix proportion of the cement mortar with 0.01%, 0.05% and 0.10% of the cement quality was design, and the chloride diffusion coefficient was determined by the RCM method. The results show that with the increase of CNT-COOH content from 0.05% to 0.05%, the diffusion depth and diffusion coefficient of chloride ion increase, and continuing to increase CNT-COOH content to 0.10%, the diffusion coefficient of chloride has dropped drastically. The results of MIP show that when the CNT-COOH content is 0.10%, CNT-COOH can refine the pore distribution by eliminating the large pore and reducing the porosity, which makes the microstructure of cement mortar compact.

段艳刚,朱华.多壁羧基化碳纳米管改性水泥砂浆抗氯离子渗透性能研究[J].混凝土与水泥制品,2022(4):10-13. DUAN Y G,ZHU H.Study on Chloride Resistance of Cement Mortar Modified with Multi-walled Carboxylated Carbon Nanotubes[J].China Concrete and Cement Products,2022(4):10-13.

页岩陶粒混凝土的制备与保温性能研究

杨航1，戴绍斌1，李正学2，吴思遥1，尚丽诗1

2022年第4期

摘要

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摘要：主要研究了水胶比、页岩陶粒密度等级、含水率三因素对页岩陶粒混凝土的抗压强度和导热系数的影响。结果表明：在一定范围内，水胶比与页岩陶粒混凝土的抗压强度、导热系数分别呈负相关和正相关；页岩陶粒的密度等级与抗压强度、导热系数分别呈正相关和负相关，含水率与抗压强度和导热系数均呈负相关。与普通C30混凝土相比，所制备的LC30页岩陶粒混凝土的干密度降低了25.5%，导热系数降低了50%。 Abstract: The influence of water-binder ratio, shale ceramsite density grade and water content on the compressive strength and thermal conductivity of shale ceramsite concrete was studied. The results show that the water-binder ratio is negatively correlated and positively correlated with the compressive strength and thermal conductivity of shale ceramsite concrete respectively within a certain range. The density grade of shale ceramsite is positively and negatively correlated with the compressive strength and thermal conductivity, respectively, while the water content is negatively correlated with the compressive strength and thermal conductivity. Based on the test results, compared with ordinary C30 concrete, the dry density and thermal conductivity of LC30 shale ceramsite concrete prepared by the optimization are reduced by about 25.5% and 50%.

杨航,戴绍斌,李正学,等.页岩陶粒混凝土的制备与保温性能研究[J].混凝土与水泥制品,2022(4):14-18. YANG H,DAI S B,LI Z X,et al.Study on Preparation and Thermal Insulation Performance of Shale Ceramsite Concrete[J].China Concrete and Cement Products,2022(4):14-18.

机制砂MB值对轨道交通工程用混凝土性能的影响

陈秀鸣1，陈洪2，潘玮璠1，史星祥2，郭耀雄1，许志扬2，张立力2

2022年第4期

摘要

引用本文

摘要：研究了不同母岩岩性、石粉含量、泥粉含量和类型与机制砂MB值的关系，确立了轨道交通工程用混凝土性能的主要影响因素，以实现对机制砂MB值的定量调控。以轨道交通工程典型C20、C35和C50混凝土为研究对象，开展了MB值对其工作性、抗压强度和抗氯离子渗透性的影响研究。结果表明：MB值主要取决于机制砂中的泥粉含量和类型，与母岩岩性和石粉含量的关系不大；MB值的增加会显著降低混凝土的工作性，混凝土强度等级越高对工作性的敏感程度越高，且对掺聚羧酸减水剂混凝土工作性的劣化效果比掺萘系减水剂更显著；当MB值在0.85~2.00之间时，三种混凝土的抗压强度均有不同程度的提升，达到最大值后，抗压强度出现不同程度的下降，C50混凝土的下降幅度最大；适当的MB值可以提高C35混凝土的抗氯离子渗透性；C50混凝土的抗氯离子渗透性会随着MB值的提高而逐渐降低。 Abstract: The relationship between different parent rock lithology, stone powder content, mud powder content and type and MB value of manufactured sand was studied, and the main influencing factors of concrete performance for rail transit engineering were established, so as to realize quantitative regulation of MB value of manufactured sand. Taking the typical C20, C35 and C50 concrete of rail transit engineering as the research object, the effect of MB value on workability, compressive strength and resistance to chloride ion permeability of concrete was studied. The results show that the MB value mainly depends on the content and type of mud powder in the manufactured sand, and has little relationship with the lithology of the parent rock and the content of stone powder. The increase of the MB value will significantly reduce the workability of concrete, and the higher the concrete strength grade, the higher the sensitivity to workability, and the deterioration effect of polycarboxylate superplasticizer on concrete workability is more significant than that of naphthalene-based superplasticizer. When the MB value is between 0.85 and 2.00, the compressive strengths of the three concretes are improved to different degrees, and after reaching the maximum value, the compressive strength decreases to varying degrees, and the C50 concrete has the largest decrease. Appropriate MB value can improve the chloride ion permeability resistance of C35 concrete. The chloride ion permeability resistance of C50 concrete will gradually decrease with the increase of MB value.

陈秀鸣,陈洪,潘玮璠,等.机制砂MB值对轨道交通工程用混凝土性能的影响[J].混凝土与水泥制品,2022(4):19-24. CHEN X M,CHEN H,PAN W F,et al.Effect of MB Value of Manufactured Sand on Performance of Concrete Used in Rail Transit Engineering[J].China Concrete and Cement Products,2022(4): 19-24.

超高性能混凝土（UHPC）研究综述

王晖

2022年第4期

摘要

引用本文

摘要：介绍了超高性能混凝土（UHPC）的基本制备原理、配合比、生产工艺、材料性能以及在国内工程领域的应用概况，对比分析了UHPC和普通混凝土的性能差异，总结了国内UHPC在理论研究和实际应用方面取得的成果，提出了促进UHPC大规模应用急需解决的问题。 Abstract: The basic preparation principle, mix proportion, production process, material properties and application of ultra-high performance concrete (UHPC) in the domestic engineering field are introduced. The performance differences between UHPC and ordinary concrete are compared and analyzed, and the achievements of domestic UHPC in theoretical research and practical application are summarized, and the urgent problems to be solved to promote the large-scale application of UHPC are put forward.

王晖.超高性能混凝土（UHPC）研究综述[J].混凝土与水泥制品,2022(4):25-28. WANG H.Review of Research on Ultra-high Perfoamance Concrete[J].China Concrete and Cement Products,2022(4):25-28.

基于CT图像的混凝土细观损伤数值模拟研究

周双双1，刘京红1,2，李兵兵3，张仕桦4，刘婷5

2022年第4期

摘要

引用本文

摘要：针对混凝土细观损伤机理进行了研究，将混凝土看作由骨料、砂浆和孔隙组成的细观多相复合材料，通过CT技术对其单轴压缩损伤机制进行了分析，并对所得结果处理后通过MIMICS软件建立了相应三维细观模型，结合ABAQUS工具进行了数值模拟研究。结果表明：数值模拟得到的混凝土损伤图可以较好地反映混凝土试件单轴受压的整个损伤过程；混凝土试件在单轴压缩试验中发生的是张拉-剪切复合破坏，数值模拟得到的应力、应变云图与试验结果相符。 Abstract: The mesoscopic damage mechanism of concrete was studied, and concrete was regarded as a meso multiphase composite material composed of aggregate, mortar and pore. The uniaxial compression damage mechanism was analyzed by CT technology. Based on the results, the corresponding 3D mesoscopic model was established by MIMICS software, and then numerical simulation was carried out using ABAQUS software. The results show that the whole damage process of concrete under uniaxial compression can be well reflected by numerical simulation, and the tensile-shear composite failure occurs in the uniaxial compression test. The stress-strain cloud diagram obtained by numerical simulation is consistent with the test results.

周双双,刘京红,李兵兵,等.基于CT图像的混凝土细观损伤数值模拟研究[J].混凝土与水泥制品,2022(4):29-32. ZHOU S S,LIU J H,LI B B,et al.Numerical Simulation Study of Concrete Microscopic Damage Based on CT Image[J].China Concrete and Cement Products,2022(4):29-32.

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