混凝土研究_2020_《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

渗透型有机硅对砂浆耐生物腐蚀性的影响

郁慕贤

2020年第8期

摘要

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摘要：通过分析污水半浸环境下涂敷有机硅和未涂敷有机硅的砂浆质量、抗压强度、矿物组成、微观结构变化，研究了涂敷渗透型有机硅对砂浆耐生物腐蚀效果的影响。研究结果表明，涂敷渗透型有机硅能显著改善污水半浸环境下砂浆的耐生物腐蚀性。当腐蚀龄期为240 d时，未涂敷有机硅试样腐蚀前后质量的变化率为0.51%，抗压强度为30.8 MPa。涂敷有机硅试样腐蚀前后质量的变化率为0.31%，抗压强度为39.5 MPa。 Abstract: By analyzing the quality, compressive strength, mineral composition, and microstructure changes of uncoated silicone and coated silicone mortar in a semi-immersed sewage environment, the effect of coated infiltration silicone on the bio-corrosion resistance of the mortar was studied. The results show that the application of permeable silicone can significantly improve the bio-corrosion resistance of the mortar in the semi-immersion environment of sewage. When the corrosion age is 240 d, the mass change rate of the uncoated silicone sample before and after corrosion is 0.51%, and the compressive strength is 30.8 MPa. The mass change rate of the coated silicone sample before and after corrosion is 0.31%, and the compressive strength is 39.5 MPa.

郁慕贤.渗透型有机硅对砂浆耐生物腐蚀性的影响[J].混凝土与水泥制品,2020(8):27-29. YU M X.Effect of Permeable Silicone on Bio-corrosion Resistance of Mortar[J].China Concrete and Cement Products,2020(8):27-29.

聚羧酸系减水剂对水泥砂浆塑性毛细管负压的影响研究

王冬1,2,3,4，石明建2,3,4，祝烨然1,2,3,4

2020年第8期

摘要

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摘要：主要研究了不同类型聚羧酸系减水剂对水泥砂浆塑阶段性毛细管负压发展的影响。试验结果表明，保坍型和超保坍型聚羧酸减水剂不仅对砂浆流动度损失性能改善明显，而且对砂浆塑性阶段毛细管负压增长速率也有减缓作用。对于C30混凝土筛出的低强度等级水泥砂浆，保坍型聚羧酸减水剂相对于减水型聚羧酸减水剂能延缓自由水释放，有效降低砂浆初凝前塑性阶段毛细管负压的增长速率，降低砂浆塑性开裂风险。对于C50混凝土筛出的高强度等级水泥砂浆，超长保坍聚羧酸减水剂降低砂浆初凝前塑性阶段毛细管负压的增长速率有限，与缓凝剂配合可实现有效控制砂浆塑性开裂。 Abstract: The influence of different types of polycarboxylate superplasticizer on the development of the cement mortar capillary depression at plastic stage was studied. The experimental results show that the polycarboxylate superplasticizer with keeping slump and the super keeping slumps not only improve the performance of mortar fluidity loss, but also slow down the mortar plastic capillary depression growth rate. For the cement mortar of low grade screened out from the C30 concrete, compared the polycarboxylate superplasticizer with water reducing with the polycarboxylate superplasticizer with keeping slump can release free water effectively and reduce mortar plastic capillary depression growth rate before initial setting mortar, and reduce the risk of mortar plastic cracking. For the cement mortar of the high grade screened out from the C50 concrete，the polycarboxylate superplasticizer with super keeping slumps reduces mortar plastic capillary depression growth rate before initial setting mortar is limited, and the combination of retarder can effectively control the risk of mortar plastic cracking.

王冬,石明建,祝烨然.聚羧酸系减水剂对水泥砂浆塑性毛细管负压的影响研究[J].混凝土与水泥制品,2020(8):23-26. WANG D,SHI M J,ZHU Y R.The Influence of Polycarboxylate Superplasticizer on Capillary Depression of Cement Mortar at Plastic Stage[J].China Concrete and Cement Products,2020(8):23-26.

氧化石墨烯分散方式及其对水泥砂浆力学性能的影响

袁小亚1，高军2，王远贵1，魏致强2，曾俊杰1，郑旭煦1

2020年第8期

摘要

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摘要：在饱和氢氧化钙水溶液中，采用木质素磺酸钙（木钙）作为助分散剂协同聚羧酸减水剂（PC）对氧化石墨烯（GO）进行分散，并通过吸光度、原子力显微镜、Zeta电位、SEM和XRD等研究了木钙对GO的分散效果及复掺对水泥砂浆力学性能的影响。结果表明：较PC单独分散GO，额外加入少量木钙能大幅度改善GO的稳定分散能力；当GO掺量为0.03%、木钙与GO的质量比为3∶1时，较于PC单独分散GO试件(即基准试件)，助分散下GO掺配的水泥砂浆试件的3 d抗压强度、抗折强度分别提升了40.9%和22.5%，28 d抗压强度、抗折强度分别提升了22.1%和17.2%；相对于基准试件，木钙助分散下掺配GO的砂浆内部结构更密实；木钙与PC具有优异的协同分散GO的功效。 Abstract: In saturated calcium hydroxide aqueous solution, calcium lignosulfonate (CL) was used as a co-dispersant and polycarboxylic acid water reducer (PC) to disperse graphene oxide (GO), and through absorbance, atomic force microscopy, Zeta Potential, SEM and XRD were used to study the dispersing effect of wood calcium on GO and the effect of compounding on the mechanical properties of cement mortar. The results show that compared with PC dispersing GO alone, adding a small amount of wood calcium can greatly improve the stable dispersing ability of GO. When the GO content is 0.03% with 3∶1 mass ratio of CL to GO, the 3 d compressive and flexural strength of cement mortar specimens mixed with GO co-dispersed by PC and CL is increased by 40.9% and 22.5%, respectively, as comparison with those of only PC-dispersed GO specimens. 28 d compressive and flexural strength of the cement mortar specimens is increased by 22.1% and 17.2%. The crystal growth of the hydration products of cement is more uniform and the overall internal structure is more compact at the case of the blending of GO co-dispersed by the addition of CL. CL and PC have an excellent synergy on the dispersion of GO.

袁小亚,高军,王远贵,等.氧化石墨烯分散方式及其对水泥砂浆力学性能的影响[J].混凝土与水泥制品,2020(8):18-22,26. YUAN X Y,GAO J,WANG Y G,et al.Dispersion Method of Graphene Oxide and Its Effect on Mechanical Properties of Cement-based Materials[J].China Concrete and Cement Products,2020(8):18-22,26.

飞机拦阻系统用超轻质混凝土组成设计研究

方俊，王振地，王玲

2020年第8期

摘要

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摘要：为保持飞机拦阻系统用超轻质混凝土溃缩强度的长期稳定，设计了“P·I水泥+惰性掺合料”胶凝材料体系，基于超轻质混凝土的干密度及溃缩强度的变化规律，确定了关键制备参数的适宜取值范围，研究了超轻质混凝土的孔结构特征。结果表明，“P·I水泥+重质碳酸钙”体系下超轻质混凝土在60 d后溃缩强度基本保持稳定，重质碳酸钙掺量为63.0%~64.3%时，超轻质混凝土60~150 d溃缩强度变化率为0.93%~7.08%，压溃曲线平台段应力偏差为±4.98%~±9.70%。发泡剂和稳泡剂的推荐掺量分别为4.4%、5.0%，稳泡剂能优化超轻质混凝土孔径分布。适宜水胶比为0.54~0.56，提高水胶比可能增加气孔的数量。 Abstract: In order to control the long-term stability of crushing strength of ultra-lightweight concrete used in Engineered Material Arresting System (EMAS), the cementing material system of "P·I cement+inert additive" was designed. Based on the dry density and crushing strength of ultra-lightweight concrete, the appropriate values of inert additive and other key preparation parameters were determined, and the pore structure characteristics of ultra-lightweight concrete was also studied. The results show that under the "P·I cement+heavy calcium carbonate" system, the crushing strength of ultra-lightweight concrete remains basically stable after 60 d. When the dosage of heavy calcium carbonate is 63.0%~64.3%, the change rate of crushing strength from 60 d to 150 d is 0.93%~7.08%, and the stress deviation of the platform segment is ±4.98%~±9.70%. The recommended dosage of foaming agent and foam stabilizer is 4.4% and 5.0% respectively. Foam stabilizer can optimize the pore size distribution of ultra-lightweight concrete. The suitable water- binder ratio is 0.54~0.56. And the increase of water-binder ratio can enlarge the number of pores.

方俊,王振地,王玲.飞机拦阻系统用超轻质混凝土组成设计研究[J].混凝土与水泥制品,2020(8):12-17. FANG J,WANG Z D,WANG L.Mix Proportion Design of Ultra-lightweight Concrete for Engineered Material Arresting System[J].China Concrete and Cement Products,2020(8):12-17.

3D打印混凝土层间性能影响因素与测试方法研究综述

於家勉，孙元峰，姚一鸣，鲁聪

2020年第8期

摘要

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摘要：结合国内外研究案例，深入分析了打印工艺、砂浆配合比等3D打印混凝土层间性能的影响因素。在此基础上，进一步探讨了3D打印混凝土层间强度的提高方式。同时总结了抗拉试验、抗剪试验、微观结构分析等层间强度测试方法并分析了各自优缺点。 Abstract: Based on the review of domestic and foreign researches, factors affecting the interlayer bonding of 3D printed concrete were analyzed, such as mix proportion of mortar and printing process. The existing methods of improving the interlayer bonding of 3D printed concrete were summarized. Finally, bonding test methods such as tensile test, shear test and microstructural analysis were compared and summarized.

於家勉,孙元峰,姚一鸣,等.3D打印混凝土层间性能影响因素与测试方法研究综述[J].混凝土与水泥制品,2020(8):7-11,17. YU J M,SUN Y F,YAO Y M,et al.The Review of Research on Influencing Factors and Test Methods of Interlayer Performance of 3D Printed Concrete China[J].Concrete and Cement Products,2020(8):7-11,17.

我国商品砂浆技术发展现状及展望

王培铭

2020年第8期

摘要

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摘要：从历史回顾、产品分类、生产技术、应用技术、支撑体系（标准制定、科学研究、学术交流）等方面论述了我国商品砂浆的发展、技术现状及展望，并针对我国商品砂浆产业在技术上存在的问题，提出了研发方向和建议。 Abstract: The development, technical status and prospect of the commercial mortar are discussed from the aspects of historical review, product classification, production technology, application technology, supporting system (standard setting, scientific research, academic exchange), etc. In view of the technical problems in commercial mortar industry in China, several research and development directions and suggestions are put forward.

王培铭.我国商品砂浆技术发展现状及展望[J].混凝土与水泥制品,2020(8):1-6. WANG P M.Development Status and Prospect of Commercial Mortar Technology in China[J].China Concrete and Cement Products,2020(8):1-6.

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