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

低速搅拌下高水胶比压浆料的制备及其性能研究

沈贵阳1，樊俊江2，於林锋3

2020年第11期

摘要

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摘要：研究了低速搅拌、高水胶比下，减水剂、硅灰、粉煤灰及膨胀剂对压浆料的流动性、泌水率以及抗压强度等性能的影响规律，在此基础上优化了配合比，制备了普通低速搅拌下高水胶比压浆料。试验结果表明，在转速低于300 r/min、0.42高水胶比情况下，可以制备出初始流动度为25.5 s、不泌水、各项性能均满足实际工程应用要求的预应力孔道压浆材料。该制备技术在简化施工工艺的同时降低材料成本约231 元/吨，对促进预应力孔道压浆材料的技术改进具有重要的意义。 Abstract: The effects of high water-binder ratio, water reducing agent, silica fume, fly ash and expansion agent on the flowability, water bleeding rate and compressive strength of duct grouts under low-speed stirring were studied. On this basis, the mix proportion was optimized to prepare a high water-binder ratio duct grouts under ordinary low-speed stirring. The results show that under low-speed stirring at a speed lower than 300 r/min and a high water-binder ratio of 0.42, a prestressed channel grouting material with an initial fluidity of 25.5 s, no bleeding and performance that meets the requirements of practical engineering applications can be prepared. This preparation technology reduces the material cost by about 231 yuan/t while simplifying the construction process, which is of great significance to the technical improvement of the prestressed channel grouting material.

沈贵阳,樊俊江,於林锋.低速搅拌下高水胶比压浆料的制备及其性能研究[J].混凝土与水泥制品,2020(11):30-34. SHEN G Y,FAN J J,YU L F.Study on Preparation and Properties of High Water-Binder Duct Grouts Under Low-speed Stirring[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(11):30-34.

重晶石混凝土动态压缩性能研究

马宇昂1，甘元初1，曾泽强1，雷晴1，陈龙1，贺斌2

2020年第11期

摘要

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摘要：为了研究中高应变率下重晶石混凝土的动态压缩力学性能，采用了?覫100 mm霍普金森（SHPB）压杆系统，在5种冲击气压下，对3种强度等级的重晶石混凝土、普通混凝土进行了对比试验。试验结果表明：重晶石混凝土与普通混凝土类似，各项力学特性均具有应变率效应；相同加载条件下，随着强度等级的提高，试件脆性增强、延性减弱、峰值应变降低较明显；此外，对照普通混凝土拟合了重晶石混凝土的动态增大系数（DIF）率型公式。 Abstract: In order to study the dynamic compression mechanical properties of barite concrete at medium and high strain rates, ?覫100 mm hopkinson pressure bar (SHPB) system was used. Under 5 kinds of impact pressure, comparative experiments were performed on barite concrete and ordinary concrete with 3 kinds of strength grades. The experimental results show that barite concrete is similar to ordinary concrete, and its mechanical properties have strain rate effect. Under the same loading condition, with the increase of strength grade, the brittleness of the specimens increases, ductility decreases, and the peak strain decreases significantly. In addition, contrast ordinary concrete, the dynamic coefficient of increase (DIF) formula of barite concrete is summarized.

马宇昂,甘元初,曾泽强,等.重晶石混凝土动态压缩性能研究[J].混凝土与水泥制品,2020(11):26-29,34. MA Y A,GAN Y C,ZENG Z Q,et al.Study on the Dynamic Compressive Properties of Barite Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(11): 26-29,34.

不同释放时间保坍型聚羧酸高性能减水剂研究

王倩1，王立彬1，任建波1，张露瑶1，张业明2，刘禹杉1，肖见祺1

2020年第11期

摘要

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摘要：以丙烯酸羟乙酯、丙烯酸羟丙酯、封端酰胺磷酸酯和甲基丙烯基酒石酸单酯为功能单体，通过对这几种功能单体缓释特点进行分类，科学地设计了聚羧酸减水剂的分子结构，制备了三种不同释放时间的保坍型聚羧酸高性能减水剂（即早期释放型、中期释放型和中后期释放型）。采用凝胶色谱仪对三种保坍型减水剂进行了GPC分析，研究了其释放规律以及对不同特征水泥的适应性，并在混凝土实际工程中验证了设计方法的正确性。 Abstract: With hydroxyl ethyl acrylate, hydroxypropyl acrylate, terminated amide phosphate and methyl allyl tartaric acid monoester for modification monomer, through the analysis of the characteristics of the several kinds of modified monomer slow-release classification, the molecular structure of high performance polycarboxylate superplasticizer was scientifically designed. Three different release times of high performance slump retention type polycarboxylate superplasticizer(release early, release mid and later released type) were prepared. GPC analysis was carried out on three kinds of high performance slump retention type polycarboxylate superplasticizer by gel chromatography. Its release rules and adaptability to different characteristics of the cement were studied and applied in concrete engineering practice to verify the correctness of the design method.

王倩,王立彬,任建波,等.不同释放时间保坍型聚羧酸高性能减水剂研究[J].混凝土与水泥制品,2020(11):20-25. WANG Q,WANG L B,REN J B,et al.Study on High Performance Slump Retention Type Polycarboxylate Superplasticizer with Different Release Time[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(11):20-25.

珊瑚混凝土碳化深度影响因素及其预测模型研究

陈爽1，元艳妃2，易金1,2

2020年第11期

摘要

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摘要：通过快速碳化试验研究了水灰比、水泥用量、粉煤灰掺量、碳化龄期四个因素对珊瑚混凝土碳化深度的影响，试验龄期分别为3 d、7 d、14 d、28 d。结果表明：珊瑚混凝土的碳化深度与水灰比、粉煤灰掺量呈正比，与水泥用量呈反比；碳化深度均随碳化龄期增长而增大。基于MATLAB中双隐含层BP神经网络，建立了珊瑚混凝土碳化深度预测模型，编写了循环训练算法程序，经过40次循环近百万次网络训练筛选出了双隐含层最佳神经元节点数，分别为11、5，最小均方根误差为0.67。经验证，该预测模型预测平均误差为5.57%，预测精度良好。 Abstract: The effects of water-cement ratio, cement amount, fly ash content, and carbonization age on the coral concrete by using fast carbonation experiment were studied. The experimental ages were 3 d, 7 d, 14 d and 28 d, respectively. The results show that the carbonation depths of coral concrete are positive correlation with water-cement ratio, fly ash content and carbonation age, while negative correlation with the cement content. The carbonation depth increases with the increase of carbonization age. A forecast model of coral concrete carbonation depth was established based on double hidden layer BP neural network in MATLAB. The cyclic-training algorithm program was written, and the optimal neurons number of hidden layer was found to be 11 and 5 after 40 cycles nearly million times network training. It is verified the average prediction error of the prediction model is 5.57%, and the prediction accuracy is good.

陈爽,元艳妃,易金.珊瑚混凝土碳化深度影响因素及其预测模型研究[J].混凝土与水泥制品,2020(11):15-19. CHEN S,YUAN Y F, YI J.Study on Influencing Factors and Forecasting Model of Coral Concrete Carbonation[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(11):15-19.

装配式桥梁湿接缝混凝土变形及界面性能研究

夏强1,2,3,4,孙宇1，王冬1,2,3,4，唐修生1,2,3,4，祝烨然1,2,3,4，徐志峰1,2,3,4

2020年第11期

摘要

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摘要：探讨了膨胀剂掺量、养护条件和界面状况对湿接缝混凝土的力学强度、变形特征、界面黏结强度及黏结抗渗性能的影响。试验结果表明：限制养护条件下微膨胀混凝土力学强度较同龄期自由养护试件均有提高，外部约束有利于提高其力学强度；养护条件对湿接缝混凝土的变形性能具有显著影响，工程应用中湿接缝混凝土应进行不少于14 d的湿养护；光面、粗糙面和界面剂处理三种接缝界面状态下，粗糙面试件的黏结劈裂抗拉强度和黏结抗渗性能最高，光面试件最低。涂刷界面剂后黏结劈裂抗拉强度略高于光面试件，但是黏结抗渗性能明显优于光面试件，渗透系数比光面试件降低了73.5%。 Abstract: The effects of the dosage of expansive agent, curing condition and interface situation on the mechanical strength, deformation characteristics, interface bonding strength as well as anti-permeability of wet joint concrete were studied. The results show that mechanical strength of micro-expansive concrete under restrained curing condition is higher than that of under free curing condition at the same ages, which indicates that restraint is beneficial to improvement of mechanical strength. The curing condition has a significant influence on deformation performance of wet-joint concrete and in practise wet-joint concrete should be wet cured for at least 14 d. Among three interface situations, the specimens with rough surface have highest bonding strength and resistance to penetrability while the specimens with smooth surface are the worst. The specimens that are brushed with interfacial agent have a little higher bonding strength but significantly better resistance to penetrability than the smooth specimens with a decrease of permeability coefficient by 73.5%.

夏强,孙宇,王冬,等.装配式桥梁湿接缝混凝土变形及界面性能研究10-14. XIA Q,SUN Y,WANG D,et al.Study on Deformation and Interface Performance of Wet-joint Concrete of Prefabricated Bridge[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(11):10-14.

甲酸钙对砂浆抗氯离子侵蚀性能的影响

贲询钦，蒋林华，孟远远，靳卫准，陈磊，王飞

2020年第11期

摘要

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摘要：采用RCM法、电位滴定法研究了甲酸钙对水泥砂浆中氯离子扩散系数及氯离子含量的影响，通过测定不同浸泡龄期试件的自腐蚀电位、电化学阻抗谱研究了甲酸钙对砂浆中钢筋锈蚀的影响，采用XRD、SEM分析了甲酸钙对砂浆中水泥水化产物及微观形貌的影响。研究结果表明：甲酸钙能使水泥砂浆中的氯离子扩散系数增大，并随着水胶比增大，孔隙液中自由氯离子含量提高，总氯离子含量增大；甲酸钙使水泥砂浆浸泡NaCl溶液后的Friedel盐及Ca(OH)2含量减少，溶液pH值降低，氯离子更易到达钢筋表面，加速了水泥砂浆中钢筋的腐蚀。 Abstract: RCM method and potentiometric titration method were used to study the effect of calcium formate on chloride diffusion coefficient and chloride content in cement mortar. The effect of calcium formate on the corrosion of steel bars in mortar was studied by measuring the self-corrosion potential and electrochemical impedance spectroscopy of samples with different soaking ages. The effects of calcium formate on cement hydration products and microstructure in mortar were analyzed by XRD and SEM. The results show that calcium formate increases the diffusion coefficient of chloride ions in cement mortar. With the increase of water-binder ratio, calcium formate increases the content of total chloride ions and free chloride ions in pore solution. The content of Friedel′s salt and Ca(OH)2 decreases after the cement mortar soaked in NaCl solution, and the pH value of the solution decreases, and the chloride ions are more likely to reach the surface of the steel bar. Calcium formate accelerates the corrosion of reinforcement in cement mortar.

贲询钦,蒋林华,孟远远,等.甲酸钙对砂浆抗氯离子侵蚀性能的影响[J].混凝土与水泥制品,2020(11):6-9,14. BEN X Q,JIANG L H,MENG Y Y,et al.Effect of Calcium Formate on the Resistance to Chloride Ion Erosion of Cement Mortar[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(11):6-9,14.

3D打印混凝土工艺参数对成型精度的影响

武雷，郭潞杰，康强

2020年第11期

摘要

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摘要：为了提高3D打印混凝土构件的成型精度，结合转臂式打印设备研究了分层厚度、搭接宽度、挤出速度和进给速度四个打印工艺参数，应用控制变量法对工艺参数进行了工艺试验和理论分析，确定了工艺参数对成型精度的影响规律，并建立了数学模型来提高3D打印混凝土构件的成型精度。 Abstract: In order to improve the forming precision of the 3D printed components, combined with the jib type printed equipment, four printing process parameters of layer thickness, overlap width, extrusion speed and feed speed for the forming precision were studied. By using the control variable method, the process parameters were tested and analyzed theoretically. The influence of process parameters on the forming precision was determined, and the mathematical model was established to improve the forming precision of 3D concrete printed components.

武雷,郭潞杰,康强.3D打印混凝土工艺参数对成型精度的影响[J].混凝土与水泥制品,2020(11):1-5. WU L,GUO L J,KANG Q.The Influence of 3D Printed Concrete Process Parameters on Forming Precision[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(11):1-5.

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