混凝土研究_2024_《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

碳酸盐环境下隧道衬砌混凝土的腐蚀研究及防治措施

刘汉宏1，傅鹤林2，任世玉2，樊永强3

2024年第7期

摘要

引用本文

摘要：依托醴娄高速周家冲隧道工程，研究了强腐蚀地下水环境中HCO3-和游离CO2对混凝土的腐蚀影响，分析了腐蚀机理，制备了抗碳酸盐和碳酸性腐蚀的C40隧道衬砌混凝土，并通过正交试验方法确定了该混凝土的最佳配合比。此外，还提出了隧道衬砌混凝土防腐措施。结果表明：混凝土的最佳配合比为m水泥∶m细骨料∶m粗骨料∶m水∶m矿粉∶m硅灰∶m硅藻土∶m■∶m减水剂=1∶1.83∶2.43∶0.35∶0.10∶0.062∶0.021∶0.016∶0.012；加强混凝土拌合、运输、泵送、浇筑、养护等施工质量控制，加强防排水措施，均可提高隧道衬砌混凝土的抗碳酸盐和碳酸腐蚀性能。 Abstract: Based on the Zhoujiachong tunnel project of Lilou expressway, the corrosion effect of HCO3- and free CO2 on concrete in highly corrosive groundwater environment were studied. The corrosion mechanism was analyzed, and C40 tunnel lining concrete with resistance to carbonate and carbonation corrosion was prepared. The optimal mix proportion of concrete was determined through orthogonal experimental method. In addition, anti-corrosion measures for tunnel lining concrete were proposed. The results show that the optimal mix proportion of concrete is mcement∶mfine aggregate∶mcoarse aggregate∶mwater∶mmineral powder∶msilica fume∶mdiatomaceous earth∶m■∶mwater reducing agent=1∶1.83∶2.43∶0.35∶0.10∶0.063∶0.021∶0.016∶0.012. Strengthening construction quality control such as concrete mixing, transportation, pumping, pouring, and curing, as well as strengthening waterproof and drainage measures, can improve the carbonate and carbonate corrosion resistance of tunnel lining concrete.

刘汉宏,傅鹤林,任世玉,等.碳酸盐环境下隧道衬砌混凝土的腐蚀研究及防治措施[J].混凝土与水泥制品,2024(6):1-6. LIU H H,FU H L,REN S Y,et al.Corrosion study and prevention measures of tunnel lining concrete in carbonate environment[J].China Concrete and Cement Products,2024(6):1-6.

基于机器学习的UHPC抗压强度预测及配合比优化

康志坚，李火星

2024年第7期

摘要

引用本文

摘要：结合试验设计、机器学习及紧密堆积模型提出了一种超高性能混凝土（UHPC）抗压强度预测和配合比优化方法，并对比了预测结果与实测结果。此外，还将支持向量回归-粒子群优化算法（SVR-PSO）模型与其他常见抗压强度预测模型进行了对比，并基于SVR-PSO模型设计开发了图形用户界面预测软件。结果表明：SVR-PSO模型在稳定性和预测精度方面具有明显优势，抗压强度预测值和实测值误差在5%以内；采用所提出的UHPC配合比设计方法，可基于原材料数据快速生成满足抗压强度要求的UHPC配合比。 Abstract: A method for predicting the compressive strength and optimizing the mix proportion of ultra-high performance concrete (UHPC) was proposed by combining experimental design, machine learning technology, and compact packing model, and the predicted results were compared with the measured results. In addition, the support vector regression-particle swarm optimization algorithm(SVR-PSO) model was compared with other common compressive strength prediction models, and a graphical user interface prediction software was designed and developed based on the SVR-PSO model. The results show that the SVR-PSO model has significant advantages in stability and prediction accuracy, with an error of less than 5% between the predicted and measured compressive strength values. The proposed UHPC mix proportion design method can quickly generate UHPC mix proportions that meet the compressive strength requirements based on raw material datas.

康志坚,李火星.基于机器学习的UHPC抗压强度预测及配合比优化[J].混凝土与水泥制品,2024(7):7-13. KANG Z J,LI H X.Prediction of compressive strength and optimization of mix proportion based on machine learning UHPC[J].China Concrete and Cement Products,2024(7):7-13.

打印路径对3D打印混凝土构件力学性能的影响

张学辉，郑书玉，陈雄姿，安军海，赵双双

2024年第7期

摘要

引用本文

摘要：在3D打印混凝土配合比研究基础上，对打印路径进行了优化设计。采用三种路径打印成型构件，评估了打印路径对3D打印混凝土构件力学性能的影响，并分析了打印构件的力学各向异性，提出了力学各向异性系数，确定了最佳受力方向。此外，通过SEM分析了打印构件的层间界面对力学性能的影响。结果表明：3D打印混凝土构件在Z方向受力最大，打印路径优化后，可有效改善层间薄弱面；打印构件在层间界面处的水化产物未能充分填充，存在空隙、气泡、裂缝等缺陷，使打印构件的力学性能降低。 Abstract: Based on the study of mix proportion of 3D printing concrete, the printing path was optimized, three paths were used to print forming components, and the effect of printing path on the mechanical properties of 3D printing concrete components was evaluated. The mechanical anisotropy of printing components was analyzed, and the mechanical anisotropy coefficient was put forward, so as to determine the best stress direction. The influence of the interlayer interface of the printing component on the mechanical properties was analyzed by SEM. The results indicate that the stress of the 3D printing concrete component is the greatest in the Z direction, and the weak surface of the interlayer can be effectively improved after the printing path is optimized. The hydration products are not fully filled at the interlayer interface, and there are some defects such as voids, bubbles and cracks, which reduces the mechanical properties of the printing components.

张学辉,郑书玉,陈雄姿,等.打印路径对3D打印混凝土构件力学性能的影响[J].混凝土与水泥制品,2024(7):14-19,28. ZHANG X H,ZHENG S Y,CHEN X Z,et al.Effect of printing path on mechanical properties of 3D printing concrete components[J].China Concrete and Cement Products,2024(7):14-19,28.

冻融循环下水工混凝土的相对动弹性模量和质量变化规律研究

张亚涛1，刘长顺2，刘磊1，秦岭2

2024年第7期

摘要

引用本文

摘要：为了研究冻融循环条件下水工混凝土相对动弹性模量和质量的变化规律，基于混凝土冻融破坏机理和现实情况分析，通过预制混凝土护坡砌块和不同配合比水工混凝土试件的快速冻融试验，分析了质量损失率、相对动弹性模量和冻融循环次数的关系。结果表明：冻融试件质量损失率转为正值时为相对动弹性模量快速降低之时，此时混凝土的含水率为快速破坏含水率；冻融过程中，试件质量前期增加，后期减少，但相对动弹性模量一直降低；可以通过快速修补、防渗处理等方式延缓水工混凝土达到快速破坏含水率，实现提高抗冻性能的目的。 Abstract: In order to study the changes in the relative dynamic elastic modulus and mass of hydraulic concrete under freeze-thaw cycle conditions, based on the analysis of concrete freeze-thaw failure mechanism and actual situation, the relationship between mass loss rate, relative dynamic elastic modulus, and freeze-thaw cycle number was analyzed through rapid freeze-thaw tests of prefabricated concrete slope protection blocks and hydraulic concrete specimens with different mix proportions. The results show that when the mass loss rate of freeze-thaw specimens turns to a positive value, it is when the relative dynamic elastic modulus rapidly decreases, and at this time, the moisture content of concrete is the rapid failure moisture content. During the freeze-thaw process, the mass of the specimen increases in the early stage and decreases in the later stage, but the relative dynamic elastic modulus keeps decreasing. Rapid repair and anti-seepage treatment can be used to delay the rapid damage of water content in hydraulic concrete, achieving the goal of improving frost resistance.

张亚涛,刘长顺,刘磊,等.冻融循环下水工混凝土的相对动弹性模量和质量变化规律研究[J].混凝土与水泥制品,2024(7):20-24. ZHANG Y T,LIU C S,LIU l,et al.Research on the relative dynamic elastic modulus and mass variation of hydraulic concrete under freeze-thaw cycle[J].China Concrete and Cement Products,2024(7):20-24.

新型复合降黏剂在C60主塔混凝土中的应用研究

李信1，陈露一1，龙勇2，黄有强1，盖柯瑜2

2024年第7期

摘要

引用本文

摘要：针对C60主塔混凝土黏度大、易开裂等问题，通过在C60主塔混凝土中掺入新型复合降黏剂，研究了新型复合降黏剂掺量（0、10%、15%、20%）对混凝土性能的影响，并分析了其作用机理。结果表明：新型复合降黏剂可降低混凝土的黏度，使其具有更好的流动性、匀质性，易于泵送，且掺量越高效果越显著；新型复合降黏剂对混凝土7 d抗压强度有一定影响，但对28 d抗压强度无不利影响；新型复合降黏剂可延缓混凝土的水化进程，且掺量增加，延迟效果也逐渐增加，混凝土绝热温升逐渐降低；新型复合降黏剂的掺入可降低混凝土的干燥收缩，且掺量越高，效果越明显。 Abstract: Aiming at the problems such as high viscosity and easy cracking of C60 main tower concrete, the effect of the dosage of compound viscosity reducer(0、10%、15%、20%) on the performance of concrete was studied by adding a new compound viscosity reducer to the C60 main tower concrete, and its mechanism of action was analyzed. The results show that the new compound viscosity reducer can reduce the viscosity of concrete, making it have better fluidity and uniformity, easy pumping, and the higher the dosage, the more significant the effect. The new compound viscosity reducer has a certain impact on the compressive strength of concrete at 7 d, but has no adverse effect on the compressive strength at 28 d. The new compound viscosity reducer can delay the hydration process of concrete, and the delay effect gradually increases with the increase of dosage, and the adiabatic temperature rise of concrete gradually decreases. The addition of the new compound viscosity reducer can reduce the drying shrinkage of concrete, and the higher the dosage, the more obvious the effect.

李信,陈露一,龙勇,等.新型复合降黏剂在C60主塔混凝土中的应用研究[J].混凝土与水泥制品,2024(7):25-28. LI X,CHEN L Y, LONG Y,et al.Study on the application of a new compound viscosity reducer in C60 main tower concrete[J].China Concrete and Cement Products,2024(7):25-28.

膨胀剂掺量对机制砂UHPC工作性和自收缩性能的影响

任蒙恩1，宁利恒1，康海1，何晓丹1，元成方2，*

2024年第7期

摘要

引用本文

摘要：针对不同膨胀剂掺量下机制砂超高性能混凝土（UHPC）的工作性及自收缩性能进行了试验研究。结果表明：随着膨胀剂掺量的增加，机制砂UHPC的流动性和凝结时间均呈先增后减的趋势，当膨胀剂掺量为10%时，二者皆达到峰值，扩展度为445 mm，初凝时间和终凝时间分别为44.4 h和50.2 h；机制砂UHPC的早期自收缩随着膨胀剂掺量的增加整体呈先减少后增加的趋势，当膨胀剂掺量为10%时，能够起到较好的收缩补偿作用。 Abstract: The workability and self-shrinkage performance of ultra-high performance concrete(UHPC) with manufacture sand under different expansion agent contents were investigated. The results show that with the increase of the content of expansion agents, the flowability and setting time of UHPC with manufacture sand show a trend of first increasing and then decreasing. When the content of expansion agent is 10%, the flowability and setting time can both reach their peak, with the expansion degree of 445 mm, the initial setting time of 44.4 h, and the final setting time of 50.2 h respectively. The early self-shrinkage of UHPC with manufacture sand shows an overall trend of first decreasing and then increasing with the increase of expansion agent content, and when the expansion agent content is 10%, it can achieve a better shrinkage compensation effect.

任蒙恩,宁利恒,康海,等.膨胀剂掺量对机制砂UHPC工作性和自收缩性能的影响[J].混凝土与水泥制品,2024(7):29-32,37. REN Meng’en, NING Liheng, KANG Hai,et al.Effect of expansion agent content on the workability and self-shrinkage performance of UHPC with manufacture sand[J].China Concrete and Cement Products,2024(7):29-32,37.

气泡结构对新拌混凝土工作性的影响研究

姚进强，樊航*，楼栗诚

2024年第7期

摘要

引用本文

摘要：采用新拌混凝土气泡结构分析仪测定了新拌混凝土的气泡结构参数，通过灰色关联分析方法研究了气泡结构参数对新拌混凝土工作性的影响，并分析了其作用机理。结果表明：不同直径范围的气泡对新拌混凝土坍落度的影响程度不同；当含气量相近时，小直径范围内气泡含量越多，新拌混凝土中气泡的平均直径和间距系数越小，可显著提高新拌混凝土的工作性。 Abstract: The bubble structure parameters of fresh concrete were measured by using the fresh concrete bubble structure analyzer, and the influence of the bubble structure parameters of fresh concrete on its workability was studied by using the grey correlation analysis method, and its mechanism of action was analyzed. The results indicate that bubbles with different diameter ranges have varying degrees of promotion on the slump of fresh concrete. When the air content is similar, the more bubbles in the small diameter range, the smaller the average diameter and spacing coefficient of the overall bubbles in the fresh concrete, which can significantly improve the workability of fresh concrete.

姚进强,樊航,楼栗诚.气泡结构对新拌混凝土工作性的影响研究[J].混凝土与水泥制品,2024(7):33-37. YAO J Q,FAN H,LOU L C.Study on the influence of bubble structure on the workability of fresh concrete[J].China Concrete and Cement Products,2024(7):33-37.

养护条件对混凝土力学性能及抗硫酸盐侵蚀性能的影响

曹建青，张萌，赵丽娜，范文晓，令芳

2024年第7期

摘要

引用本文

摘要：针对新疆盐渍环境及高温干旱气候条件下混凝土普遍存在的硫酸盐侵蚀问题，研究了不同养护条件[标准养护、自然条件下内养护、（40±2）℃恒温内养护]对混凝土力学及抗硫酸盐侵蚀性能的影响，进行了混凝土的抗压强度、干湿循环硫酸盐侵蚀试验，计算了质量损失率及耐蚀系数。结果表明：SAP内养护可以在一定程度上改善混凝土的抗压强度，且可以延缓干湿循环硫酸盐侵蚀对混凝土的腐蚀破坏；混凝土的耐蚀系数与质量损失率之间有显著的负相关性，随着耐蚀系数的降低，混凝土的质量损失率增加。 Abstract: In response to the common sulfate corrosion problem in concrete under saline environment and high-temperature and arid climate conditions in Xinjiang, the effects of different curing conditions[standard curing, internal curing under natural conditions, and constant temperature internal curing at (40±2)℃] on the mechanical and sulfate corrosion resistance performance of concrete were studied. The compressive strength and dry-wet cycle sulfate corrosion test of concrete were carried out, and the mass loss rate and corrosion resistance coefficient were calculated. The results show that SAP internal curing can improve the compressive strength of concrete to a certain extent, and can delay the corrosion damage of concrete caused by dry-wet cycle sulfate corrosion. There is a significant negative correlation between the corrosion resistance coefficient and the mass loss rate of concrete. As the corrosion resistance coefficient decreases, the mass loss rate of concrete increases.

曹建青,张萌,赵丽娜,等.养护条件对混凝土力学性能及抗硫酸盐侵蚀性能的影响[J].混凝土与水泥制品,2024(7):38-41. CAO J Q,ZHANG M,ZHAO L N,et al.Effect of curing conditions on the mechanics and sulfate resistance of concrete[J].China Concrete and Cement Products,2024(7):38-41.

透水混凝土力学性能影响因素的研究进展与分析

范向前1，2，韩浩田1，3，陆俊1，2

2024年第7期

摘要

引用本文

摘要：为保证工程建设的安全性和有效性，充分了解不同因素对透水混凝土力学性能的影响机理，总结了近年来国内外关于水灰比、砂率、掺合料种类及掺量、骨料粒径等因素对透水混凝土力学性能影响的研究成果，分析了现有研究中存在的不足和尚未解决的问题，并基于透水混凝土细观损伤机理和力学行为，指出了未来进一步研究方向。 Abstract: In order to ensure the safety and effectiveness of pervious concrete project, and fully understand the influence mechanism of different factors on the mechanical properties of pervious concrete, the domestic and foreign research results on the influence of water-cement ratio, sand rate, admixture type and content, aggregate particle size on the mechanical properties of pervious concrete in recent years were summarized, the shortcomings and unsolved problems in the existing research were analyzed, and the development trend of future research work from the aspects of microscopic damage mechanism and mechanical behavior of pervious concrete were pointed out.

范向前,韩浩田,陆俊.透水混凝土力学性能影响因素的研究进展与分析[J].混凝土与水泥制品,2024(7):42-47,59. FAN X Q,HAN H T,LU J.Research progress and analysis of the effect factors onmechanical properties of pervious concrete[J].China Concrete and Cement Products,2024(7):42-47,59.

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