混凝土研究_2023_《混凝土与水泥制品》杂志社

头部文案

发布时间：2020-01-06 00:00:00

全国建材科技期刊
全国中文核心期刊
中国科技论文统计源期刊
万方数据-数字化期刊群入网期刊
中国学术期刊（光盘版）全文收录期刊

华东地区优秀科技期刊
江苏省期刊方阵“双效期刊”
中国期刊网全文收录期刊
中国科技期刊数据库全文收录期刊



全部文章

混凝土研究

盾构砂对减水剂吸附行为及水泥砂浆流变性能的影响

陆加越，叶强*

2023年第11期

摘要

引用本文

摘要：依托海太过江通道工程，研究了盾构砂对减水剂吸附行为、水泥砂浆流变性能的影响。结果表明：盾构砂的掺入降低了水泥砂浆的流变性能；与轻度交联的PCE-1相比，盾构砂中粒径≤75 μm的细粉颗粒对常规型聚羧酸减水剂（PCE-0）的吸附作用更强；PCE-1具有较好的黏土耐受性和水泥分散能力，对水泥砂浆流动性的改善效果比PCE-0好；掺盾构砂砂浆体系较好地符合Herschel-Bulkley模型，在相同流动性条件下，盾构砂的掺入使减水剂需求量增加，且随着盾构砂掺量的增加，减水剂用量增大，表观黏度及残余黏度均增大，剪切增稠行为更显著。 Abstract: Based on the Haitai river crossing project， the effect of shield sand on the adsorption behavior of polycarboxylate superplasticizer and the rheological properties of cement mortar was studied. The results show that the incorporation of shield sand reduces the rheological properties of cement mortar. The microfines with particle size≤75 μm in shield sand have a stronger adsorption effect on conventional polycarboxylate superplasticizer(PCE-0) compared with lightly crosslinked PCE-1. The PCE-1 has good clay tolerance and cement dispersibility, and the effect on improving the fluidity of cement mortar is better than that of PCE-0. The shield mortar system conforms to the Herschel-Bulkley model well. Under the same fluidity conditions, shield sand increases the demand for polycarboxylate superplasticizer, and the polycarboxylate superplasticizer content increases with the increase of shield sand content, and the apparent viscosity and the residual viscosity increase, and the shear thickening behavior is more significantly.

陆加越,叶强.盾构砂对减水剂吸附行为及水泥砂浆流变性能的影响[J].混凝土与水泥制品,2023(11):1-5,10. LU J Y,YE Q.Influence of shield sand on adsorption of polycarboxylate superplasticizer and rheology of cement mortar[J].China Concrete and Cement Products,2023(11):1-5,10.

碳酸锂与硝酸钠对风电灌浆料低温早期性能的影响

蒋涛，吴国芳，夏如茜，许志杨，曹鑫铖，李酉成

2023年第11期

摘要

引用本文

摘要：研究了-5 ℃环境条件下，不同掺量的碳酸锂单掺及与硝酸钠复掺对风电灌浆料的流动度、5 h抗压强度和收缩率的影响，并采用HEA膨胀剂进行性能优化。结果表明：碳酸锂的掺入会降低灌浆料的流动度，且随着掺量的增加，流动度的降低幅度增加，硝酸钠对灌浆料流动度的影响相对较小；碳酸锂与硝酸钠复掺能显著提高灌浆料的5 h抗压强度；相较于碳酸锂单掺，碳酸锂与硝酸钠复掺显著提高了水化产物的生成速率，但早期强度发展过快会使灌浆料的收缩较大；当HEA膨胀剂掺量为0.6%~0.8%时，灌浆料具有较好的流动性、抗压强度及微膨胀特性。 Abstract: The effects of different contents of lithium carbonate and its combination with sodium nitrate on the flowability, 5 h compressive strength, and shrinkage of wind power grouting materials under -5 ℃ environmental conditions were studied, and the performance was optimized by using HEA expansion agent. The results show that the addition of lithium carbonate can reduce the flowability of the grouting material, and the decrease in flowability increases with the increase of the content, while the effect of sodium nitrate on the flowability of the grouting material is relatively small. The combination of lithium carbonate and sodium nitrate can significantly improve the 5 h compressive strength of the grouting material. Compared to the alone addition of lithium carbonate, the combination of lithium carbonate and sodium nitrate significantly increases the generation rate of hydration products, but the rapid development of early strength will cause significant shrinkage of the grouting material. When the content of HEA expansion agent is 0.6%~0.8%, the grouting material has good flowability, compressive strength, and slight expansion characteristics.

蒋涛,吴国芳,夏如茜,等.碳酸锂与硝酸钠对风电灌浆料低温早期性能的影响[J].混凝土与水泥制品,2023(11):6-10. JIANG T,WU G F,XIA R X,et al.The effect of lithium carbonate and sodium nitrate on the early performance of wind power grouting materials at low temperature[J].China Concrete and Cement Products,2023(11):6-10.

大体积混凝土早期温度应力及裂缝控制仿真模拟与试验研究

李灿1，熊俊驰1，*，梁栋2，周殷弘2，王典3，程赟4

2023年第11期

摘要

引用本文

摘要：为了研究大体积混凝土浇筑后一段时间后的温度及应力变化规律，基于某工业厂房设备基础工程配合比建立了首浇仓块的有限元仿真模型，研究了结构关键区域沿高度方向的温度及应力的时变规律，并与现场实测结果进行了对比。结果表明：各测点的温度均先迅速上升后缓慢下降，温度场分布规律为内部中心区域为高温区，随着时间的延长，高温区温度下降并逐渐下移；应力场分布规律为中心区域受压，大体积混凝土表面及下部受约束部位受拉，结构形状突变处拉应力早期发展较快；现场实测的温度变化规律与仿真模拟结果基本一致，温升相对误差在10%~20％，大体积混凝土沿高度方向越接近底部，温升相对误差越小。 Abstract: In order to study the temperature and stress changes during a period of time after pouring mass concrete, a finite element simulation model of the first poured block was established based on the mix proportion of an industrial factory equipment foundation engineering. The time-varying laws of temperature and stress along the height direction in the key areas of the structure were studied, and compared with the on-site measured results. The results show that the temperature of each measuring point rises rapidly first and then decreases slowly. The distribution law of temperature field is as follows: the temperature in the inner central area is high, and the temperature value of the high temperature area decreases and moves down gradually as time goes on. The distribution law of stress field is as follows: the central region is compressed, the surface and the lower part of the structure are strained, the tensile stress at the structural mutation develops rapidly in the early stage. The temperature variation pattern measured on site is basically consistent with the simulation results. The relative error of temperature rise is 10%~20%, and the relative error of temperature rise for mass concrete is smaller as it approaches the bottom along the height direction.

李灿,熊俊驰,梁栋,等.大体积混凝土早期温度应力及裂缝控制仿真模拟与试验研究[J].混凝土与水泥制品,2023(11):11-15,21. LI C,XIONG J C,LIANG D,et al.Simulation and experimental study on early temperature stress and temperature crack control of mass concrete[J].China Concrete and Cement Products,2023(11):11-15,21.

振动搅拌对普通混凝土和超高性能混凝土性能的影响

张颜科1，路珏1，*，杨迎1，张良奇2，冷发光3

2023年第11期

摘要

引用本文

摘要：分别设计了普通混凝土和超高性能混凝土（UHPC）的配合比，研究了振动搅拌和普通搅拌对混凝土性能的影响。结果表明：对于C30和C40普通混凝土，振动搅拌可以明显提高其工作性，而对于C50普通混凝土，振动搅拌对工作性的提高有限；振动搅拌能稳定提高普通混凝土的匀质性和抗压强度；振动搅拌能明显提高UHPC的工作性，改善纤维团聚现象，但不能保证纤维的乱向分布；振动搅拌可以提高UHPC的抗压强度，降低其抗折强度。 Abstract: The mix proportions of ordinary concrete and ultra-high performance concrete(UHPC) were designed, and the effects of vibration stirring and ordinary stirring on their performance were studied. The results show that for C30 and C40 ordinary concrete, vibration stirring can significantly improve its workability, while for C50 ordinary concrete, the improvement of workability by vibration stirring is limited. Vibration mixing can steadily improve the uniformity and compressive strength of ordinary concrete. Vibration stirring can significantly improve the workability of UHPC and improve fiber aggregation, but it cannot guarantee the disordered distribution of fibers. Vibration stirring can improve the compressive strength of UHPC and reduce its flexural strength.

张颜科,路珏,杨迎,等.振动搅拌对普通混凝土和超高性能混凝土性能的影响[J].混凝土与水泥制品,2023(11):16-21. ZHANG Y K,LU J,YANG Y,et al.Influence of vibration stirring on the performance of ordinary concrete and ultra-high performance concrete[J].China Concrete and Cement Products,2023(11):16-21.

持续高温条件下重混凝土劣化行为研究

陈森，李浩，王振，张昆桥，张文斌，罗华清，张伟

2023年第11期

摘要

引用本文

摘要：研究了温度（25~400 ℃）与高温持续时间（0.5~30 d）耦合作用下重混凝土力学性能的变化规律，并结合微观测试分析了其影响机理。结果表明：当温度不高于80 ℃时，随着温度与高温持续时间的增加，重混凝土的力学性能略有提高；当温度高于300 ℃时，重混凝土的质量损失随着温度与高温持续时间的增加呈增大趋势，力学性能显著降低，重混凝土中的结合水、AFt、C-S-H等水化产物逐渐分解，内部有害孔比例增加；基于试验结果建立的温度和高温持续时间耦合作用下重混凝土的本构模型可以预测持续高温条件下重混凝土的力学性能。 Abstract: The change rule of mechanical properties of heavy concrete under the coupling action of temperature(25~400 ℃) and high temperature duration(0.5~30 d) was studied, and its influence mechanism was analyzed based on microscopic testing. The results show that when the temperature is not higher than 80 ℃, the mechanical properties of heavy concrete slightly improve with the increase of temperature and high temperature duration. When the temperature is higher than 300 ℃, the mass loss of heavy concrete increases with the increase of temperature and high temperature duration, and the mechanical properties significant decrease. The hydration products such as bound water, AFt, C-S-H, etc. in the heavy concrete gradually decompose, and the proportion of harmful pores inside increases. Based on the experimental results, the established constitutive model of heavy concrete under the coupling effect of temperature and high temperature duration can predict the mechanical properties of heavy concrete under continuous high temperature conditions.

陈森,李浩,王振,等.持续高温条件下重混凝土劣化行为研究[J].混凝土与水泥制品,2023(11):22-25,35. CHEN S,LI H,WANG Z,et al.Study on deterioration behavior of heavy concrete under continuous high temperature conditions[J].China Concrete and Cement Products,2023(11):22-25,35.

桥梁用机制砂混凝土的性能研究

张平，马旭东*，代浩哲，毛飞凯，冯太平

2023年第11期

摘要

引用本文

摘要：通过调整胶凝材料组分和总量、机制砂石粉含量等，研究了桥梁用机制砂混凝土的工作性、力学性能、耐久性能。结果表明：当m粉煤灰∶m矿粉为7∶4、胶凝材料总量为400 kg/m3、石粉含量为8%时，所制备的桥梁用机制砂混凝土的初始坍落度和扩展度可达250 mm和630 mm，且经时损失较小，可实现自密实浇筑，60 d抗压强度为70 MPa，28 d碳化深度仅为5.8 mm，56 d电通量为582 C，综合性能良好。 Abstract: The influence of cementitious material composition, total amount of cementitious material and stone powder content of manufactured sand on the workability, mechanical properties and durability of manufactured sand concrete for bridge was studied. The results show that when mfly ash∶mmineral powder is 7∶4, the total amount of cementitious material is 400 kg/m3, and the content of stone powder is 8%, the initial slump and expansion of the prepared manufactured sand concrete for bridge can reach 250 mm and 630 mm, and the loss is small over time, which can realize the self compacting pouring, the 60 d compressive strength is 70 MPa, and the 28 d carbonation depth is only 5.8 mm, the 56 d electric flux is 582 C. The comprehensive performance of manufactured sand concrete for bridge is good.

张平,马旭东,代浩哲,等.桥梁用机制砂混凝土的性能研究[J].混凝土与水泥制品,2023(11):26-29. ZHANG P,MA X D,DAI H Z,et al.Study on the performance of manufactured sand concrete for bridge[J].China Concrete and Cement Products,2023(11):26-29.

重晶石混凝土压电声场探伤仿真模拟与试验研究

邓伟1，刘卫东1，*，钟志民2，王东辉2，李锴2

2023年第11期

摘要

引用本文

摘要：基于COMSOL平台对重晶石混凝土的缺陷检测进行了仿真模拟及试验验证。结果表明：在多物理场耦合作用下，若边界条件与缺陷设定合理、模型建立准确，可以得到压电声场在各种介质中的传播路径与声场分布；通过压电探头接收的电信号与超声波位移场结合可以判断超声波的传播路径，从而对缺陷进行定位和定量计算缺陷半径；模拟缺陷半径接近实测与设计缺陷半径。 Abstract: Based on COMSOL platform, the defect detection of baryte concrete was simulated. The results show that the propagation path and sound field distribution of piezoelectric sound field in various media can be obtained even under the coupling of multiphysics simulation, as long as the boundary and defect are set reasonably and the model is established accurately. By combining the electrical signal received by the piezoelectric probe with the ultrasonic displacement field, the propagation path of the ultrasonic wave can be determined, thereby locating and quantitatively calculating the defect radius. The simulated defect radius is close to the measured and designed defect radius.

邓伟,刘卫东,钟志民,等.重晶石混凝土压电声场探伤仿真模拟与试验研究[J].混凝土与水泥制品,2023(11):30-35. DENG W,LIU W D,ZHONG Z M,et al.Simulation and experimental study in piezoelectric sound field flaw detection of barite concrete[J].China Concrete and Cement Products,2023(11):30-35.

总访问量 468,401 网站统计

官方微信公众号关闭

关于我们 | 联系我们 | 订购杂志 | 回到顶部

苏ICP备10086386号

网站建设：中企动力苏州