混凝土研究_2021_《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

混凝土比强度的主要影响因素研究

周倩倩，谢友均，龙广成，张思思，CHAKTRIMONGKOL Pakorn

2021年第11期

摘要

引用本文

摘要：分别研究了矿物掺合料（粉煤灰、矿渣）、养护方式对普通混凝土比强度的影响；陶粒、橡胶颗粒、聚苯颗粒对轻骨料混凝土比强度的影响以及陶砂、钢纤维对(超)高强混凝土比强度的影响。结果表明：适量掺入矿渣，普通混凝土28 d的比强度提高更大；轻骨料混凝土的比强度分别随陶粒、橡胶颗粒、聚苯颗粒取代率的增加而降低，其中，陶粒对轻骨料混凝土比强度的不利影响相对较小；当掺入1.5%的钢纤维和18%的陶砂时，（超）高强混凝土的比强度提升幅度最大。 Abstract: The influence of mineral admixtures (fly ash, slag) and curing methods on the specific strength of ordinary concrete, and the influence of ceramsite, rubber particles, and polystyrene particles on the specific strength of lightweight aggregate concrete, and the influence of ceramic sand and steel fiber on the (super)high-strength concrete were studied. The results show that the proper amount of slag can improve the specific strength of ordinary concrete at 28 d age. And the specific strength of lightweight aggregate concrete decreases as the volume of aggregates replaced by ceramsite, rubber particles, and expanded polystyrene increases. The adverse effect of ceramsite on the specific strength of lightweight aggregate concrete is relatively small. When mixed with 1.5% steel fiber and 18% ceramic sand, the specific strength of (super) high-strength concrete increases the most.

周倩倩,谢友均,龙广成,等.混凝土比强度的主要影响因素研究[J].混凝土与水泥制品,2021(11):39-43. ZHOU Qian-qian, XIE You-jun, LONG Guang-cheng,et al.Research on Main Influencing Factors of Specific Strength of Lightweight High Strength Concrete[J].China Concrete and Cement Products,2021(11):39-43.

多孔结构对硫氧镁水泥吸波性能的影响

何楠1，陈乐2，周旺1，郝万军2，林曦鹏1，陈海生1,3

2021年第11期

摘要

引用本文

摘要：采用物理发泡技术制备了硫氧镁水泥复合吸波多孔材料，并对其进行了孔径特征和电磁参数测试。基于有效介质理论和传输线理论，模拟了此多孔材料对8~18 GHz频段电磁波的吸收性能。结果表明：多孔材料的孔隙率和气孔的平均孔径随设计密度的增大而减小；多孔结构可以降低材料的有效介电常数，提高阻抗匹配性能；数值模拟吸波性能曲线的变化规律与测试结果基本一致。 Abstract: A composite microwave absorbing material of porous magnesium oxysulfide cement was prepared by physical foaming technology. The pore size characteristics and electromagnetic parameters of porous materials were measured and analyzed. Based on the the effective medium theory and transmission line theory, the electromagnetic wave absorption performance of porous materials in the 8~18 GHz frequency band was simulated. The results show that with the increasing density, the porosity and the average pore size of the pores in the porous material decrease. The porous structure can reduce the effective dielectric constant of the material and improve the impedance matching performance. The curve of absorbing property of numerical simulation materials is consistent with the test results.

何楠,陈乐,周旺,等.多孔结构对硫氧镁水泥吸波性能的影响[J].混凝土与水泥制品,2021(11):34-38. HE N,CHEN L,ZHOU W,et al.The Influence of Porous Structure on the Microwave Absorbing Properties of Magnesium Oxysulfide Cement[J].China Concrete and Cement Products,2021(11):34-38.

养护温度与粉煤灰掺量对钙镁复合膨胀剂膨胀效能的影响

盛智博1，于方1，肖尹文2，杨海成1，邓春林1

2021年第11期

摘要

引用本文

摘要：开展了养护温度（20 ℃、40 ℃、60 ℃）和粉煤灰掺量（10%、20%、30%）对掺钙镁复合膨胀剂（CM）砂浆膨胀效能的影响研究，并结合微观测试手段，分析了其影响机理。结果表明：CM对温度较为敏感，养护温度越高，CM水化速率越快，膨胀量增幅越大；20~60 ℃时，粉煤灰可显著抑制CM的膨胀，且粉煤灰掺量越大，对CM的抑制作用越明显；CM中CaO组分反应速率较快，其水化产物Ca(OH)2有效促进了MgO的水化。 Abstract: The effect of curing temperature(20 ℃, 40 ℃, 60 ℃) and fly ash content(10%、20%、30%) on the expansion performance of calcium-magnesium composite expansion agent(CM) mortar was carried out. Through the use of a series of micro-testing methods, the influence mechanism was analyzed. The results show that CM is more sensitive to temperature. The higher the curing temperature, the faster the hydration rate of CM, the greater the increase in expansion. When the curing temperature is 20~60 ℃, the expansion of CM is significantly inhibited by fly ash, and the greater the amount of fly ash, the more obvious the expansion efficiency of CM is inhibited. The CaO component of CM has a faster reaction rate. The hydration product Ca(OH)2 is an alkaline environment created by MgO, which promotes the hydration of MgO.

盛智博,于方,肖尹文,等.养护温度与粉煤灰掺量对钙镁复合膨胀剂膨胀效能的影响[J].混凝土与水泥制品,2021(11):29-33. SHENG Z B,YU F,XIAO Y W,et al.Effect of Curing Temperature and Fly Ash Content on the Expansion Performance of Calcium-magnesium Composite Expansion Agent[J].China Concrete and Cement Products,2021(11):29-33.

应变率和尺寸效应对透水混凝土受压动力性能的影响

祝秀琴1，李维丽1，张丽2，赵志青3

2021年第11期

摘要

引用本文

摘要：为研究应变率和尺寸效应对透水混凝土受压动力性能的影响，设置了十种应变率和三种立方体尺寸的试件，对透水混凝土展开单轴受压力学性能试验研究。结果表明：随着应变率的增加，透水混凝土的抗压强度逐渐增大；随着立方体试件边长的增大，应变率对透水混凝土抗压强度的增加幅度逐渐减小，透水混凝土的抗压强度逐渐减小；受应变率增加的影响，尺寸效应对透水混凝土抗压强度的减小幅度逐渐增加；提出的尺寸效应律模型方程能够较好地表述不同应变率下透水混凝土抗压强度的尺寸效应；基于应变率和尺寸效应参数，还提出了透水混凝土抗压强度计算方程。 Abstract: In order to explore the influence of strain rate and size effect on the dynamic performance of pervious concrete under compression, ten different loading strain rates and three different cube sizes specimen were set up. The uniaxial compression performance tests of pervious concrete were carried out. The results show that with the increase of strain rate, the compressive strength of pervious concrete gradually increases. With the increase of cube concrete specimen side length, the increase of strain rate on the compressive strength of pervious concrete gradually decreases, and the compressive strength of pervious concrete gradually decreases. Affected by the increase of strain rate, the size effect on the reduction of the compressive strength of pervious concrete gradually increases. The proposed size effect law model equation can better express the size effect of the compressive strength of pervious concrete under different strain rates. Based on the strain rate and size effect parameters, the calculation equation of the compressive strength of pervious concrete is proposed.

祝秀琴,李维丽,张丽,等.应变率和尺寸效应对透水混凝土受压动力性能的影响[J].混凝土与水泥制品,2021(11):23-28. ZHU X Q,LI W L,ZHANG L,et al.The Influence of Strain Rate and Size Effect on the Dynamic Performance of Pervious Concrete Under Compression[J].China Concrete and Cement Products,2021(11):23-28.

3D打印混凝土性能的影响因素及研究进展

张敏霞1，范开均1，徐平1，任新锋2，丁亚红1

2021年第11期

摘要

引用本文

摘要：总结分析了水泥品种、掺合料及拌和物稠度对3D打印混凝土性能的影响。对比分析了不同水泥品种以及掺合料的3D打印混凝土性能的差异，提出了不同建造工况下水泥品种、掺合料的选择方法，综述了拌和物稠度在3D打印混凝土制备中的重要作用。此外，还提出了3D打印混凝土材料在研发中所面临的问题和挑战，并对未来3D打印混凝土的研究方向进行了展望。 Abstract: The impact of cement types, admixtures and consistency of the mixture on the properties of 3D printed concrete is summarized and analyzed. The performance differences of 3D printed concrete with different types of cement and admixtures are compared and analyzed. The selection methods of cement varieties and admixtures under different construction conditions are proposed. The important role of the consistency of the mixture in the preparation of 3D printed concrete is summarized. The problems and challenges of 3D printed concrete materials in the development are also proposed, and the future research direction of 3D printed concrete is pointed out.

张敏霞,范开均,徐平,等.3D打印混凝土性能的影响因素及研究进展[J].混凝土与水泥制品,2021(11):18-22. ZHANG M X,FAN K J,XU P,et al.Influencing Factors and Research Progress on the Properties of 3D Printed Concrete[J].China Concrete and Cement Products,2021(11):18-22.

基于湿堆积密度方法优化设计超高性能混凝土

韩建军1，席壮民1，卢鹏2，郭子龙3，尹奎4，杨龙宾5，吕亚军5

2021年第11期

摘要

引用本文

摘要：基于最大湿堆积密度理论优化设计超高性能混凝土（UHPC）。首先，设计了25组试验工况，分别计算出每组工况变量与最大湿堆积密度的关系，建立了最大湿堆积密度预测模型。然后，用石英粉部分替代水泥，研究了不同替代率对UHPC流动性、力学性能的影响。结果表明：预测模型与试验结果具有较好的吻合性；UHPC的流动度随着石英粉掺量的增加而增加，且当石英粉掺量为20%时，UHPC的抗压强度和抗折强度最大。此外，生态评价表明，使用石英粉部分替代水泥生产UHPC，可显著降低对环境的影响。 Abstract: Mix proportion of ultra-high performance concrete (UHPC) was optimal designed based on maximum wet packing density theory. Firstly, 25 groups of test conditions were designed, the relationship between each working condition variable and the maximum wet packing density was calculated, and the prediction model of the maximum wet packing density was established. Then, quartz powder was used to partially replace cement, and the effects of different substitution rates on the fluidity and mechanical properties of UHPC were studied. The results show that the prediction model is in good agreement with the experimental results. The fluidity of UHPC increases with the increase of quartz powder content. When the content of quartz powder is 20%, the compressive strength and flexural strength of UHPC are the largest. In addition, the ecological evaluation shows that using quartz powder to partially replace cement to produce UHPC can significantly reduce the impact on the environment.

韩建军,席壮民,卢鹏,等.基于湿堆积密度方法优化设计超高性能混凝土[J].混凝土与水泥制品,2021(11):12-17. HAN J J,XI Z M,LU P,et al.Optimization Design of Ultra-high Performance Concrete Based on Wet Packing Density Method[J].China Concrete and Cement Products,2021(11):12-17.

不同缝高比混凝土梁试件三点弯曲断裂声发射特性研究

王宁，石丹丹

2021年第11期

摘要

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摘要：结合声发射技术，针对四种缝高比（0.2、0.3、0.4、0.5）的混凝土梁试件开展了单调三点弯曲断裂试验，探究了混凝土梁的断裂特性和裂缝扩展机理，对比研究了不同缝高比对混凝土梁断裂力学特性的影响。试验结果表明，混凝土梁试件的峰值荷载会随着缝高比的增大而降低。随着缝高比的增大，试件裂缝张开口位移临界值增大，而失稳断裂韧度和断裂能均减小。加载过程中，声发射参数累计值均随缝高比的减小而增大，但平均值无明显变化规律。基于单位时间声发射撞击数的变化，将试件单调断裂加载过程划分为三个阶段，并给出了基于声发射信号强度分析的混凝土结构安全区域。 Abstract: The monotonic three-point bending tests were carried out for the concrete beam specimens with the different notch-to-depth ratios (0.2, 0.3, 0.4, 0.5) by combining with acoustic emission technique. The fracture characteristics and crack propagation mechanism of concrete beam specimens were explored, and the effect of notch-to-depth ratios on the fracture mechanical properties of concrete beam was investigated. The experimental results show that the increase of notch-to-depth ratio can lead to the decrease of peak load. With the increase of notch-to-depth ratio, the critical crack opening displacement of the concrete beam specimen increases, but the instability fracture toughness and fracture energy both decrease. During the loading process, the cumulative values of acoustic emission parameters increase with the decrease of the notch-to-depth ratio, but the average values have no obvious change rule. Based on the change of acoustic emission hits per unit time, the monotonic fracture loading process of concrete beam specimens can be divided into three stages. In addition, the safe area is given according to the analysis of acoustic emission signal intensity.

王宁,石丹丹.不同缝高比混凝土梁试件三点弯曲断裂声发射特性研究[J].混凝土与水泥制品,2021(11):6-11. WANG N,SHI D D.Acoustic Emission Characteristics of Three-point Bending Fracture of Concrete Beam Specimen with Different Notch-to-depth Ratio[J].China Concrete and Cement Products,2021(11):6-11.

改性硅灰、粉煤灰对超高性能混凝土（UHPC）性能的影响

王东明1，张世宇1，姚苏皖1，邹定华1,2

2021年第11期

摘要

引用本文

摘要：为降低超高性能混凝土（UHPC）黏度、提高工作性，采用辅助胶凝材料（硅灰、粉煤灰）和硅烷（γ-缩水甘油醚氧丙基三甲氧基硅烷、十二烷基三甲氧基硅烷）进行改性制备了自分散颗粒，并研究了其对UHPC工作性、抗压强度及微观结构的影响。结果表明：自分散颗粒降低了UHPC的黏度，提高了工作性；不同自分散颗粒对UHPC工作性的影响有较大差别，其中，粉煤灰和十二烷基三甲氧基硅烷制备的自分散颗粒效果最好；自分散颗粒抑制胶凝材料的早期水化，降低UHPC早期抗压强度；不同自分散颗粒对UHPC的28 d抗压强度影响也各不相同，采用粉煤灰和十二烷基三甲氧基硅烷制备的自分散颗粒提高了UHPC的28 d抗压强度，其他自分散颗粒降低了28 d抗压强度。 Abstract: In order to reduce viscosity and promote workability of fresh ultra-high performance concrete(UHPC), self-dispersing particles were prepared by using supplementary cementitious materials(fly ash and silica fume) modified by silanes( γ-glycidoxypropyltrimethoxysilan and dodecyltrimethoxysilane), and the workability, compressive strength and microstructure of UHPC were investigated. The results show that viscosity of fresh UHPC decreases, and the workability increases when self-dispersing particles are employed. The influence of different self-dispersing particles on workability is quite different. Self-dispersing particles prepared from fly ash modified by dodecyltrimethoxysilane show the highest effectiveness. Early age hydration of cementitious materials is inhibited by self-dispersing particles and compressive strength of UHPC decreases. Different self-dispersing particles have different effects on the 28 d compressive strength of UHPC. Self-dispersing particles prepared from fly ash and dodecyltrimethoxysilane increase the 28 d compressive strength of UHPC, while other self-dispersing particles reduce the 28 d compressive strength of UHPC.

王东明,张世宇,姚苏皖,等.改性硅灰、粉煤灰对超高性能混凝土（UHPC）性能的影响[J].混凝土与水泥制品,2021(11):1-5,11. WANG D M,ZHANG S Y,YAO S W,et al.Influence of Modified Silica Fume or Fly Ash on the Performance of Ultra-high Performance Concrete (UHPC)[J].China Concrete and Cement Products,2021(11):1-5,11.

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