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

超高性能混凝土设计理论与磷石膏高质利用研究进展

冯元1，2，吴赤球3，吕伟3，刘康宁1，2，尹天一1，2，刘雪1，4，付诗媛1，2，余睿1，*

2024年第1期

摘要

引用本文

摘要：从干堆积、湿堆积、化学堆积、复杂原料的等效堆积等方面综述了超高性能混凝土（UHPC）配合比设计理论从MAA模型发展至全尺度物理和化学协同堆积模型的过程，阐述了人工智能技术在提升理论设计精度中的重要应用，以及借助UHPC设计理论实现固废高质化利用和混凝土高性能协同提升的可行性，可为UHPC原材料的优化设计提供参考。 Abstract: A comprehensive overview of the development of the mix design theory of ultra-high performance concrete (UHPC) from the MAA model to full-scale physical and chemical synergistic stacking models, including aspects such as dry stacking, wet stacking, chemical stacking, and equivalent stacking of complex materials are provided. It also elucidates the significant application of artificial intelligence technology in improving theoretical design accuracy and the feasibility of achieving high-quality utilization of solid waste and synergistic enhancement of concrete performance through UHPC design theory. It can serve as a reference for the optimization design of UHPC raw materials.

冯元,吴赤球,吕伟,等.超高性能混凝土设计理论与磷石膏高质利用研究进展[J].混凝土与水泥制品,2024(1):1-8. FENG Y,WU C Q,LYU W,et al.Research progress on design theory of ultra-high performance concrete and high-quality utilization of phosphogypsum[J].China Concrete and Cement Products,2024(1):1-8.

石粉对轨道交通工程用机制砂混凝土性能的影响研究

申晓明1，许志杨2，刘继红3，史星祥2，*，邹益民4，张立力2，夏如茜2，田寅2，闻遨伟5

2024年第1期

摘要

引用本文

摘要：研究了石粉含量对轨道工程用C20、C35、C50机制砂混凝土性能的影响及石粉含量的合理范围。结果表明：对于工作性和抗压强度，机制砂混凝土的强度等级越高，石粉的最佳含量越小，C20机制砂混凝土的石粉含量宜为10%~20%，C35宜为5%~10%，C50宜为5%以内；对于早期抗裂性能，C35机制砂混凝土的石粉含量宜控制在3%~7%，C50宜控制在5%以内；对于抗氯离子渗透性能，C35机制砂混凝土的石粉含量宜控制在5%~15%，C50机制砂混凝土的性能受石粉含量的影响较小；对于抗冻性能，当石粉含量在5%以内时，C35机制砂混凝土的抗冻性能变化不明显，超过5%后，抗冻性能下降，石粉含量对C50机制砂混凝土抗冻性能的影响不明显。 Abstract: The effect of stone powder content on the performance of C20, C35 and C50 manufactured sand concrete for rail transit engineering was studied, and the reasonable range of stone powder content was determined. The results show that for workability and compressive strength, the higher the strength grade of manufactured sand concrete, the smaller the optimal content of stone powder. The stone powder content of C20, C35 and C50 manufactured sand concrete should be 10%~20%, 5%~10%, and within 5%, respectively. For early crack resistance, the stone powder content of C35 manufactured sand concrete should be 3%~7%, and C50 should be controlled within 5%. For the resistance to chloride ion penetration, the stone powder content of C35 manufactured sand concrete should be controlled within 5%~15%, and the performance of C50 manufactured sand concrete is less affected by the content of stone powder. For frost resistance, when the stone powder content is within 5%, the frost resistance of C35 manufactured sand concrete does not change significantly. After exceeding 5%, the frost resistance decreases, and the effect of stone powder content on the frost resistance of C50 manufactured sand concrete is not significant.

申晓明,许志杨,刘继红,等.石粉对轨道交通工程用机制砂混凝土性能的影响研究[J].混凝土与水泥制品,2024(1):9-13. SHEN Xiaoming, XU Zhiyang, LIU Jihong,et al.Study on the influence of stone powder on the performance of manufactured sand concrete used in rail transit engineering[J].China Concrete and Cement Products,2024(1):9-13.

新型稳定剂对水泥基胶凝材料流变性能的影响

郑忠良1，朱高鹏1，么贵生1，陈克斌1，曹明莉2，*

2024年第1期

摘要

引用本文

摘要：为解决减水剂与增稠剂之间的相容性问题，研发了一种含有增稠组分的新型稳定剂，研究了其对水泥基材料的流变性能、流动性、力学性能的影响，并分析了微观结构。结果表明：新型稳定剂与减水剂具有较好的相容性，相比于单掺减水剂的拌和物，复掺新型稳定剂的拌和物屈服应力和塑性黏度降低，扩展度和力学性能增加，拌和物未出现泌水，具有较好的均质性和稳定性，且微观结构相对致密。 Abstract: To solve the compatibility issue between water reducing agents and thickeners, a new type of stabilizer with thickening components was developed. The effects of this stabilizer on the rheological, flowability, and mechanical properties of cement-based materials were studied, and the microstructure was analyzed. The results show that the new stabilizer has good compatibility with the water reducing agent. Compared to the mixture with single addition of water reducing agent, the mixture with a combination of the new stabilizer reduces the yield stress and plastic viscosity, increases the expansion and mechanical properties, and does not show bleeding. The mixture has good homogeneity and stability, and the microstructure is relatively dense.

郑忠良,朱高鹏,么贵生,等.新型稳定剂对水泥基胶凝材料流变性能的影响[J].混凝土与水泥制品,2024(1):14-18,23. ZHENG Z L,ZHU G P,YAO G S,et al.Effects of new stabilizers on the rheological properties of cementitious materials[J].China Concrete and Cement Products,2024(1):14-18,23.

硫铝酸盐水泥混凝土高温劣化规律及机理研究

段登辉1，陈嘉健1，*，郑孙博1，覃潇1，黄文琪1，汪文学2

2024年第1期

摘要

引用本文

摘要：为了探究高温下硫铝酸盐水泥混凝土的劣化规律及机理，研究了高温对不同水灰比、不同龄期的硫铝酸盐水泥混凝土抗压强度、剩余质量比率、试件爆裂率、红外温升、超声波脉冲速度的影响。结果表明：400 ℃及以上时，试件表面产生明显的裂缝，并发生爆裂现象，温度越高，爆裂率越高；试件的抗压强度和质量均随着温度的升高而降低，水灰比越低，龄期越长，抗压强度损失越大，但质量损失越小；试件的超声波脉冲速度、红外升温速率和抗压强度的线性回归结果较好。 Abstract: In order to study the deterioration law and mechanism of sulphoaluminate cement concrete under high temperature, the effects of high temperature on the compressive strength, residual mass ratio, specimen burst rate, infrared temperature rise, ultrasonic pulse speed of sulfoaluminate cement concrete with different water cement ratios and different ages were studied. The results show that when the temperature is 400 ℃ or above, obvious cracks appear on the surface of the specimens and burst occurs, and the higher the temperature, the higher the burst rate. The compressive strength and mass of the specimens decrease with the increase of temperature. The lower the water cement ratio and the longer the age, the greater the loss of compressive strength, but the smaller the loss of mass. The linear regression results of the ultrasonic pulse velocity, infrared heating rate, and compressive strength of the specimen are good.

段登辉,陈嘉健,郑孙博,硫铝酸盐水泥混凝土高温劣化规律及机理研究[J].混凝土与水泥制品,2024(1):19-23. DUAN D H,CHEN J J,ZHENG S B,et al.Study on the deterioration law and the mechanism of sulphoaluminate cement concrete after high temperature[J].China Concrete and Cement Products,2024(1):19-23.

纳米SiO2增强高强套筒灌浆料及高温后性能试验研究

逄鲁峰1，庞伟琪2，*，郎慧东3，张硕4

2024年第1期

摘要

引用本文

摘要：研究了常温下不同纳米SiO2（NS）掺量（0、0.4%、0.8%、1.2%、1.6%、2.0%）对高强套筒灌浆料流动度和强度的影响，以及不同高温温度（150、200、250 ℃）下NS掺量对高强套筒灌浆料质量损失和强度的影响，并进行了微观机理分析。结果表明：常温下，NS的掺入降低了灌浆料的流动度，灌浆料的强度随NS掺量的增加先增大后降低；高温后，灌浆料的质量损失率随温度的升高逐渐增大，抗折强度逐渐降低，抗压强度先增大后降低；NS的掺入能够降低灌浆料的质量损失率和抗折强度损失率，提高抗压强度，且随着NS掺量的增加，质量损失率和抗折强度损失率先降低后增大；NS能够改善灌浆料的内部孔结构；随着温度的升高，灌浆料的内部结构先密实后疏松。 Abstract: The effects of different nano-SiO2 (NS) contents (0, 0.4%, 0.8%, 1.2%, 1.6%, 2.0%) on the fluidity and strength of high strength sleeve grouting material at room temperature, and the effects of NS content on the mass loss and strength of high strength sleeve grouting material at different high temperatures(150, 200, 250 ℃) were studied, and the microscopic mechanism was analyzed. The results show that at room temperature, the addition of NS reduces the fluidity of grouting material, and the strength of grouting material first increases and then decreases with the increase of NS content. After high temperature, the mass loss rate of grouting material increases gradually with the increase of temperature, the flexural strength decreases gradually, and the compressive strength increases first and then decreases. The addition of NS can reduce the mass loss rate and the flexural strength loss rate of grouting material, and improve the compressive strength, and with the increase of NS content, the mass loss rate and flexural strength loss rate first decrease and then increase. NS can improve the internal pore structure of grouting material. With the increase of temperature, the internal structure of grouting material is first dense and then loose.

逄鲁峰，庞伟琪，郎慧东,纳米SiO2增强高强套筒灌浆料及高温后性能试验研究[J].混凝土与水泥制品,2024(1):24-29. PANG L F,PANG W Q,LANG H D,et al.Experimental study of nano-SiO2 reinforced high strength sleeve grouting material and post-high temperature performance[J].China Concrete and Cement Products,2024(1):24-29.

浆膜层和水膜层厚度对新拌混凝土流动性的影响

陶俊，罗小东，黄小川，肖世玉

2024年第1期

摘要

引用本文

摘要：通过改变石粉含量、砂率以及砂级配得到不同浆膜层厚度（PFT）和水膜层厚度（WFT）的混凝土拌合物，通过混凝土扩展度以及T500试验，研究了PFT与WFT对新拌混凝土流动性的影响。结果表明：当WFT＞1.40 μm时，混凝土的扩展度及T500随PFT同步变化；当WFT＜1.40 μm时，混凝土的扩展度及T500随WFT同步变化；当PFT与WFT同时增加时，混凝土的扩展度增加，T500降低；当PFT与WFT同时降低时，PFT与WFT的降幅不同，混凝土的扩展度及T500变化也有所差异。 Abstract: By changing the content of stone powder, sand ratio, and sand grading, concrete mixtures with different slurry film thickness(PFT) and water film thickness(WFT) were obtained. The influence of PFT and WFT on the flowability of fresh concrete was studied through concrete expansion and T500 tests. The results indicate that when WFT＞1.40 μm, the expansion and T500 of concrete change synchronously with PFT. When WFT＜1.40 μm, the expansion and T500 of concrete change synchronously with the change of WFT. When PFT and WFT increase simultaneously, the expansion of concrete increases and T500 decreases. When both PFT and WFT decrease simultaneously, the reduction amplitude of PFT and WFT is different, and the expansion and T500 changes of concrete are also different.

陶俊,罗小东,黄小川,等.浆膜层和水膜层厚度对新拌混凝土流动性的影响[J].混凝土与水泥制品,2024(1):30-34. TAO J,LUO X D,HUANG X C,et al.Influence of slurry film thickness and water film thickness on flowability of fresh concrete[J].China Concrete and Cement Products,2024(1):30-34.

低压养护下低热水泥混凝土的性能研究

王宁1，2，3，阳黎2，3，夏艳晴1，2，3，李军1，卢忠远1，*，许毅刚2，3，钟文2，3，种娜2，3

2024年第1期

摘要

引用本文

摘要：研究了不同养护（低压养护、标准养护）条件下掺不同品种水泥（普通硅酸盐水泥OPC、低热水泥LHPC）混凝土的性能，分析了LHPC混凝土的孔结构对其性能的影响。结果表明：相同养护条件下，LHPC混凝土的后期抗压强度高于OPC混凝土；低压养护条件下，LHPC的放热量远低于OPC，LHPC可以持续进行水化，对低压环境的适应性更好，LHPC混凝土的孔结构更加致密，LHPC混凝土的耐久性能更好；混凝土的耐久性能与孔结构呈线性关系，且耐久性能随着孔结构的劣化而降低。 Abstract: The properties of different kinds of cement (ordinary Portland cement OPC, low heat Portland cement LHPC) concrete under different curing conditions(low pressure curing, standard curing) were studied, and the effect of pore structure on the properties of LHPC concrete was analyzed. The results show that under the same curing conditions, the later compressive strength of LHPC concrete is higher than that of OPC concrete. Under low pressure curing condition, the heat release of LHPC is much lower than that of OPC. LHPC can continue to hydrate and has better adaptability to low pressure environments. The pore structure of LHPC concrete is denser, and the durability of LHPC concrete is better. The durability of concrete exhibits a linear relationship with the pore structure, and the durability decreases with the deterioration of the pore structure.

王宁,阳黎,夏艳晴,等.低压养护下低热水泥混凝土的性能研究[J].混凝土与水泥制品,2024(1):35-39. WANG Ning, YANG Li, XIA Yanqing,et al.Study on the performance of low heat Portland cement concrete under low pressure curing condition[J].China Concrete and Cement Products,2024(1):35-39.

多因素对透水混凝土配合比及性能的影响研究

纪连杰1，袁文华1，2，*，孟龙1，张祥驰1，方敏1

2024年第1期

摘要

引用本文

摘要：基于正交试验法，研究了骨料粒径、水胶比、目标孔隙率、粉煤灰掺量、硅灰掺量对透水混凝土抗压强度、透水系数、孔隙率的影响。结果表明：骨料粒径、水胶比、目标孔隙率对透水混凝土性能的影响较大，掺入适量粉煤灰、硅灰能在一定程度上提高透水混凝土性能；28 d抗压强度最优组合为骨料粒径6~9 mm、水胶比0.28、目标孔隙率20%、粉煤灰掺量20%、硅灰掺量2%；透水系数最优组合为骨料粒径9~12 mm、水胶比0.31、目标孔隙率30%、粉煤灰掺量15%、硅灰掺量4%；孔隙率最优组合为骨料粒径3~6 mm、水胶比0.31、目标孔隙率30%、粉煤灰掺量15%、硅灰掺量8%。 Abstract: Based on orthogonal test strips, the effects of aggregate particle size, water cement ratio, target porosity, fly ash content, and silica fume content on the compressive strength, permeability coefficient, and porosity of pervious concrete were studied. The results show that the aggregate particle size, water cement ratio, and target porosity have a significant impact on the performance of pervious concrete. Adding appropriate content of fly ash and silica fume can improve the performance of pervious concrete to a certain extent. The optimal combination of 28 d compressive strength is the aggregate particle size of 6~9 mm, water cement ratio of 0.28, target porosity of 20%, fly ash content of 20%, and silica fume content of 2%. The optimal combination of permeability coefficient is the aggregate particle size of 9~12 mm, water cement ratio of 0.31, target porosity of 30%, fly ash content of 15%, and silica fume content of 4%. The optimal combination of porosity is the aggregate particle size of 3~6 mm, water cement ratio of 0.31, target porosity of 30%, fly ash content of 15%, and silica fume content of 8%.

纪连杰,袁文华,孟龙,等.多因素对透水混凝土配合比及性能的影响研究[J].混凝土与水泥制品,2024(1):40-43,46. JI L J,YUAN W H,MENG L,et al.Research on the influence of multiple factors on the mix proportion and performance of pervious concrete[J].China Concrete and Cement Products,2024(1):40-43,46.

海上风电超低水胶比水泥基灌浆料的水化过程研究

王小萍1，朱嵘华1，2，*，田振亚1，2

2024年第1期

摘要

引用本文

摘要：基于水泥-硅灰-矿粉三元胶凝体系，制备了海上风电超低水胶比水泥基灌浆料，通过XRD和SEM分析了灌浆料不同龄期的水化产物与微观结构，并研究了其水化过程。结果表明：硅灰和矿粉共同促进了水泥的水化反应，且随着龄期的增加，促进作用增强；90 d时，在硅灰和矿粉的协同效应下，Ca(OH)2晶体大幅度减少，从而减少了Ca(OH)2自身晶体取向性对灌浆料造成的缺陷；水化反应生成大量低钙型C-S-H凝胶，形成排列紧密的层状构造，灌浆料内部结构致密，使其具有较高的抗压强度和耐久性能。 Abstract: Based on the cement-silica fume-mineral powder ternary cementitious system, ultra low water to binder ratio cementitious grouting material for offshore wind power was prepared. The hydration products and microstructure of the grouting material at different ages were analyzed by XRD and SEM, and the hydration process was studied. The results show that silica fume and mineral powder jointly promote the hydration reaction of cement, and the promoting effect increases with the increase of age. At 90 d, under the synergistic effect of silica fume and mineral powder, the Ca(OH)2 crystals significantly decrease, thereby reducing the defects caused by the crystal orientation of Ca(OH)2 on the grouting material. The hydration reaction generates a large number of low calcium C-S-H gel, forming a closely arranged layered structure. The internal structure of the grouting material is compact, which makes it have high compressive strength and durability.

王小萍,朱嵘华,田振亚.海上风电超低水胶比水泥基灌浆料的水化过程研究[J].混凝土与水泥制品,2024(1):44-46. WANG X P,ZHU R H,TIAN Z Y.Research on hydration process of cement based grouting material for offshore wind power with ultra low water to binder ratio[J].China Concrete and Cement Products,2024(1):44-46.

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