混凝土研究_2022_《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

海洋侵蚀环境下超高性能混凝土的力学与耐久性能研究

张志豪1,2，陈露一1,2，黄有强1,2，盖珂瑜1

2022年第7期

摘要

引用本文

摘要：通过加速劣化试验方法研究了超高性能混凝土（UHPC）在模拟海洋侵蚀环境下的力学和耐久性能。结果表明：海水养护下UHPC的力学性能受开始浸泡时间的影响较小，长期力学性能发展比较稳定；UHPC具有良好的适应性和耐久性能，冻融循环对UHPC性能的影响相对较大，但介质类型对其性能的影响较小；随着硫酸盐干湿循环次数的增加，UHPC的相对动弹性模量和抗压强度耐蚀系数先增加后降低，质量损失增加；硫酸盐干湿循环会导致UHPC表面露出的钢纤维锈蚀，但内部结构无损伤，钢纤维与基体结合紧密。 Abstract: The mechanical properties and durability of ultra-high performance concrete(UHPC) under marine environment were investigated by accelerated deterioration test. The results show that the mechanical properties of UHPC under seawater curing are less affected by the initial immersion time, and the long-term mechanical properties are relatively stable. UHPC has good adaptability and durability. Freeze-thaw cycles have a relatively large effect on UHPC performance, but media type has less effect on UHPC performance. With the increase of the number of dry and wet cycles of sulfate, the relative dynamic elastic modulus and compressive strength corrosion resistance coefficient of UHPC first increase and then decrease, and the mass loss increases. The dry and wet cycles of sulfate lead to steel fiber corrosion on the surface, but the internal structure is not damaged, and the steel fiber is closely combined with the matrix.

张志豪,陈露一,黄有强,等.海洋侵蚀环境下超高性能混凝土的力学与耐久性能研究[J].混凝土与水泥制品,2022(7):1-4,9. ZHANG Z H,CHEN L Y,HUANG Y Q,et al.Study on Mechanical Proporties and Durability of Ultra-high Performance Concrete Under Marine Erosion Environment[J].China Concrete and Cement Products,2022(7):1-4,9.

石墨改性EPS颗粒对超轻泡沫混凝土性能的影响

康升荣，程宝军，麻鹏飞，史博元

2022年第7期

摘要

引用本文

摘要：采用普通硅酸盐水泥、气凝胶粉、石墨改性EPS颗粒、发泡剂等制备了干密度约为120 kg/m3的石墨改性EPS颗粒超轻泡沫混凝土，研究了石墨改性EPS颗粒对其密度、力学性能、吸水率、导热系数和孔结构的影响。结果表明：当石墨改性EPS颗粒掺量为30%时，超轻泡沫混凝土的各项性能最优，抗压强度为0.25 MPa，吸水率为10.3%，导热系数为0.032 6 W/(m·K)；随着石墨改性EPS颗粒掺量的增加，损泡率明显增大，孔径分布和孔结构参数发生明显改变。 Abstract: The foam concrete with a dry density of 120 kg/m3 was prepared by ordinary portland cement, aerogel powder, graphite modified EPS particles, foaming agent and additive. The effects of graphite modified EPS particles content on the density, mechanical properties, water absorption, thermal conductivity, and pore structure of foam concrete were studied. The results show that when graphite modified EPS particles with the content of 30% are added, the foam concrete has the best properties, the compressive strength is 0.25 MPa, the water absorption is 10.3%, and the thermal conductivity is 0.032 6 W/(m·K). With the increase of the content of graphite modified EPS particles, the bubble loss rates increase obviously, and the pore size distribution and pore structure parameters change obviously.

康升荣,程宝军,麻鹏飞,等.石墨改性EPS颗粒对超轻泡沫混凝土性能的影响[J].混凝土与水泥制品,2022(7):5-9. KANG S R,CHENG B J,MA P F,et al.Influence of Graphite Modified EPS Particles on the Performance of Ultra-light Foam Concrete[J].China Concrete and Cement Products,2022(7):5-9.

超缓释降黏型外加剂在泵送顶升自密实混凝土中的应用

李继存1，赵少鹏2,3，陆加越2,3，杨晓奇2,3

2022年第7期

摘要

引用本文

李继存,赵少鹏,陆加越,等.超缓释降黏型外加剂在泵送顶升自密实混凝土中的应用[J].混凝土与水泥制品,2022(7):10-13,19. LI J C,ZHAO S P, LU J Y,et al.Application of Super Slow-release Viscosity-reducing Admixture in Pumping-up Self-compacting Concrete[J].China Concrete and Cement Products,2022(7):10-13,19.

胶砂比对UHPC高温力学性能及微观结构的影响

王宏1,2，王丹丹3，朱平1,2，何长龙1,2，王桂敏1,2，盖梅香1,2，孙晓光1,2

2022年第7期

摘要

引用本文

摘要：利用铁尾矿砂制备了超高性能混凝土（UHPC），研究了在高温环境下不同胶砂比（1∶0.8、1∶0.9、1:1.0、1∶1.1）对UHPC试件力学性能的影响，测定了高温下UHPC的孔结构，并用SEM表征了UHPC的微观结构，探讨了胶砂比对UHPC高温性能影响的机理。结果表明，随着温度的不断升高，不同胶砂比的UHPC力学性能出现了不同程度的下降，其中，胶砂比为1∶1.0的UHPC在各个目标温度下均表现出相对较高的力学性能；微观分析表明胶砂比为1∶1.0的UHPC基体比胶砂比为1∶0.8的UHPC基体更加密实，在高温作用下裂缝宽度更小，且基体与钢纤维的结合能力更强，有效降低了钢纤维在高温下的破坏程度。 Abstract: Ultra-high performance concrete(UHPC) was prepared by iron tailings sand. The effect of different binder-sand ratio(1∶0.8, 1∶0.9, 1∶1.0, 1∶1.1) on the mechanical properties of UHPC at high temperature was studied. The pore structure of UHPC at high temperature was determined. The microstructure of UHPC was charactered by SEM, and the mechanism of the effect of binder-sand ratio on the high temperature properties of UHPC was discussed. The results show that with the increase of temperature, the mechanical properties of UHPC with different binder-sand ratio decrease in varying degrees, and the UHPC with 1∶1.0 binder-sand ratio shows relatively high mechanical properties at each target temperature. Pore structure and SEM analysis show that UHPC matrix with 1∶1.0 binder-sand ratio is denser than UHPC matrix with 1∶0.8 binder-sand ratio, and crack width is smaller under high temperature. In addition, UHPC matrix with 1∶1.0 binder-sand ratio has stronger bonding ability with steel fiber, which effectively reduces the damage degree of steel fiber at high temperature.

王宏,王丹丹,朱平,等.胶砂比对UHPC高温力学性能及微观结构的影响[J].混凝土与水泥制品,2022(7):14-19. WANG H,WANG D D,ZHU P,et al.Effect of Binder-sand Ratio on High-temperature Mechanical Properties and Microstructure of UHPC[J].China Concrete and Cement Products,2022(7):14-19.

纳米材料修复混凝土道面微裂缝的研究

王后裕1，方新宇1，刘海涛2，曹海琳2，任韦波1，吕晓聪3，江志华4，马腾4

2022年第7期

摘要

引用本文

摘要：为了修复机场混凝土道面微裂缝，采用液相溶胶-凝胶法合成了一种硅聚集体纳米修复材料，并研究了该纳米修复材料对道面混凝土抗压、抗折、防水、抗渗、抗氯离子渗透、抗冻、耐磨等性能的改善效果，探讨了其修复机理。结果表明：经纳米材料修复后，含微裂缝混凝土的抗压强度提高了1.1倍，抗折强度提高了90%，抗渗性能提高了1.6倍，抗氯离子渗透性能提高了60%，抗冻性能提高了70%，耐磨性能提高了65%，防水性能有显著改善，摩擦系数变化不大。 Abstract: To repair the micro-cracks in the concrete pavement of the airport, a silicon aggregate nano-repair material was synthesized by liquid sol-gel method. The improvement effects of nano-repair material on the properties of pavement concrete such as compressive strength, flexural strength, waterproofing, impermeability, chloride ion penetration resistance, freeze-thaw resistance and wear resistance were studied, and its repair mechanism was discussed. The results show that the compressive strength, flexural strength, impermeability, chloride ion penetration, freeze-thaw resistance and wear resistance of concrete with micro-cracks are increased by 1.1 times, 90%, 1.6 times, 60%, 70% and 65%, respectively. The waterproof performance is significantly improved, and the surface friction coefficient has not changed much.

王后裕,方新宇,刘海涛,等.纳米材料修复混凝土道面微裂缝的研究[J].混凝土与水泥制品,2022(7):20-24. WANG H Y,FANG X Y,LIU H T,et al.Study on Micro-cracks Repairing of Concrete Pavement with Nano-repair Materials[J].China Concrete and Cement Products,2022(7):20-24.

混凝土弹塑性单轴受压分形损伤本构关系研究

谢明1，汪鹏1，郑山锁2，刘佳豪1，王梓1，周静静1

2022年第7期

摘要

引用本文

摘要：考虑混凝土单轴受压破坏机理，在混凝土静力损伤基础上引入弹簧-摩擦块模型，以模拟混凝土弹塑性阶段的细观结构变化。基于细观模型中弹簧、摩擦块对混凝土断裂面的影响，分析了混凝土受压损伤的破坏规律，建立了不同强度等级混凝土弹塑性单轴受压损伤本构模型，采用混凝土分形曲面模拟方法对所建模型进行了验证。结果表明：所建立的模型能够较好描述混凝土的塑性变形，对混凝土弹塑性的离散范围具有良好的预测能力。 Abstract: Considering the failure mechanism of concrete under uniaxial compression, on the basis of concrete static damage, a spring-friction block model was introduced to simulate the meso-structural changes of concrete in the elastic-plastic stage. Based on the influence of the spring and friction block on the fracture surface of concrete in the mesoscopic model, the failure law of concrete compressive damage was analyzed, and the elastic-plastic uniaxial compressive damage constitutive model of concrete with different strength grades was established. The model was verified by the concrete fractal surface simulation method. The results show that the established model can describe the impact of concrete plastic deformation well, and has a good ability to predict the elastoplastic dispersion range of concrete.

谢明,汪鹏,郑山锁,等.混凝土弹塑性单轴受压分形损伤本构关系研究[J].混凝土与水泥制品,2022(7):25-29,39. XIE M,WANG P,ZHENG S S,et al.Fractal Damage Constitutive Relation of Concrete Elastoplastic Uniaxial Compression[J].China Concrete and Cement Products,2022(7):25-29,39.

HCSA抗裂增强混凝土的应用研究

刘立1，赵宇洋2，徐宁1，季彩云1

2022年第7期

摘要

引用本文

摘要：研究了HCSA抗裂增强材料对混凝土强度、限制膨胀率、温度应力的影响，并分析了蒸养与非蒸养条件下掺抗裂增强材料混凝土的强度发展变化情况。结果表明：抗裂增强材料可显著提高混凝土的抗裂性，当水胶比为0.36、抗裂增强材料掺量为70 kg/m3时，混凝土强度发展良好，且限制膨胀率较高；抗裂增强材料可显著降低混凝土的温度敏感性，当抗裂增强材料掺量为50 kg/m3时，混凝土试件最大压应力提高了119%，断裂应力下降了13%，断裂温度降低了37%；采用抗裂增强材料代替粉煤灰，在免蒸养条件下，混凝土1 d强度比提高了192%，在蒸养条件下，1 d强度比提高了196%。 Abstract: The effects of HCSA anti-cracking reinforcement materials on the strength, limiting expansion rate and temperature stress of concrete were investigated. The strength development of concrete under steam curing and non-steam curing after adding anti-cracking reinforcement materials were analyzed. The results show that the HCSA anti-cracking reinforcement material can significantly improve the crack resistance of concrete. When the W/B is 0.36 and the content of the anti-cracking reinforcement material is 70 kg/m3, the concrete strength developed well, and the limiting expansion rate is high. The anti-cracking reinforcement material can significantly reduce the temperature sensitivity of concrete. When the anti-cracking reinforcement material is added at 50 kg/m3, the maximum compressive stress of concrete specimens is increased by 119%, the fracture stress is reduced by 13% and the fracture temperature is reduced by 37%. When fly ash is instead by anti-cracking reinforcement material, the 1 d strength ratio of concrete increases by 192% under the non-steam curing conditions, the 1 d intensity ratio increases by 196% under the steam curing conditions.

刘立,赵宇洋,徐宁,等.HCSA抗裂增强混凝土的应用研究[J].混凝土与水泥制品,2022(7):30-34,39. LIU L, ZHAO Y Y,XU N,et al.Application Study of HCSA Anti-cracking Reinforcement Materials in Concrete[J].China Concrete and Cement Products,2022(7):30-34,39.

硫酸盐渍土地区粉煤灰混凝土抗压强度研究

郭佳庆1,2，马艳霞1,2，聂思凡1,2，鲁生斌1,2，白继雄3

2022年第7期

摘要

引用本文

摘要：为了探究硫酸盐渍土地区粉煤灰混凝土抗压强度随侵蚀时间的变化规律，在某典型硫酸盐渍土地区埋置不同粉煤灰掺量（0、10%、15%、20%）的混凝土试件进行了硫酸盐侵蚀后的抗压强度试验和微观形貌分析，并基于BP神经网络模型预测了试件的抗压强度。试验结果表明：不同粉煤灰掺量试件的抗压强度均随着侵蚀时间的增加先升高后降低；当粉煤灰掺量为10%时，试件的抗压强度最高。SEM分析表明：540 d时大部分试件出现了微裂缝，840 d时试件均发生了劣化，但尚未破坏；当粉煤灰掺量为10%时，试件的劣化不明显；预测结果表明，侵蚀时间是影响掺粉煤灰混凝土试件抗压强度的最主要因素。 Abstract: In order to explore the change rules of the compressive strength of fly ash concrete with erosion time in the sulfate-saline soil area, concrete specimens with different fly ash content(0, 10%, 15%, 20%) were embedded in a typical sulfate-saline soil area, and the compressive strength test and microscopic morphology analysis after sulfate erosion were carried out. The compressive strength of the specimen was predicted based on the BP neural network model. The test results show that the compressive strength of fly ash concrete with different fly ash content increases first and then decreases with the increase of erosion time. At different erosion time nodes, when the fly ash content is 10%, the compressive strength of the specimen is the highest. The SEM results show that at 540 d, most of the specimens appear micro-cracks. At 840 d, all the specimens are deteriorated, but not damaged. When the fly ash content is 10%, the deterioration of the specimens is not obvious. The prediction results show that erosion time is the main factor affecting the service performance of fly ash concrete.

郭佳庆,马艳霞,聂思凡,等.硫酸盐渍土地区粉煤灰混凝土抗压强度研究[J].混凝土与水泥制品,2022(7):35-39. GUO Jia-qing1，2, MA Yan-xia1，2, NIE Si-fan,et al.Research on the Compressive Strength of Fly Ash Concrete in the Sulfate-saline Soil Area[J].China Concrete and Cement Products,2022(7):35-39.

透水混凝土的细观孔隙结构分析

刘冠志1，侯泽彪1，廖霖1，吕永斌2，李子东2，王永明2

2022年第7期

摘要

引用本文

摘要：为了探究不同骨料粒径及不同胶凝材料用量对透水混凝土内部孔隙结构的影响，采用CT扫描技术对不同骨料粒径以及不同胶凝材料用量的试件进行了试验，并使用重构软件对扫描结果进行了二维及三维分析。结果表明：主要影响透水混凝土孔隙结构的因素是骨料粒径和胶凝材料用量；孔隙结构可以看作由孔室和孔喉两部分组成，骨料粒径对孔室的影响较大，孔室的大小随着骨料粒径的增大逐渐向大孔室发展；孔喉面积主要受胶凝材料用量的影响；孔喉面积对透水混凝土的透水率有一定的影响。 Abstract: In order to explore the effects of different particle sizes of aggregates and different amounts of cementitious materials on the internal pore structure of permeable concrete, CT scanning technology was used to test specimens with different aggregate particle sizes and different amounts of cementitious materials, and reconstruction software was used. The scan results were analyzed in 2D and 3D. The results show that the factors affecting the pore structure of permeable concrete are the aggregate particle size and the amount of cementitious material. The pore structure can be regarded as consisting of two parts, the pore chamber and the pore throat, and the aggregate particle size has a great influence on the pore chamber. With the increase of aggregate particle size, the size of the pore chamber gradually develops into a large pore, and the pore throat area is mainly affected by the amount of cementitious material. Pore throat area has a certain influence on the permeability of pervious concrete.

刘冠志,侯泽彪,廖霖,等.透水混凝土的细观孔隙结构分析[J].混凝土与水泥制品,2022(7):40-44. LIU G Z,HOU Z B,LIAO L,et al.Analysis of Microscopic Pore Structure of Pervious Concrete[J].China Concrete and Cement Products,2022(7):40-44.

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