混凝土研究_2020_《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

不同水压下混凝土断裂能弱化效应试验研究

胡少伟，王洋，孙岳阳，陆俊

2020年第12期

摘要

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摘要：为了研究混凝土在水力劈裂过程中的断裂能变化规律，分析了水力劈裂中的各荷载做功，建立了水压力下断裂能的计算公式，开展了12组混凝土水力劈裂试验，得出了水压力对混凝土断裂能的影响规律。结果表明：水压力作用下混凝土的断裂能减小，水压力越大，混凝土的断裂能越小；混凝土在水力劈裂过程中的断裂能弱化效应不可忽略，在0.3 MPa水压力下，该弱化效应随水压力增加呈线性递增趋势。 Abstract: In order to study the influence of water pressure on fracture energy of concrete under hydraulic fracturing, the work done by each load in hydraulic fracturing test was analyzed, the calculation formula of fracture energy under water pressure was established, and 12 groups of hydraulic fracturing tests of concrete were carried out. The results show that the fracture energy of concrete decreases under the action of water pressure, and the greater the water pressure, the smaller the fracture energy of concrete, which shows that the weakening effect of the fracture energy in the process of concrete hydraulic fracturing cannot be ignored, the weakening effect increases linearly with the increase of water pressure which not exceed 0.3 MPa.

胡少伟,王洋,孙岳阳,等.不同水压下混凝土断裂能弱化效应试验研究[J].混凝土与水泥制品,2020(12):6-10. HU S W,WANG Y,SUN Y Y,et al.Experimental Study on Fracture Energy of Concrete Under Different Hydraulic Pressure[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(12):6-10.

粉煤灰对UHPC性能及微观结构的影响

杭美艳1，孙忠科1，郭艳梅2

2020年第12期

摘要

引用本文

摘要：研究了粉煤灰取代量对超高性能混凝土（UHPC）的流动度、抗压强度、抗折强度、微观结构以及钢纤维与基体黏结界面的影响。结果表明：粉煤灰取代量与混凝土流动度呈正相关；UHPC的抗压强度随粉煤灰取代量的增加呈先降低后升高的趋势；UHPC的抗折强度随粉煤灰取代量的增加呈先升高后降低的趋势；通过SEM结果发现，随粉煤灰取代量的增加，混凝土微观结构的密实度呈先减小后增大的趋势；UHPC基体与钢纤维的黏结性能呈先增大后减小的趋势。 Abstract: The effect of the replacecement amount of fly ash on fluidity, compressive strength, flexural strength, microstructure of UHPC and the bonding interface between steel fiber and UHPC matrix was studied. The results show that the replacement amount of fly ash is positively correlated with the fluidity of UHPC. The compressive strength of UHPC decreases first and then increases with the increase of the replacement amount of fly ash. The flexural strength of UHPC tends to increase first and then decrease with the increase of the replacement amount of fly ash. Through SEM scanning, it is found that the density of UHPC microstructure shows a decreasing trend with the increase of the replacement amount of fly ash and then increases. The bonding performance of UHPC matrix and steel fiber increases first and then decreases.

杭美艳,孙忠科,郭艳梅.粉煤灰对UHPC性能及微观结构的影响[J].混凝土与水泥制品,2020(12):11-14,19. HANG M Y,SUN Z K,GUO Y M.Effect of Fly Ash on Property and Microstructure of UHPC [J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(12):11-14,19.

基于正交试验的自密实重晶石混凝土配合比设计及性能研究

石建军，凌颜，张志恒，刘华良，杨晓峰，王灿，张志君，李奇

2020年第12期

摘要

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摘要：采用重晶砂、重晶石作为自密实混凝土骨料，通过优化骨料级配、掺入适量的CRT玻璃粉和调整重晶石骨料比例等技术手段，成功配制出了工作性良好、表观密度为3 200 kg/m3的自密实重晶石混凝土，并通过正交试验研究砂率、水胶比和减水剂对混凝土工作性和抗压强度的影响。结果表明：随着砂率的增大，混凝土工作性降低，而抗压强度逐渐增强；水胶比增大，V型漏斗时间和抗压强度减少；减水剂用量增加可以提高混凝土的流动性，存在最佳掺量2.4%；使用功效系数法综合分析得到了混凝土的最佳配合比为砂率45%，水胶比0.43，减水剂2.3%。 Abstract: Using heavy crystal sand and barite as aggregates of self-compacting concrete, the self-compacting barite concrete with good working performance and apparent density of 3 200 kg/m3 was successfully prepared by optimizing aggregate gradation, adding proper amount of CRT glass powder and adjusting the proportion of barite aggregate. The effects of sand ratio, water-binder ratio and water reducing agent on the workability and compressive strength of concrete were investigated by orthogonal test. The results show that as the sand rate increases, the working performance decreases, and the compressive strength gradually increases. As the water-binder ratio increases, the V-shaped funnel time and compressive strength decrease. As the amount of water reducing agent increases, the fluidity of the concrete increases first and then decreases, and there is an optimal content of 2.4%. The comprehensive analysis by the efficacy coefficient method is available. The best mix proportion is: sand rate 45%, water-binder ratio 0.43, water reducing agent 2.3%.

石建军,凌颜,张志恒,等.基于正交试验的自密实重晶石混凝土配合比设计及性能研究[J].混凝土与水泥制品,2020(12):15-19. SHI J J,LING Y,ZHANG Z H,et al.Mix Proportion Design and Performance Research of Self-compacting Barite Concrete Based on Orthogonal Test[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(12):15-19.

冻融损伤混凝土力学性能研究与等效冻融循环次数计算模型

齐柠1，战美秋2，李梅1

2020年第12期

摘要

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摘要：为研究人工气候环境下冻融损伤混凝土的力学性能退化规律，以冻融循环次数（FTCs）、混凝土强度为设计参数，共设计制作了21组混凝土试块，先后对其进行冻融循环试验与轴心受压试验。结果表明：随冻融循环次数的增加，抗压强度逐渐降低，且降低速率逐渐增大；不同强度等级混凝土的相对动弹性模量P均逐渐降低，且降低速率大致相等；随设计混凝土强度等级的增大，相对抗压强度增加，且增加速率逐渐增大；当冻融循环次数<100时，相对动弹性模量基本不变；当冻融循环次数>100时，相对动弹性模量则逐渐增大。基于试验结果，得到了不同冻融条件下的等效冻融循环次数计算模型，实现了不同冻融条件研究结果的相互利用与对比验证。 Abstract: In order to study the degradation law of mechanical properties of frozen-thawed damage concrete in artificial climate, using the number of freeze-thaw cycles(FTCs) and concrete strength as design parameters, a total of 21 sets of cubic concrete test blocks were designed and manufactured. The freeze-thaw cycle test and the axial compression test were successively performed. The experimental results show that as the number of FTCs increases, the cubic compressive strength gradually decreases, and the decrease rate gradually increases. And the relative dynamic elastic modulus P of different strength levels gradually decreases, and the decrease rate is approximately equal. With the increase of design concrete strength grade, the relative compressive strength increases gradually, and the increasing rate increases gradually. The relative dynamic elastic modulus is basically unchanged when the number of FTCs is less than 100, and gradually increases when the number of FTCs is more than 100. Based on the test results, according to the principle of the same compressive strength loss, the artificial climate rapid freeze-thaw technique test conditions and the freeze-thaw conditions of "fast freeze method" are equivalent, and the calculation model of the equivalent FTCs under different freeze-thaw conditions is obtained, so as to realize the mutual utilization and comparative verification of the research results under different freeze-thaw conditions.

齐柠,战美秋,李梅.冻融损伤混凝土力学性能研究与等效冻融循环次数计算模型[J].混凝土与水泥制品,2020(12):20-25. QI N,ZHAN M Q,LI M. Study on Mechanical Properties of Frost-damaged Concrete and Calculation Model of Equivalent Freeze-thaw Cycles [J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(11):20-25.

混凝土自崩实例分析

张亚涛，郑继，朱田生，徐良，吴超

2020年第12期

摘要

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摘要：基于工程实例中混凝土自崩现象，通过X射线荧光光谱分析、XRD分析和模拟试验等对可疑物进行了辨别。结果表明：可疑物为钢渣，其在混凝土中缓慢水化导致体积膨胀，最终造成表层混凝土自崩。同时，通过模拟试验，分析了引起该类型混凝土自崩所需要的外部环境条件，并给出了防止该现象继续发生的建议。 Abstract: Based on the phenomenon of concrete self-collapse in engineering examples, suspicious substances were identified through X-ray fluorescence spectrum analysis, XRD analysis and simulation tests. The results show that the suspicious substances are steel slag, which slowly hydrate in the concrete. It causes volume expansion and eventually causes the surface concrete to collapse. At the same time, through simulation tests, the external environmental conditions required to cause the concrete to collapse are analyzed, and some suggestions are provided to prevent this phenomenon from continuing.

张亚涛,郑继,朱田生,等.混凝土自崩实例分析[J].混凝土与水泥制品,2020(12):26-29. ZHANG Y T,ZHENG J,ZHU T S,et al.Analysis of Concrete Self-collapse[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(12):26-29.

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