混凝土研究_2023_《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

有机膦缓凝剂的合成及其性能研究

王兵1,2，王涛1,2，杨勇1，韩正1，冉千平1,3

2023年第6期

摘要

引用本文

摘要：采用二乙烯三胺、亚磷酸、甲醛在硫酸催化下通过曼尼希反应合成了两种有机膦缓凝剂（HR-1和HR-2），并通过与聚羧酸减水剂（PCE）复配研究了其对水泥砂浆及混凝土性能的影响。结果表明：合成的有机膦缓凝剂均能有效延缓水泥水化，具有较好的缓凝性能，且HR-2的缓凝效果比HR-1更好；有机膦缓凝剂与PCE复掺，虽降低了PCE的初始分散性能，但提高了保坍性能；有机膦缓凝剂的加入能减小机制砂对PCE分散性能的影响，提高PCE对机制砂的适应性。 Abstract: Organic phosphorus retarders(HR-1 and HR-2) were synthesized by Mannish reaction of diethylenetriamine, phosphorous acid and formaldehyde under the catelysis of sulfuric acid. After compounded with polycarboxylate superplasticizer(PCE), the effects on the properties of cement mortar and concrete were studied. The results show that the synthesized organic phosphorus retarder can effectively delay cement hydration, and has good retarding performance, and the retarding effect of HR-2 is better than that of HR-1. The combination of organophosphine retarder and PCE reduces the initial dispersion performance of PCE, but improving the slump retention properties. The addition of organic phosphorus retarder can reduce the impact of manufactured sand on the dispersion performance of PCE, and improve the applicability of PCE to manufactured sand.

王兵,王涛,杨勇,等.有机膦缓凝剂的合成及其性能研究[J].混凝土与水泥制品,2023(6):1-5. WANG B,WANG T,YANG Y,et al.Study on Synthetise and Properties of Organic Phosphorus Retarder[J].China Concrete and Cement Product,2023(6):1-5.

直接电养护对混凝土力学性能的影响

杨智涵，贺炯煌，谢友均，龙广成，王凡

2023年第6期

摘要

引用本文

摘要：为研究直接电养护（DEC）对混凝土力学性能的影响，采用交流电场，进行了不同养护电压对纯水泥混凝土和粉煤灰混凝土抗压强度、内部温度以及内部电流的影响试验研究。结果表明：各组混凝土的早期抗压强度基本随养护电压的增大而增加，而后期抗压强度则基本相反；20 V电压下DEC纯水泥混凝土和粉煤灰混凝土内部峰值温度分别达到69.4 ℃、60.3 ℃，1 d抗压强度显著提升，相较于标养组分别提高了22.8%、37.0%；掺入粉煤灰提升了混凝土的电阻率，需要更高的电压才能达到等同纯水泥混凝土的养护温度；各组混凝土的内部电流大体呈先增加后降低的趋势，并随养护电压的增大而增加，说明DEC对早期混凝土的加热效率高于后期。 Abstract: In order to study the influence of direct electric curing on the mechanical properties of concrete, the influence of different curing voltages on the compressive strength, internal temperature and internal current of pure cement concrete and fly ash concrete was studied by using AC electric field. The results show that the early compressive strength of each group of concrete basically increases with the increase of curing voltage, while the late compressive strength is basically opposite. Under 20 V voltage, the internal peak temperatures of DEC pure cement concrete and fly ash concrete reach 69.4 ℃ and 60.3 ℃ respectively, and the 1 d compressive strength of DEC pure cement concrete and fly ash concrete are increased by 22.8% and 37.0% respectively compared with the standard curing group. Adding fly ash increases the resistivity of concrete, which requires higher voltage to reach the curing temperature of pure cement concrete. The internal current of each group of concrete generally increases first and then decreases, and increases with the increase of curing voltage, indicating that the heating efficiency of DEC on early concrete is higher than that of late concrete.

杨智涵,贺炯煌,谢友均,等.直接电养护对混凝土力学性能的影响[J].混凝土与水泥制品,2023(6):6-10. YANG Z H,HE J H,XIE Y J,et al.Effect of Direct Electric Curing on the Mechanical Properties of Concrete[J].China Concrete and Cement Product,2023(6):6-10.

低胶凝材料自密实混凝土的制备及性能研究

虞冬冬1，温金保2,3,4，祝烨然2,3,4，夏强2,3,4，唐修生2,3,4，杜志芹2,3,4，刘兴荣2,3,4

2023年第6期

摘要

引用本文

摘要：以自密实混凝土（SCC）的工作性及28 d抗压强度为评价指标，采用正交试验法进行了低胶凝材料SCC性能的因素极差分析与方差分析。结果表明：试验设计的水胶比、砂率、粉煤灰和矿粉掺量对低胶凝材料SCC的工作性及28 d抗压强度的影响均不显著，但水胶比与粉煤灰掺量的影响程度相对较大，且极差分析与方差分析结果基本一致。所制备的低胶凝材料SCC具有优异的工作性、力学性能及耐久性能，坍落扩展度经时损失仅为8.1%，初始坍落扩展度与J环扩展度差值为20 mm，离析率为4.9%，后期强度增长幅度大，抗水与抗氯离子渗透性能好。 Abstract: Taking the workability and 28 d compressive strength of self-compacting concrete(SCC) as the evaluation indexes, the factor range analysis and variance analysis of the performance of low cementitious material SCC were carried out by using orthogonal test method. The results show that the effects of water binder ratio, sand ratio, fly ash content and mineral powder content on the workability and 28 d compressive strength of low cementitious material SCC are not significant, but the effects of water binder ratio and fly ash content are relatively large, and the results of range analysis are basically consistent with those of variance analysis. The prepared low cementitious material SCC has excellent workability, mechanical properties and durability, the loss of slump expansion over time is only 8.1%, the difference between the initial slump expansion and the J-ring expansion is 20 mm, the segregation rate is 4.9%, the late strength growth is large, and the water resistance and chloride ion penetration resistance are good.

虞冬冬,温金保,祝烨然,等.低胶凝材料自密实混凝土的制备及性能研究[J].混凝土与水泥制品,2023(6):11-15. YU D D,WEN J B,ZHU Y R,et al.Study on Preparation and Properties of Self-Compacting Concrete with Low Cementitious Materials[J].China Concrete and Cement Product,2023(6):11-15.

疲劳荷载作用下混凝土损伤力学特征试验研究

甄治国

2023年第6期

摘要

引用本文

摘要：利用GCTS动态岩石三轴仪试验系统对混凝土试件进行了单轴条件下不同应力幅值和频率的周期疲劳荷载试验，研究了混凝土疲劳损伤破坏特征、变形机理及能量演化规律。结果表明：增大疲劳幅值与频率，混凝土更容易发生疲劳损伤破坏；单轴疲劳荷载作用下试件破坏主要分为初始加载阶段、疲劳循环阶段和疲劳破坏阶段三个阶段，其中，疲劳破坏阶段试件的弹性模量降低，滞回环面积增大，弹性能密度降低，耗散能密度增大，出现多条拉伸裂纹与贯通裂纹，直至发生损伤破坏；随着疲劳幅值及频率增大，试件破坏时的总能量密度及耗散能密度增幅增大；根据疲劳荷载作用下不同循环阶段的能量演化规律可以预测混凝土的疲劳损伤过程。 Abstract: The GCTS dynamic rock triaxial test system was used to carry out the cyclic load fatigue test of concrete samples under uniaxial conditions with different stress amplitude and frequency, and the fatigue failure characteristics, deformation mechanism and energy evolution law of concrete were studied. The results show that with the increase of fatigue amplitude and frequency, concrete is more prone to fatigue damage. The failure of samples under uniaxial fatigue load can be divided into three stages: initial loading stage, fatigue cycle stage and fatigue failure stage respectively. At the fatigue failure stage, the elastic modulus of the sample decreases, the hysteresis loop area increases, the elastic energy density decreases, and the dissipated energy density increases, and multiple tensile cracks and through-through cracks appear until damage failure occurs. With the increase of fatigue amplitude and frequency, the total energy density and dissipated energy density increase when the specimen is damaged. The energy evolution law at different cycle stages under fatigue load can be used to predict the fatigue damage of concrete.

甄治国.疲劳荷载作用下混凝土损伤力学特征试验研究[J].混凝土与水泥制品,2023(6):16-20,25. ZHEN Z G.Experimental Study on Damage Mechanical Characteristics of Concrete Under Fatigue Load[J].China Concrete and Cement Product,2023(6):16-20,25.

微纳米气泡水对混凝土性能影响研究综述

张毅1，王威2

2023年第6期

摘要

引用本文

摘要：总结了微纳米气泡水对混凝土性能的影响规律。在介绍微纳米气泡水制备方法、特性及其对混凝土性能影响的基础上，分析了微纳米气泡水对混凝土性能的影响机理，并对其在混凝土领域的进一步研究和应用提出了建议。 Abstract: The influence law of micro-nano bubble water on the properties of concrete is summarized. Based on introducing the preparation method and characteristics of micro-nano bubble water and its influence on concrete properties, the mechanism of the influence of micro-nano bubble water on concrete properties is analyzed, and suggestions are put forward for further research and application in the field of concrete.

张毅,王威.微纳米气泡水对混凝土性能影响研究综述[J].混凝土与水泥制品,2023(6):21-25. ZHANG Y,WANG W.Review on the Effect of Micro-Nano Bubble Water on the Properties of Concrete[J].China Concrete and Cement Product,2023(6):21-25.

机制砂取代率对高温后混凝土性能的影响

逄鲁峰1，庞伟琪1，张硕2，赵勇1，安昊文1，黄凌苗1

2023年第6期

摘要

引用本文

摘要：研究了不同机制砂取代率对混凝土表观密度和高温后混凝土试件颜色变化、质量损失以及抗压强度的影响，建立了机制砂取代率与混凝土的表观密度、不同机制砂取代率下的温度与混凝土的质量损失率、不同机制砂取代率下的温度与混凝土的抗压强度损失的关系。结果表明：随着机制砂取代率的提高，混凝土的表观密度逐渐增大；当温度为200~1 000 ℃时，混凝土试件颜色由灰色变至红色再到白色，且温度越高试件开裂及脱落现象越严重，质量损失也越大，全机制砂混凝土的质量损失低于全河砂混凝土；当温度为200 ℃时，混凝土的抗压强度损失率逐渐降低；当温度超过200 ℃时，混凝土的抗压强度损失率先升高后降低，20%机制砂取代率下，其抗压强度损失率最高，全河砂混凝土的抗压强度损失率最低；基于试验数据建立的拟合函数的拟合度较高。 Abstract: By studying the effect of different mechanism sand replacement rate on the apparent density of concrete, color change, mass loss and compressive strength loss of specimens after high temperature tests, the relationships between mechanism sand replacement rate and apparent density of concrete, temperature and mass loss rate under different mechanism sand replacement rates, and temperature and strength loss of concrete under different mechanism sand replacement rates were established. The results show that the apparent density of concrete gradually increases as the replacement rate of mechanism sand increases. The color of specimen changes from gray to red to white after 200~1 000 ℃, and the higher the temperature, the more serious the cracks and peeling phenomenon is, and the greater the quality loss is, and the quality loss of all mechanism sand concrete is lower than that of all river sand concrete. The compressive strength loss rate gradually decreases at 200 ℃, and increases first and then decreases beyond 200 ℃. The compressive strength loss rate is highest at 20% mechanism sand replacement rate, and the compressive strength loss rate is lowest for all river sand concrete, the fitting functions based on the test datas are established with good fit.

逄鲁峰,庞伟琪,张硕,等.机制砂取代率对高温后混凝土性能的影响[J].混凝土与水泥制品,2023(6):26-30,35. PANG L F,PANG W Q,ZHANG S,et al.Effect of Mechanism Sand Replacement Rate on the Performance of Concrete After High Temperature[J].China Concrete and Cement Product,2023(6):26-30,35.

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