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

冻融循环对完全碳化混凝土轴拉性能的影响

周雁玲，曹大富，葛文杰，张鑫，董政

2021年第6期

摘要

引用本文

摘要：为研究冻融作用对完全碳化混凝土轴拉性能的影响，制作了C30、C40、C45三个强度等级的混凝土试件，经完全碳化后进行冻融循环试验和轴心受拉试验。结果表明：完全碳化使C30、C40和C45混凝土的峰值应力分别上升8.7%、9.7%和12.1%，峰值应变分别上升1.9%、7.2%和9.6%；随冻融循环次数的增加，混凝土受拉峰值应力和峰值应变不断下降，且混凝土强度等级越低，下降速度越快。根据碳化后不同冻融循环次数时混凝土的峰值应力和峰值应变数据变化情况，提出了相应的拟合公式。根据试验结果拟合了受拉应力-应变上升段曲线，结果表明：拟合效果良好。 Abstract: In order to study the influence of freeze-thaw on the axial tensile property of concrete after full carbonation, the specimens of C30, C40 and C45 were prepared. After full carbonation, freeze-thaw cycles and axial tensile tests were carried out. The results show that full carbonation increases the peak stress of C30, C40 and C45 concrete by 8.7%, 9.7% and 12.1%, and the peak strain by 1.9%, 7.2% and 9.6% respectively. With the increase of freeze-thaw cycles, the peak tensile stress and strain of concrete decrease. The lower the concrete grade, the faster the changing rate. According to the data changes of peak stress and peak strain at different freeze-thaw times after carbonation, a fitting formula was proposed. The tensile stress-strain rising curves were fitted, and the results show that the fitting effect is good.

周雁玲,曹大富,葛文杰,等.冻融循环对完全碳化混凝土轴拉性能的影响[J].混凝土与水泥制品,2021(6):1-7. ZHOU Y L,CAO D F,GE W J,et al.The Effect of Freeze-thaw Cycles on Axial Tensile Property of Full Carbonated Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(6):1-7.

3D打印混凝土关键问题及应用展望

张启云

2021年第6期

摘要

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摘要：对3D打印混凝土材料的流变性及可打印性、层间性能及各向异性、3D打印混凝土的纤维增韧方法及协同增韧技术等关键问题进行了总结和讨论，并对3D打印混凝土的工程应用进行了分析及展望。 Abstract: The key issues for 3D printing concrete such as the rheology and printability properties of concrete materials, the interlayer and anisotropy properties of 3D printing concrete, the fiber and concurrent reinforcement technology are summarized and discussed, and the engineering application of 3D printing concrete is analyzed and prospected.

张启云.3D打印混凝土关键问题及应用展望[J].混凝土与水泥制品,2021(6):8-12,18. ZHANG Q Y.Key Issues and Application Prospects of 3D Printing Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(6):8-12,18.

多元胶凝材料水化热动力学研究

任旭1,2，张秀贞1,2，刘志超1,2，何永佳1,2，胡曙光1,2，曾波3

2021年第6期

摘要

引用本文

摘要：采用等温量热法测定了不同体系的多元胶凝材料水化放热速率和累计放热量，分析了矿物掺合料、温度和早强剂对胶凝材料水化放热过程的影响。基于Krstulovic-Dabic水化动力学模型计算了总放热量、水化时间和反应速率常数等动力学参数，讨论了不同体系胶凝材料水化反应各阶段的反应速率与反应程度的关系。结果表明：水泥、水泥-矿渣多元胶凝材料和水泥-粉煤灰多元胶凝材料的水化动力学过程可分为结晶成核与晶体生长（NG）、相边界反应（I）和扩散（D）3个阶段；在高温下和添加早强剂条件下，多元胶凝材料的水化动力学过程控制阶段为结晶成核与晶体生长（NG）和扩散（D）2个阶段。 Abstract: Hydration heat emission rate and cumulative hydration heat of different cementitious material were measured by isothermal calorimetry, and the effects of mineral admixtures, temperature and hardening accelerator on the hydration process of cementitious materials were analyzed. Based on the Krstulovic-Dabic hydration kinetic model, the kinetic parameters such as total hydration heat, hydration time and reaction rate constant were calculated, and the relationship between the reaction rate and the degree of hydration was discussed. The results show that the hydration kinetics of cement, cement-slag binder and cement-fly ash binder can be divided into 3 stages (NG, I and D), and the hydration kinetics of multiple cementitious materials under high temperature and hardening accelerator can be controled by 2 stages (NG and D).

任旭,张秀贞,刘志超,等.多元胶凝材料水化热动力学研究[J].混凝土与水泥制品,2021(6):13-18. REN X,ZHANG X Z,LIU Z C,et al.Study on Hydration Thermodynamics and Kinetics of Multiple Cementitious Materials[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(6):13-18.

基于耗散能理论的橡胶自密实混凝土疲劳力学性能研究

田华轩，陈徐东，陈晨，刘志恒

2021年第6期

摘要

引用本文

摘要：为研究橡胶自密实混凝土在循环荷载作用下的疲劳寿命，利用MTS液压伺服试验机进行了橡胶自密实混凝土四点弯曲疲劳试验。基于能量法分析了橡胶自密实混凝土的能量耗散特性。研究结果表明：橡胶自密实混凝土的单周疲劳耗散能wd呈现出明显的阶段性，其中，B阶段为主要阶段，且基本保持恒定；同一加载频率下，wd与应力水平呈指数关系；同一应力水平下，加载频率越高，wd越大；在低应力水平时的临界耗散能Wcd大于高应力水平时的临界耗散能，且Wcd随应力水平近似线性降低。此外，提出了一种基于耗散能的橡胶自密实混凝土的疲劳寿命预测方法，并与试验结果进行了对比，验证了该预测方法的有效性。 Abstract: In order to study the fatigue life of rubber self-compacting concrete under cyclic loading, the four-point bending fatigue test of rubber self-compacting concrete was carried out using MTS hydraulic servo testing machine, and the energy dissipation characteristics of rubber self-compacting concrete were analyzed based on the energy method. The results show that the single-cycle fatigue dissipation energy wd of rubber self-compacting concrete presents an obvious three-stage nature, of which the second stage is the main stage and remains basically constant. Under the same loading frequency, wd has an exponential relationship with the stress level, and under the same stress level , the higher the loading frequency, the greater wd. The critical dissipation energy Wcd at low stress levels is greater than the critical dissipation energy at high stress levels, and Wcd decreases approximately linearly with the load level. In addition, a method for predicting the fatigue life of rubber self-compacting concrete based on dissipated energy is proposed and compared with the test results to verify the effectiveness of the prediction method.

田华轩,陈徐东,陈晨,等.基于耗散能理论的橡胶自密实混凝土疲劳力学性能研究[J].混凝土与水泥制品,2021(6):19-24. TIAN H X,CHEN X D,CHEN C,et al.Study on Fatigue Mechanical Property of Rubber Self-compacting Concrete Based on Energy Dissipation[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(6):19-24.

自密实补偿收缩高强钢管混凝土的制备及应用

周孝军1,2，庞帅1,2，丁庆军2,3，牟廷敏2,4，彭健秋1,2，李成君2,5

2021年第6期

摘要

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摘要：为解决高强钢管混凝土组合结构高墩的主管内高抛混凝土与大流动性、低收缩协同提升的难题，研究了胶凝材料组成体系、骨料母岩强度对混凝土工作性和力学性能的影响，探究了膨胀剂掺量对混凝土体积稳定性的影响，并通过SEM分析了高强钢管混凝土的微观结构。结果表明：硅灰与粉煤灰微珠复掺能有效降低混凝土的黏度；母岩强度较高的玄武岩能保证后期强度稳定增长；掺35 kg/m3的膨胀剂能保证混凝土的体积稳定性；微观结构显示混凝土具有致密的结构、饱满的界面过渡区。掺硅灰、粉煤灰微珠与适量膨胀剂，利用玄武岩碎石能制备性能优异的自密实补偿收缩高强混凝土，并将其成功应用于四川凉山金阳河特大桥组合结构桥墩。 Abstract: In order to solve the problem of synergistic improvement of high throwing, large fluidity, and low shrinkage in the main pipes of the high concrete filled steel tube composite structure high pier, the effects of cementitious material composition system and aggregate mother rock strength on the working performance and mechanical properties of concrete were studied. The effect of the amount of expansion agent on the volume stability of concrete was investigated. The microstructure of high-strength steel tube concrete was analyzed by SEM. The results show that the mineral admixture system of silica fume and fly ash microbeads can effectively reduce the viscosity of the concrete. The basalt with high mother rock strength can guarantee the stable growth of the later strength. The expansion agent of 35 kg/m3 can guarantee the concrete volume stability performance. The microstructure shows that the concrete has a dense structure and a full interface transition zone. With the addition of silica fume and fly ash microbeads and an appropriate amount of expansion agent, the self-compacting shrinkage-compensating high-strength concrete was prepared with excellent performance and it was successfully applied to the combination structure of Jinyanghe Bridge in Liangshan, Sichuan Pier.

周孝军,庞帅,丁庆军,等.自密实补偿收缩高强钢管混凝土的制备及应用[J].混凝土与水泥制品,2021(6):25-29. ZHOU X J,PANG S,DING Q J,et al.Application and Preparation of Self-compacting Shrinkage-compensating High-strength Concrete for Steel Tube[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(6):25-29.

关于预拌混凝土企业开展绿色建材产品认证自评价工作的要点

魏霞，李卫东，梁宏伟

2021年第6期

摘要

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摘要：绿色建材产品认证作为一项新的认证制度目前正在全国范围内有序推进。通过对预拌混凝土企业开展绿色建材产品认证前自评价工作的研究，分析了评价标准、评价项目、评价结果以及开展评价工作的步骤和方法，为预拌混凝土企业开展自评价工作提供参考。 Abstract: Green building materials products certification is a new certification system, which is proceeding in nationwide. Through research the self-assessment work before green building materials product certification in ready-mixed concrete enterprises, the assessment criteria, assessment items, assessment result and the steps and methods were analyzed during the assessment work to provide the reference for ready-mixed concrete enterprises.

魏霞,李卫东,梁宏伟.关于预拌混凝土企业开展绿色建材产品认证自评价工作的要点[J].混凝土与水泥制品,2021(6):30-34. WEI X,LI W D,LIANG H W.The Key Points to Prepare the Self-evaluation of Green Building Materials Product Certification for Ready-mixed Concrete Enterprises[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(6):30-34.

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