第九期_2018_《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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第九期

高炉渣超细粉火山灰活性评价方法研究

黄阳1，黄艳2,1，向香源1，王维清1，郑奎3，徐中慧1，彭杨1

２０18年第9期

摘要

引用本文

摘要：利用Frattini试验法、石灰吸收法、电导率法和活性指数法研究了四种不同细度高炉渣超细粉的火山灰活性。结果表明，四种方法均可反映不同细度高炉渣超细粉火山灰活性的高低。其中石灰吸收法和电导率法存在一定缺陷，仅限实验室使用；Frattini试验法可以定量火山灰反应中氧化钙的消耗量；活性指数法则可直接体现水泥胶砂强度变化情况。可见，Frattini试验法和活性指数法可靠性较高，是评价高炉渣超细粉火山灰活性的重要手段。 Abstract: The blast furnace slag superfine powder with high pozzolanic activity is high quality cement admixture and concrete mineral additive. The pozzolanic activity of blast furnace slag superfine powder with different fineness is assessed by frattini test, lime consumption test, electrical conductivity test and strength activity index. The results show that all the four methods could characterize pozzolanic activity of blast furnace slag superfine powder. However, the lime consumption test and electrical conductivity test have the defects and are restricted in laboratory. The Frattini test could measure the amount of calcium hydroxide consumed in the pozzolanic reaction. The strength activity index method could directly reflect the change in the strength of cement mortar. Therefore, the Frattini test method and the strength activity index method have the higher reliability compared with lime consumption test and electrical conductivity test and are important for evaluating the pozzolanic activity of blast furnace slag superfine powder.

黄阳,黄艳,向香源,等.高炉渣超细粉火山灰活性评价方法研究[J].混凝土与水泥制品,2018(9):108-112. HUANG Y,HUANG Y,XIANG X Y,et al.Study on Assessment Method of Pozzolanic Activity of Blast Furnace Slag Superfine Powders[J].China Concrete and Cement Products,2018(9):108-112.

再生粗骨料及再生混凝土性能研究进展

甘福1，周脉席1，3，濮琦2

２０18年第9期

摘要

引用本文

摘要：结合国内外再生粗骨料混凝土的研究现状，综述了再生粗骨料性能、再生粗骨料混凝土性能、再生混凝土改性方法及改性后的混凝土性能等方面内容，展望了再生粗骨料及再生混凝土未来研究方向。 Abstract: Combining the study of recycled coarse aggregate concrete at home and abroad, the property of recycled coarse aggregate, the performance of recycled coarse aggregate concrete, the modified method of recycled concrete and the performance of modified concrete are reviewed, and the fature research direction on recycled coarse aggregate and recycled concrete is prospected.

甘福,周脉席,濮琦.再生粗骨料及再生混凝土性能研究进展[J].混凝土与水泥制品,2018(9):102-107. GAN F,ZHOU M X,PU Q.Research Progress of Performance of Recycled Coarse Aggregate and Recycled Concrete[J].China Concrete and Cement Products,2018(9):102-107.

矿渣碱激发胶凝材料固化盐渍土试验研究

田亮1,2，姚晓1，董洁2，戴硕2，诸华军2，杨涛2，吴其胜2

２０18年第9期

摘要

引用本文

摘要：为解决盐渍土路基铺设存在的溶陷、变形等问题，采用矿渣碱激发胶凝材料固化的方法对盐渍土的综合性能进行优化。通过击实试验和无侧限抗压强度试验研究了矿渣碱激发胶凝材料对盐渍土抗压强度的影响，并利用XRD和SEM分析了试样的物相组成和微观形貌。结果表明，矿渣碱激发胶凝材料固化盐渍土效果显著，掺入适量矿渣碱激发胶凝材料盐渍土的抗压强度和水稳定性显著改善，反应产物中C-S-H凝胶相含量明显增多，形成了结构稳定的胶凝-网状混合结构。水化反应生成了新的水化产物片状晶体和针棒状晶体，形成了C-S-H凝胶相和钙矾石的结构。 Abstract: To solve the problem of subsidence and deformation in the paving of saline soil roadbed, the solidification through alkali-activated slag is adopted to improve the engineering performance of the saline soil. The compaction test and unconfined compressive strength test are used to study the effects of alkali-activated slag on the compressive strength of saline soil, and the X-ray diffraction (XRD) and scanning electron microscope (SEM) are used to characterize the phase composition and microstructure of samples. The results show that the solidified roles of alkali-activated slag is remarkable. A moderate amount of alkali-activated slag can effectively improve the compressive strength and the water stability of saline soil. The morphology of the C-S-H gel phase and ettringite is assoiciated with the crystal plate and needle stick crystals, respectively.

田亮,姚晓,董洁,等.矿渣碱激发胶凝材料固化盐渍土试验研究[J].混凝土与水泥制品,2018(9):98-101. TIAN L,YAO X,DONG J,et al.Experimental Study on Solidification of Saline Soil Using Alkali-activated Slag Materials[J].China Concrete and Cement Products,2018(9):98-101.

桥墩大体积混凝土水化热试验研究及数值模拟

刘国星，黄永辉，万洋

２０18年第9期

摘要

引用本文

摘要：以广州某大桥节段模型试验为背景，在其桥墩浇筑过程中实测了内部水化热温度场的变化规律，并采用Midas软件对该桥墩混凝土浇筑过程中的水化热温度场进行了有限元仿真，通过仿真结果与实测结果的对比验证了有限元模型的正确性。通过有限元模拟研究了早强混凝土和普通混凝土的水化热温度场差异性以及普通混凝土相比于早强混凝土到达温度峰值时间滞后性的一般规律；并研究了设置冷管循环对大体积混凝土温度场的影响，结果表明，在早强混凝土中设置冷管循环能有效降低大体积混凝土的水化热温度。 Abstract: Based on the segmental model test of a long span bridge in Guangzhou, the change law of the internal hydration heat temperature field was measured during the casting of the bridge piers, the hydration heat of the concrete construction of the pier was also simulated by using the Midas software, and the comparison between the finite element results and the measured results verified the correctness of the finite element model. Further numerical simulations were conducted to study the differences in the temperature field of hydration heat of early-strength concrete and ordinary concrete, and the general law of the time lag effect corresponding the peak temperature of the ordinary concrete and the early-strength concrete. Additionally, the effect of pipe cooling circulation system on the hydration heat temperature field of the mass concrete was also studied. The results show that setting pipe cooling circulation system in early-strength concrete can effectively reduce the hydration temperature of the mass concrete.

刘国星,黄永辉,万洋.桥墩大体积混凝土水化热试验研究及数值模拟[J].混凝土与水泥制品,2018(9):94-97. LIU G X,HUANG Y H,WAN Y.Experimental Research and Numerical Simulation on Hydration Heat of Bridge Mass Concrete[J].China Concrete and Cement Products,2018(9):94-97.

合成纤维强力保留率与强度保留率对比分析

王天琪1，杨鼎宜1，2，吕锦飞1，周星宇1，葛晨1，韩雪1

２０18年第9期

摘要

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摘要：关于合成纤维的众多标准中，对纤维的耐碱测试结果一般以强力保留率为准，但强度保留率也是评价合成纤维的一个重要指标。为了对比分析强力保留率和强度保留率，选取了聚乙烯醇和聚丙烯两种合成纤维进行长期高温耐碱试验，测试不同浸泡时间后两种合成纤维的直径和力学性能，分别分析纤维溶胀性、强力和强度的变化。试验结果表明，碱溶液浸泡后合成纤维强力变化不明显，而直径随时间的延长逐渐增加，溶胀性能变大，强度逐渐减小，纤维的耐碱性能下降。因此，现行标准GB/T 21120—2007《水泥混凝土和砂浆用合成纤维》中用强力保留率表征合成纤维的耐碱性能存在不合理之处，标准中并没有考虑纤维直径的变化，而强度保留率却能随直径的变化而变化，相对而言，用强度保留率反映合成纤维的耐碱性能更加合理。 Abstract: In many standards for synthetic fibers, the alkali resistance test results for fibers are generally based on strong retention rate, but strength retention rate is also an important indicator for evaluating synthetic fibers. In order to compare the strong retention rate with the strength retention rate, the long-term high temperature and alkali resistance experiment of polyvinyl alcohol and polypropylene synthetic fibers are carried out to test the diameter and mechanical properties of the fibers after different soaking time. The results show that the strength change of the synthetic fibers after soaking in the alkaline solution was not obvious, but the diameter gradually increases with time, the swelling performance increases, and the strength and the alkali resistance of the fibers is decreased. Therefore, the current standard GB/T 21120—2007 "synthetic fibers for cement concrete and mortar" in the use of strong retention rate to characterize the alkali resistance of synthetic fibers is unreasonable, the standard does not consider the change in fiber diameter, but the strength retention rate can change with the change of diameter. Relatively speaking, it is more reasonable to reflect the alkali resistance of synthetic fiber by the strength retention rate.

王天琪,杨鼎宜,吕锦飞,等.合成纤维强力保留率与强度保留率对比分析[J].混凝土与水泥制品,2018(9):90-93. WANG T Q,YANG D Y,LYU J F,et al.Comparison Analysis on Strong Retention Rate and Strength Retention Rate of Synthetic Fiber[J].China Concrete and Cement Products,2018(9):90-93.

GB/T 22082—2017《预制混凝土衬砌管片》标准解读

俞锋1，王春蓉1，谈永泉2，黎峰3

２０18年第9期

摘要

引用本文

摘要：随着隧道工程建设的发展，预制混凝土衬砌管片已成为预制混凝土构件的重要产品。本文简要介绍了即将实施的GB/T 22082—2017《预制混凝土衬砌管片》的修订情况，并对标准条文的主要内容进行了简要说明。 Abstract: With the development of tunnel engineering construction, precast concrete lining segment has become an important product of precast concrete components. The upcoming revision of GB/T 22082—2017 Precast Concrete Lining Segments is briefly introduced and the main contents of the standard provisions are briefly explained.

俞锋,王春蓉,谈永泉,等.GB/T 22082—2017《预制混凝土衬砌管片》标准解读[J].混凝土与水泥制品,2018(9):85-89. YU F,WANG C R,TAN Y Q,et al.Standard Interpretation of GB/T 22082-2017 Precast Concrete Lining Segments[J].China Concrete and Cement Products,2018(9):85-89.

再生泡沫混凝土吸水率及干缩特性研究

刘德慧

２０18年第9期

摘要

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摘要：采用废旧混凝土经破碎、筛分而成的粒径小于2.36 mm的再生细骨料制备泡沫混凝土，通过单因素试验探究水灰比、减水剂掺量及聚丙烯纤维掺量对其吸水率与干缩特性的影响规律。结果表明，再生泡沫混凝土的吸水率随水灰比的增大而增大，随减水剂掺量的增大而显著减小，水灰比0.76与减水剂掺量0.3%对应的吸水率最小，纤维掺量并不显著影响吸水率特性；再生泡沫混凝土的干缩值随减水剂掺量、纤维掺量的增大而显著减小，减水剂掺量0.2%与纤维掺量0.2%对应的干缩值最小，水灰比并不显著影响干缩特性。 Abstract: The recycled fine aggregate with particle size less than 2.36 mm by crushing and sieving of waste concrete was used to prepare foamed concrete, and the influence of water cement ratio, water reducer dosage and polypropylene fiber content on water absorption and drying shrinkage characteristics was studied through single factor experiment. The results show that the water absorption of recycled foamed concrete increases with the increase of water cement ratio, decreases significantly with the increase of the amount of water reducing agent, the water absorption is the smallest when water cement ratio is 0.76 and the dosage of water reducer dosage is 0.3%, the fiber content does not significantly affect the water absorption property. The dry shrinkage value of the recycled foam concrete decreases significantly with the increase of water reducer dosage and fiber content, which is the smallest when the water reducer dosage is 0.2% and fiber content is 0.2%. The water cement ratio does not significantly affect the shrinkage characteristics.

刘德慧.再生泡沫混凝土吸水率及干缩特性研究[J].混凝土与水泥制品,2018(9):81-84. LIU D H.Study on Water Absorption and Drying Shrinkage Characteristics of Recycled Foam Concrete[J].China Concrete and Cement Products,2018(9):81-84.

基于双剪试验CFRP-混凝土界面黏结性能影响因素研究

孙家国1，2，谷艳玲1，2，尹秋雨1

２０18年第9期

摘要

引用本文

摘要：通过双面剪切试验设计了九组试验方案，以CFRP黏结长度、黏结宽度、黏贴层数三个因素为变量，根据CFRP应变、黏结应力的变化规律，研究了C30混凝土试件和碳纤维片材界面的黏结性能，以及在各级荷载作用下沿黏结长度的分布情况，分析了CFRP-混凝土界面的有效黏结长度。结果表明，随着CFRP黏结厚度、长度、宽度的增大，试件的极限荷载和应变均明显增加，但对初始剥离荷载和应变的影响不大；当继续增加荷载时，应力传递区域的长度不断加大，呈现动态变化趋势。 Abstract: According to the changing rule of the CFRP strain and bond stress, 9 groups of schemes were designed by taking CFRP bond length, bond width and paste layer as the variables through double-sided shear test to explore bond properties of the C30 concrete specimen and carbon fiber sheet interface. Meanwhile, the effective bond length of CFRP-concrete interface was analyzed by observing the distribution of the bond length under load at all levels. The results show that the ultimate load and strain of the specimen increase obviously with the increase of the thickness, length and width of CFRP, but it has little effect on the initial peeling load and strain. As the load continues to increase, the length of the stress transfer area also increases and shows a dynamic trend.

孙家国,谷艳玲,尹秋雨.基于双剪试验CFRP-混凝土界面黏结性能影响因素研究[J].混凝土与水泥制品,2018(9):77-80. SUN J G,GU Y L,YIN Q Y.Effecting Factors Research on Bond Properties of CFRP-concrete Based on Double Shear Test[J].China Concrete and Cement Products,2018(9):77-80.

侧墙结构混凝土早龄期开裂风险影响因素定量研究

李路1，李志全2，耿敏1，姚婷3，徐文3

２０18年第9期

摘要

引用本文

摘要：采用基于“水化-温度-湿度-约束”多场耦合机制的抗裂性评估理论与方法，结合城市轨道交通工程典型的主体结构形式，考虑材料、结构、施工等因素对城市轨道交通地下车站主体结构混凝土开裂风险的影响，系统研究了混凝土自身材料性能（强度等级、绝热温升、自生体积变形）、结构（长度、厚度）、施工工艺（浇筑季节、入模温度、模板类型、拆模时间）等因素对开裂风险的定量影响，明晰了各参数对侧墙结构混凝土开裂风险的影响规律，为抗裂性能控制指标的确定和类似工程侧墙结构混凝土早期抗裂提供指导。 Abstract: Combined with the typical main structural form of urban rail transit engineering, considering the effects of materials, structure, construction on the crack resistance of urban rail transit underground station, the quantitative influence of the material properties (strength grade, adiabatic temperature rise, autogenous volume deformation), structure(length, thickness), construction process(pouring season, casting temperature, template type, demolition time) of concrete on cracking risk were studied based on “hydration-temperature-humidity-constraination” multi-field coupling theory and method of crack resistance evaluation, the influence law of various parameters on concrete cracking risk of side wall structure was clarified, which could provide guidance for the determination of crack resistance performance control index and early crack resistance of similar engineering side wall structure concrete.

李路,李志全,耿敏,等.侧墙结构混凝土早龄期开裂风险影响因素定量研究[J].混凝土与水泥制品,2018(9):70-76. LI L,LI Z Q,GENG M,et al.Quantitative Study on the Influence Factors of Cracking Risk of Side Wall Concrete at Early Age[J].China Concrete and Cement Products,2018(9):70-76.

型钢混凝土叠合梁恢复力模型研究

梁松1，邵永健1，郭敬超1，薛祯钰1，王国佐2

２０18年第9期

摘要

引用本文

摘要：基于型钢混凝土叠合梁的抗震试验研究，对混凝土强度、浇筑类型及截面类型三个试验参数下6个试件的荷载-挠度滞回曲线展开分析。根据试验结果，运用数据拟合方法，建立型钢混凝土叠合梁的三折线骨架曲线模型，并给出了各段折线的方程表达式。对低周反复加载的各试件刚度退化规律进行线性回归，得到统一的加载和卸载刚度计算表达式，建立型钢混凝土叠合梁的恢复力模型。结果表明，通过所建议的恢复力模型计算得到的骨架曲线与试验得到的骨架曲线吻合度较好，说明该恢复力模型具有较好的适用性。 Abstract: Based on the aseismic test of prefabricated steel reinforced concrete beam, the load-deflection hysteresis curve of six specimens under three test parameters of concrete strength, casting type and section form are analyzed. According to the experimental results, the model of three-fold line skeleton curve of prefabricated steel reinforced concrete beam is established by means of data fitting method, and the equation expressions of the fold lines are given. Linear regression is performed for the stiffness degradation rules of the specimens with low cyclic loading, and the expressions of uniform loading and unloading stiffness are obtained, then the restoring force model of the prefabricated steel reinforced concrete beam is established. The results show that the skeleton curve obtained by the proposed recovery model is close to the test results, which indicates that the restoring force model is applicable.

梁松,邵永健,郭敬超,等.型钢混凝土叠合梁恢复力模型研究[J].混凝土与水泥制品,2018(9):65-69. LIANG S,SHAO Y J,GUO J C,et al.Model Research on Restoring Force of Prefabricated Steel Reinforced Concrete Beams[J].China Concrete and Cement Products,2018(9):65-69.

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