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.

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.

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.

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.

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.

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.