摘 要：研究了不同来源重金属元素在混凝土中的浸出性，从胶凝材料、骨料和外加重金属元素三方面阐述重金属元素的浸出性。结果表明，纯水泥、水泥与粉煤灰质量比为7∶3、水泥与矿粉量比为7∶3三种胶凝体系中的重金属浸出率低，其中，纯水泥浆体中检测不到重金属离子的浸出；所选四个地区的天然粗骨料和六个地区的天然细骨料中的重金属含量和重金属浸出性各有差异，其中Pb和Zn相对含量及浸出率较高；而骨料中重金属的浸出率极低，Zn的相对浸出率较高；水泥净浆中外掺六种可溶性重金属盐或重金属氧化物表现出不同的重金属浸出性，外掺重金属氧化物，净浆的重金属浸出率较低，而外掺可溶性重金属盐，水泥净浆的重金属浸出率相对较高。 Abstract: The leachability of heavy metal elements in different sources of concrete including cementitious materials, aggregates and adding soluble heavy metal salts or heavy metal oxides was investigated. The results showed that the pastes of pure cement, 70% cement + 30% fly ash and 70% cement + 30% slag have low heavy metal elements leachability and pure cement pastes have no heavy metals extraction content; coarse aggregates obtained from four districts and fine aggregate obtained from six districts have different heavy metal elements content and different leachability; heavy metals leachability of cement pastes was increased when adding soluble heavy metal salts into cement pastes compared with adding heavy metal oxides.

韩彩霞,崔素萍,刘辉,等.不同来源重金属元素在混凝土中的浸出性研究[J].混凝土与水泥制品,2017(6):91-94. HAN C X, CUI S P, LIU H,et al.Study on Leachability of Heavy Metal Elements in Different Sources in Concrete[J].China Concrete and Cement Products,2017(6):91-94.

摘 要：将矿粉、粉煤灰、垃圾焚烧飞灰、垃圾焚烧底渣以单掺或1:1二元复掺替代部分水泥后，配制掺合料混凝土，测定其力学强度和拉压比，并利用平板法研究比较各掺合料混凝土的早期抗开裂性能。研究表明，粉煤灰具有适当降低混凝土的脆性和抑制早期开裂的性能，而矿粉的作用与其相反；飞灰对混凝土的早期开裂性能极为不利，在飞灰中复合部分粉煤灰或矿粉，可大大改善混凝土的早期抗裂性能；底渣混凝土因强度太低早期未出现明显的开裂，但在底渣中引入部分矿粉或粉煤灰后，混凝土的抗压强度能比单掺底渣混凝土明显提高，同时该底渣基复合掺合料混凝土的抗裂性能优异。 Abstract：Admixture concrete was prepared with slag, fly ash, waste incineration fly ash and waste incineration bottom ash replacing parts of cement singly or mixed both with the rate of 1:1. Mechanical strength and tension strength/compressive strength of corresponding concrete were tested. Plate method was used to study the early cracking resistance of every admixture concrete. The results showed that fly ash can appropriately reduce the brittle and restrain the early cracking of concrete, but slag plays an opposite function. The effect of waste incineration fly ash on early cracking of admixture concrete may be extremely unfavorable. Parts of fly ash or slag mixed into waste incineration fly ash can improve the early cracking resistance of corresponding concrete greatly. Because of poor strength of waste incineration bottom ash concrete, no obvious cracking phenomenon appear. But when parts of fly ash or slag were mixed into waste incineration bottom ash, compressive strength of corresponding concrete was significantly improved and its early cracking resistance was excellent, comparing with that of waste incineration bottom ash.

宋旭艳,孙保金,韩静云,等.几种矿物掺合料对混凝土脆性及早期开裂性能影响比较[J].混凝土与水泥制品,2017(6):86-90. SONG X Y, SUN B J, HAN J Y,et al.Comparison of Effects of Several Kinds of Mineral Admixtures on Brittleness and Early-age Cracking Performance of Concrete[J].China Concrete and Cement Products,2017(6):86-90.

摘 要：以南京地铁十四号线工程盾构施工为依托，借助ANSYS有限元软件，针对该工程中的翠屏山隧道建立了三维数模进行仿真计算与分析。计算结果表明，地铁隧道盾构施工对翠屏山隧道周围土体扰动较小，后者整体保持稳定，未出现大的异变；最大应变区域发生在翠屏山隧道中心区域，隧道底板最大下沉量为18.2mm，建议在该区域加密抗拔桩，以减小土体变形。 Abstract: Based on the shield construction of Nanjing Metro Line No.14, ANSYS finite element software is used to establish the 3D model of Cuipingshan Tunnel for simulation calculation and analysis. The results show that the subway shield tunnel construction has little influence on the surrounding soil of Cuipingshan Tunnel, the surrounding soil can maintain the overall stability and has no major changes. The maximum strain occurred in the center area of Cuipingshan Tunnel floor area, the maximum subsidence quantity is 18.2mm, which indicates that the uplift pile should be increased density to reduce soil deformation.

王军.盾构法施工对隧道稳定性的仿真分析[J].混凝土与水泥制品,2017(6):82-85. WANG J.Simulation Calculation Analysis of Shield Construction on Stability of Subway[J].China Concrete and Cement Products,2017(6):82-85.

摘 要：依托湖北某客运专线涵路过渡段采用袖阀管注浆加固法治理路基沉降工程，开展了袖阀管注浆用套壳料配合比室内试验研究，依据试验结果分析了套壳料各掺料对套壳料强度及其拌合物初凝、终凝时间的影响规律；结合工程特点，确定了该客运专线病害治理中袖阀管注浆加固用套壳料的合理配比，现场应用效果表明该配比较为合适，研究成果可为运营高铁路基沉降病害治理提供借鉴。 Abstract: Based on the test of the compaction ratio of the casing and the grouting material of the sleeve valve tube, the influence of the shell material on the transition section of a passenger line of Wuhan Passenger Dedicated Line was analyzed by the sleeve valve pipe grouting reinforcement method. Based on the characteristics of the project, the reasonable proportion of the shell material for the grouting pipe reinforcement was determined. The effect indicates that the ratio is appropriate. The results provide a reference for the management of the settlement of high-speed railway subsidence.

王生,郭佳奇,刘彦清,等.袖阀管注浆用套壳料配合比试验研究及工程应用[J].混凝土与水泥制品,2017(6):76-81. WANG S, GUO J Q, LIU Y Q,et al.Experimental Research and Engineering Application on Mix Proportion of Sleeve Valve Grouting Used by Casing Materials[J].China Concrete and Cement Products,2017(6):76-81.

摘 要：为改进可溶性SiO2法测定掺加粉煤灰的硬化砂浆中水泥含量，成型了不同粉煤灰掺量的砂浆试样。基于温度对硬化砂浆结构和溶解度的影响以及粒径对测定结果干扰程度的分析，优化了测定掺加粉煤灰的硬化砂浆中水泥含量的可溶性SiO2法，采用该测定方法后，硬化粉煤灰砂浆中水泥含量的相对误差绝对值可控制在5%以内，并且该方法能为掺加粉煤灰的硬化混凝土中水泥含量的测定提供参考。 Abstract: In order to improve the soluble silica method that measuring the real value of cement content in hardened fly ash mortars, different samples with varied content of fly ash were prepared. Based on the effect of temperature on structure and solubility of hardened mortars, the analysis about interference degree of hardened mortars’ particle size to measuring result, the method was optimized. By using this optimized method, the absolute value about relative deviation of cement content of hardened fly ash mortars was set within 5%. And this optimized method can give some help to the measuring of cement content in hardened fly ash concretes.

张亚涛,刘长顺,朱田生,等.用可溶性SiO2法测定掺加粉煤灰硬化砂浆中水泥含量的研究[J].混凝土与水泥制品,2017(6):72-75. ZHANG Y T, LIU C S, ZHU T S,et al.Study on Measuring Cement Content in Hardened Fly Ash Mortars with Soluble Silica Method[J].China Concrete and Cement Products,2017(6):72-75.

摘 要：介绍了预应力混凝土水泥制品中的高强度钢筋在张拉前进行的镦头工作。考虑到实际应用中早期的液压型钢筋镦头器通过碟型弹簧的压力进行钢筋的夹紧存在一定的缺陷和采用内外油缸并联的方式易产生误动作，提出了改进方案并予以实施。实践证明，改进后的钢筋墩头器有很好的应用效果。 Abstract: The pier head work that the tension of high strength steel in the pre-stressed concrete cement products is introduced. Considering the insufficient of the practical application of hydraulic clamping and the misoperation during the production, the improvement scheme and implementation is put forward. Practice has proved that the improved reinforced pier head has a good application effect.

张会强.钢筋镦头器的改进分析[J].混凝土与水泥制品,2017(6):70-71. ZHANG H Q.Improvement Analysis on Reinforced Pier Head[J].China Concrete and Cement Products,2017(6):70-71.