摘 要：锂渣及再生粗骨料对混凝土抗压强度有一定的影响，通过轴心抗压试验获得了立方体与棱柱体抗压强度之间的线性关系。结果表明，适量的再生粗骨料和锂渣可以有效提高混凝土28d抗压强度，当再生粗骨料取代率为30%，锂渣掺量为20%时，28d的立方体和棱柱体抗压强度最大，较同龄期下未掺锂渣的普通混凝土增长了39.1%和48.2%。 Abstract: Lithium slag and recycled coarse aggregates have a certain influence on the compressive strength of concrete, through the axial compressive test, the linear relationship of compressive strength between the cube and prism were obtained. The results show that the right amount of recycled coarse aggregate and lithium slag can effectively improve the 28d compressive strength. When the replacement rate of recycled coarse aggregate is 30% and the lithium slag content is 20%, the 28d compressive strength of cube and prism is the largest, is increased by 39.1% and 48.2% than the compressive strength of the ordinary concrete which is not added by lithium slag in the same age period.

摘 要：建筑垃圾再生微粉各项性能的研究是推进建筑垃圾资源化的重要基础。根据近年来国内关于再生微粉的主要研究成果，对材料来源、制备工艺、工作性能、力学性能和耐久性能等方面进行了综述，并对相关的影响因素进行了探讨分析。 Abstract: Research on the properties of utilization regeneration of powder for construction waste is the important foundation of resource utilization of construction waste. Based on the recent domestic research on recycled powder, material source, manufacturing process, workability, mechanical properties and the durability are reviewed. Besides, the related influence factors are discussed and analyzed

摘 要：结合实际工程，模拟道面混凝土散热特点，研究了不同防冻剂掺量、保温措施、入模温度、环境温度对混凝土强度的影响规律。研究结果表明，随着环境温度的降低，混凝土强度降低，亚硝酸钠掺量低于2%不影响混凝土强度，超过4%则对混凝土强度造成一定损失。采用塑料海绵配合电热毯对试件进行保温加热、提高入模温度可以有效地提高混凝土强度。多元回归分析结果表明，保温措施对强度的影响最大。 Abstract: Combination with actual engineering, the effecting rules of different antifreeze agent dosage, heat preservation measures, molding temperature, environment temperature on concrete strength are investigated through simulating the heat dissipation characteristics of pavement concrete. The results show that the concrete strength reduces with the decreasing of temperature, sodium nitrite content less than 2% will not affect the strength of concrete, while sodium nitrite dosage more than 4% will cause a certain loss of concrete strength. The concrete strength can be enhanced by adopting plastic sponge and electric blanket for heat preservation or increasing molding temperature. The result of multiple regression analysis indicate that heat preservation measures is the biggest influence on strength.

摘 要：为了消除管桩施工过程中超静孔隙水压对地基土层产生的不利影响，依托PHC管桩与塑料排水板处理某公路软土地基工程项目，进行了管桩挤土效应试验研究。在施工现场布置排水板间距分别为1.2m与2.4m的两个试验区，通过对管桩施工过程中孔隙水压力、土体侧向位移和地表沉降与隆起的对比测试，得到了不同排水板间距对抵消管桩挤土效应的效果。 Abstract: In order to eliminate the adverse effects of super pore pressure on the foundation soil in tubular pile construction process, the experiment research on squeezing effects of pipe pile is studied by PHC pipe pile and plastic drainage plate treatment in highway soft soil ground engineering project. Two test areas are arranged in construction site layout with 1.2meter drainage plate spacing and 2.4meter drainage plate spacing. Through the contrast tests on the pore water pressure, lateral displacement of soil and surface subsidence and uplift during pipe pile construction, influence of different drainage plate spacing on offsetting squeezing effects of pipe pile is carried out.

摘 要：结合相关施工规范要求和复合墙板的构造特点，对墙板吊装方式、吊装施工进行研究，并通过工程算例校核复合墙板吊装的安全性。结果表明，密肋复合墙板、女儿墙、叠合板在脱模起吊、运输起吊时宜采用四点平吊，安装起吊时宜采用两点直吊；吊点宜对称布置在肋梁与肋柱交汇处。 Abstract: Combination with related construction specifications and structure features of composite wall, the wallboard lifting method, checking computation of lifting construction are studied and the safety of the composite wallboard hoisting for engineering calculation is passed. The results show that multi-ribbed composite wall, parapet and laminated board are used a four-point level lifting in stripping lifting and transportation lifting, while the multi-ribbed composite wall, parapet and laminated board are used two straight in installing lifting cranes; lifting points should be arranged symmetrically in the ribs and rib beams column interchange.

摘 要： 介绍了GB 50838—2015《城市综合管廊工程技术规范》修订情况，按照国家产业政策导向的要求，强调了预制拼装综合管廊的工程示范意义。 Abstract: The revision note for national standard GB 50838—2015 Technical code for urban utility tunnel engineering is systematically introduced. And in accordance with the requirements of the national construction industry policy oriented, precast utility tunnel is emphasized in engineering demonstration application.