摘 要：研究了混凝土用再生粗骨料分类、加工方法，对比了再生粗骨料与天然粗骨料的各项性能。并基于研究现状，针对再生粗骨料存在的问题与不足，提出了建议。 Abstract: The classification and processing methods of recycled coarse aggregate are studied, and the properties of recycled coarse aggregate and natural coarse aggregate are compared. According to the current research situation, some suggestions are put forward to solving the problems and shortcomings of recycled coarse aggregate.

贺春鹏,付兴国,孙相博,等.混凝土用再生粗骨料性能研究[J].混凝土与水泥制品,2019(2):98-100. HE C P,FU X G,SUN X B,et al.Study on Recycled Coarse Aggregate for Concrete[J].China Concrete and Cement Products,2019(2):98-100.

摘 要：通过胶砂强度、水化热及扫描电镜（SEM），对纯水泥、掺粉煤灰、掺煤气化渣微粉三种胶凝体系的水化机理进行研究，结果表明：在同水胶比、同掺量的条件下，掺煤气化渣微粉组胶砂跳桌流动度较小，早期强度高于粉煤灰组，后期强度低于粉煤灰组；掺煤气化渣微粉组的水化热温度与放热速率要高于粉煤灰组；对三种胶凝体系水化产物的微观形貌分析发现纯水泥组与粉煤灰组的水化产物相似，而掺煤气化渣微粉组3 d水化产物生成了大量结晶度较低的纤维状水化硅酸钙凝胶，28 d水化产物由结晶度较低的纤维状水化硅酸钙凝胶转化为结晶度较高的类似于硬硅钙石的针状晶体，使得胶砂强度随之增强。 Abstract: Through cementing strength, hydration heat and scanning electron microscope (SEM), three kinds of cementitious cement, fly ash and micropowder of coal gasification slag are mixed. The hydration mechanism of the system is studied. The results show that with the same W/B and the same amount of mixing, the flow degree of the skip table with coal gasification slag powder group is slightly higher than that of the fly ash group. The early strength is higher than that of the fly ash group, and the later strength is lower than that of the fly ash group; the hydration heat temperature and exothermic rate of the coal gasification slag micro powder group are higher than that of the fly ash group. The microscopic morphology of the hydration products of the three cementing systems show that the hydration products of the pure cement group and the fly ash group are similar, a large amount of fibrous hydrated calcium silicate gel is produced by the 3 d hydrated product mixed with coal gasification slag. The hydration product of 28 d is converted from a low crystalline calcium silicate gel into a needle like crystal with a higher degree of crystallinity similar to stony calcareous stone which increases the strength of the mortar.

杭美艳,吕学涛,郭艳梅,等.煤气化渣微粉胶凝体系水化机理研究[J].混凝土与水泥制品,2019(2):94-97. HANG M Y,LYU X T,GUO Y M,et al.Research on Hydration Mechanism of Cementitious System of Coal Gasification Slag Micropowder[J].China Concrete and Cement Products,2019(2):94-97.

摘 要：选择机械球磨和化学激发剂双重激发方式，通过胶砂试验，研究了球磨时间、激发剂用量对再生微粉活性的影响，并通过测试活化后再生微粉对水泥胶砂抗压强度的影响来判断再生微粉的最优活化方式。试验结果表明，随着球磨时间的增长，再生微粉平均粒径减小，比表面积增大，有利于其活性的提高；扫描电镜和能谱分析结果表明，再生微粉主要由碳酸钙和二氧化硅组成，这为激发提供最根本可能性；抗压强度结果表明，Na2SO4激发效果更好，当激发剂掺量为3%，球磨时间在60 min以上时，可有效地提高再生微粉活性，增活后的再生微粉掺量可扩大至30%左右且能保证了胶砂试块的强度损失控制在15%以内。 Abstract: The effects of ball milling time and the amount of activator on the activity of the regenerated micro powder are mainly studied by the double excitation method of mechanical ball milling and chemical activator. The optimal activation mode of recycled fine powder is determined by the influence of activated micro powder on compressive strength of cement mortar. The results show that the average particle size of the regenerated powder increases with the increase of the milling time, and the specific surface area increases, which is beneficial to the increase of its activity. The scanning electron microscopy and energy spectrum results show that the regenerated powder is mainly composed of calcium carbonate and silica, which is the most fundamental possibility to improve the excitation. The results show that the Na2SO4 excitation effect is better. When the dosage of activator is 3% and the milling time is above 60 min, the activity of the regenerated micro powder could be improved effectively. After the activation, the content of recycled micro powder can be increased to about 30%, and the strength loss of colloidal sand test blocks com be controlled within 15%, which greatly improves the utilization rate of recycled micro powder.

张平,古龙龙,王琴,等.激发再生微粉活性的方法研究[J].混凝土与水泥制品,2019(2):90-93. ZHANG P,GU L L,WANG Q,et al.Study on the Method of Stimulating the Activity of Regenerated Micro Powder[J].China Concrete and Cement Products,2019(2):90-93.

摘 要：采用后浇带法实现超长大体积混凝土整体基础，可兼顾土建结构和上部电器设备设置要求，而混凝土后浇带临界浇筑长度取值是该方法的关键技术问题之一。本文采用ANSYS有限元软件建立超长大体积混凝土基础模型，分析了不同季节、入仓温度和地基约束工况下的后浇带合理浇筑长度。计算结果表明，浇筑长度对混凝土温度应力影响明显，而合理的浇筑长度选取应综合考虑入仓温度、季节和基础约束程度等因素。 Abstract: The post-casting method is used to pour the overall foundation of ultra-long mass concrete, which can take into account the requirements of civil engineering structure and upper electrical equipment. The value of critical pouring length of concrete post-casting belt is one of the key technical problems of this method. The ANSYS finite element software is used to establish the ultra-long mass concrete foundation model. The reasonable pouring length of the post-casting belt under different seasons, storage temperature and foundation is systematically analyzed. The results show that the casting length has obvious influence on the concrete temperature stress, and the reasonable pouring length selection should consider the factors such as the temperature, season and foundation constraint.

商文念,刘建秋,魏珍中,等.超长大体积混凝土整体基础后浇带临界浇筑长度研究[J].混凝土与水泥制品,2019(2):85-89. SHANG W N,Liu J Q,Wei Z Z,et al.Research on Critical Casting Length of Post-casting Belt of Ultra-long Mass Concrete Overall Foundation[J].China Concrete and Cement Products,2019(2):85-89.

肖军,王军,范琛.普硅发泡水泥的制备及配合比研究[J].混凝土与水泥制品,2019(2):80-84. XIAO J,WANG J,FAN C.Research on Preparation and Mix Proportion of Ordinary Portland Foam Cement[J].China Concrete and Cement Products,2019(2):80-84

摘 要：选用具有隐蜂窝多孔结构的玻璃轻石材料作为粗、细骨料取代普通混凝土中的砂和石制作自保温砌块，测试了砌块密度、导热系数等性能，并根据试验结果分析了水灰比、水泥用量、细骨料取代率对砌块力学性能、玻璃轻石粗骨料取代率对热工性能的影响。试验分析得到砌块的最佳配合比：水灰比0.42、水泥用量350 kg/m3、玻璃轻石细骨料取代率100%、玻璃轻石粗骨料取代率100%。所制备的自保温砌块干密度为1 596 kg/m3，导热系数为0.417 W/（m·K）。 Abstract: The glass pumice material with the hidden honeycomb porous structure is used as the fine and coarse aggregate to replace the sand and stone in the ordinary concrete to make the hidden honeycomb self-insulating block. Its density，thermal conductivity and compressive strength were tested． According to the test results, the effects of water-cement ratio, glass pumice coarse aggregate replacement rate, cement dosage and fine aggregate replacement rate on mechanical properties and thermal properties of the block were analyzed. The optimum mix ratio of the block is 0.42, the cement dosage is 350 kg/m3, the replacement rate of glass pumice fine aggregate is 100%, and the replacement ratio of glass pumice coarse aggregate is 100%. The prepared self-insulating block has a dry density of 1 596 kg/m3 and a thermal conductivity of 0.417 W/(m·K).

王瑞,邹昀,高传超,等.玻璃轻石混凝土热工性能试验研究[J].混凝土与水泥制品,2019(2):76-79. WANG R,Zou Y,Gao C C,et al.Experimental Research on Thermal Performance of Glass Pumice Concrete[J].China Concrete and Cement Products,2019(2):76-79.