摘 要：为综合评价水灰比对橡胶砂浆性能的调控特性，以橡胶等体积替代40%砂，研究不同水灰比对橡胶砂浆力学和收缩性能的影响。研究表明，随着水灰比的减小，橡胶砂浆各龄期的抗压、抗折强度均呈现逐渐提高的趋势；橡胶砂浆的早期收缩特性较为显著，且随着水灰比的减小，橡胶砂浆的自收缩及干缩幅度均呈逐渐提升的趋势。 Abstract: In order to comprehensively evaluate the control characteristics of W/C on the properties of rubber mortar, the effects of different W/C on the mechanical and shrinkage properties of rubber mortar were studied. Among them, rubber was replaced by 40% sand by equal volume. The results show that with the decrease of W/C, the compressive strength and flexural strength of rubber mortar at all ages increase gradually; the early shrinkage characteristics of rubber mortar are more significant, and with the decrease of W/C, the self-shrinkage and dry shrinkage of rubber mortar show a gradual increase trend.

吴帆,马海彬,任翔,等.水灰比调控橡胶砂浆力学及收缩性能试验研究[J].混凝土与水泥制品,2019(8):97-100. WU F,MA H B,REN X,et al.Experimental Research on Mechanical Properties and Shrinkage Performance of Rubber Mortar Controlled by W/C[J].China Concrete and Cement Products,2019(8):97-100.

摘 要：为了研究铁尾矿砂对高延性再生混凝土力学性能的影响，对12组108个再生粗骨料替代率为30%和50%的铁尾矿砂高延性再生混凝土进行试验研究，分析了不同铁尾矿砂掺量对再生混凝土抗压强度、劈裂抗拉强度和抗折强度的影响。结果表明，再生混凝土中掺入定量的PVA纤维后，再生粗骨料替代率为30%和50%的两种再生混凝土的力学性能随着铁尾矿砂掺量的增加均呈现先增长后下降的趋势，其抗压强度、劈裂抗拉强度及抗折强度基本呈正相关，并在铁尾矿砂掺量30%时达到峰值；当铁尾矿砂掺量相同时，再生骨料替代率越大其抗压强度越小；掺30%铁尾矿砂、再生骨料替代率30%的再生混凝土劈裂抗拉强度达到最大值；铁尾矿砂掺量30%时，再生骨料替代率30%和50%再生混凝土的抗折强度近似呈线性减小。 Abstract: In order to study the effect of iron tailings on the mechanical properties of high ductility recycled concrete, 108 recycled high ductility recycled concrete with 30% and 50% recycled coarse aggregate in 12 groups were tested and studied. The influence of different amount of iron tailings on compressive strength, splitting tensile strength and flexural strength of recycled concrete was analyzed. The results show that the mechanical properties of recycled concrete with recycled coarse aggregate replacement rate of 30% and 50% increase first and then decrease with the increase of iron tailings sand content. The compressive strength, splitting tensile strength and flexural strength of recycled concrete are positively correlated, and reach the peak at 30% iron tailings sand content. When the amount of recycled aggregate is equal, the greater the replacement rate of recycled aggregate, the smaller the compressive strength， and when the content of iron tailing sand is 30%, the splitting tensile strength of recycled concrete with 30% replacement ratio of recycled aggregate reaches the peak. When iron tailings sand content is 30%, the flexural strength of recycled concrete with recycled aggregate replacement rate of 30% and 50% decreases approximately linearly.

魏涛,全晓旖,闫强强,等.高延性铁尾矿砂再生混凝土力学性能试验研究[J].混凝土与水泥制品,2019(8):93-96. WEI T,QUAN X Y,YAN Q Q,et al.Experimental Study on Mechanical Performance of Ductile Iron Tailings RAC[J].China Concrete and Cement Products,2019(8):93-96.

摘 要：国内高速铁路32 m简支箱梁均采用整孔运输、架设施工，简支梁向更大跨度发展需解决梁重增加这一主要矛盾。超高性能混凝土（UHPC）材料是一种新型纤维增强水泥基复合材料，用其建造桥梁可以减小结构尺寸。为实现铁路大跨度简支梁整孔运架技术，对24 m UHPC简支箱梁的主要构造进行了设计计算，并结合24 m UHPC试验梁的制作提出了主要施工工艺要求。结果表明，高速铁路UHPC简支箱梁理论计算可行，可推广至更大跨度简支梁的建造实践；结合结构受力要求宜选用水胶比较高的UHPC材料；UHPC箱梁的模板应设计为内模可伸缩体系以适应材料收缩变形较大的特点。UHPC节段蒸养应严格按照升温、恒温、降温三个阶段蒸养。 Abstract: 32 m simply supported beam integrally prefabricated and erected for High-Speed railway is very popular. The main contradiction of increasing beam weight should be solved in the development of simply supported beams to larger span. Ultra-high Performance Concrete(UHPC) is a new fiber enhancement cement-based composite materials. The size of the structure can be more slender by using UHPC. In order to realize the whole-hole transportation and erection technology of railway long-span simple-supported beam, the main structure of 24 m UHPC simple-supported box girder is designed and calculated. Combined with the manufacture of 24 m UHPC test beam, the main construction technology requirements are put forward. The results show that the theoretical calculation of UHPC simple-supported box girder for high-speed railway is feasible and can be extended to the construction practice of large-span simple-supported girder; UHPC material with high water-cement ratio should be selected in combination with structural stress requirements; the formwork of UHPC box girder should be designed as an internal modular retractable system to adapt to the characteristics of material shrinkage and deformation. Steaming of UHPC segments should be strictly carried out in three stages: heating, constant temperature and cooling.

刘琛.高速铁路UHPC试验箱梁的设计与施工研究[J].混凝土与水泥制品,2019(8):89-92. LIU C.Design and Construction Research of UHPC Test Box Girders for Highspeed Railway[J].China Concrete and Cement Products,2019(8):89-92.（1）对高速铁路24 m UHPC简支试验箱梁的理论分析表明，其各项技术指标均满足规范要求，且梁重较轻，说明该材料可应用于更大跨度的铁路简支梁实际工程。 　　（2）UHPC材料的水胶比低、工作性较差，在满足结构受力要求的前提下，为提高UHPC材料的工作性，宜降低UHPC材料的强度，以提高箱形断面桥梁倒角位置的浇筑质量。 （3）UHPC箱梁的模板应设计为内模可伸缩体系，在蒸养期间对内模定位进行调整以适应UHPC材料收缩变形较大的特征。 　　（4）对UHPC箱梁节段进行蒸养时，应严格按照升温、恒温、降温三个阶段进行养护。升温速度不应大于12 ℃/h；降温速度不应大于15 ℃/h；恒温温度应控制在70 ℃±5 ℃，恒温养护时间为96 h。

摘 要：通过现场调研和重复试验比对，分析了北方某城市透水混凝土路面质量问题原因并提出了相应对策。结果表明，路基土质不良和垫层处理不当是引起该工程透水路面开裂、脱空的主要原因，雨季大量雨水对路基的冲刷以及窨井的约束作用进一步加剧了破坏的发生；经验证，透水混凝土原材料与配合比能够满足C30设计强度要求，但透水混凝土干燥收缩高于普通混凝土。解决水泥透水混凝土路面的质量问题需要从设计-材料-施工等多角度统筹考量，并在路基、垫层处理和接缝、井盖周边等薄弱环节加强施工，减少透水路面破坏的发生。 Abstract: Based on site investigation and reproducible experiments, The causes of the quality issues of permeable concrete pavement in a North-China city were analyzed and countermeasures were put forwoard. The results show that poor soil quality and improper treatment of cushion are the main causes of the cracking and void of permeable concrete pavement. During the rainy season, the erosion of the roadbed and the restraint of inspection wells further aggravate the damage. According to the experiment results, the raw material and mix ratio of permeable concrete can meet the design strength requirements of C30, but the dry shrinkage of permeable concrete is higher than that of ordinary concrete. In order to solve the quality issues of permeable concrete pavement, solving the quality issues of permeable concrete pavement needs to be considered from the perspectives of design, materials and construction.And strengthen the construction in the weak links such as subgrade, cushion treatment and joint, and around manhole covers to reduce the damage of the permeable concrete pavement.

姜骞.透水混凝土路面质量问题原因分析与防控对策[J].混凝土与水泥制品,2019(8):85-88. JIANG Q.Cause Analysis and Countermeasures for Quality Issues of Permeable Concrete Pavement[J].China Concrete and Cement Products,2019(8):85-88.

摘 要：以欧洲与日本的先进模具制造技术为基础，通过调查和比较国内外现有的模具结构和技术规格，基于解预制厂当前预制混凝土箱涵模具产品的使用情况，经过不断改进完善，研发了一款精度、稳定性及效率相对较好的预制混凝土箱涵模具。本文介绍了该款模具的主要结构特点，创新点及关键技术指标。 Abstract: Based on the advanced mould manufacturing technology in Europe and Japan, the existing mould structures and technical specifications at home and abroad were investigated and compared by the current use of prefabricated concrete box culvert mould products in prefabrication factories. Through continuous improvement and improvement, a high precision, high stability and high efficiency prefabricated concrete box culvert mould was developed. The main structure characteristics, innovation points and key technical indicators of the mould are introduced.

刘锦涛.预制混凝土箱涵模具研究与应用[J].混凝土与水泥制品,2019(8):83-84. LIU J T.Research and Application of Prefabricated Concrete Box Culvert Mould[J].China Concrete and Cement Products,2019(8):83-84.

摘 要：利用长英岩类石粉代替粉煤灰制备蒸压加气混凝土，研究了蒸压养护温度和铝粉掺量对加气混凝土强度、干表观密度及吸水性等性能的影响。试验结果表明，当铝粉为最佳掺量时，试块强度达到3.6 MPa，干表观密度为620 kg/m3，符合蒸压加气混凝土B06级要求，完全可以用长英岩类石粉代替粉煤灰生产蒸压加气混凝土。在蒸压养护过程中，长英岩中石英和长石均不同程度地参与了水热反应。 Abstract: Autoclaved aerated concrete samples were prepared with felsite powder instead of fly ash. The effects of autoclaved curing temperature and aluminum powder dosage on the strength, dry apparent density and water absorption of aerated concrete were studied. The results show that when aluminum powder doses in optimal value, the strength reaches 3.6 MPa, and the dry apparent density is 620 kg/m3. The properties can meet the requirement of standard for autoclaved aerated concrete product grade B06. Felsite powder can be completely substituted for fly ash in production of autoclaved aerated concrete. In autoclaved curing, both quartz and feldspar inside felsite powder take part in hydrothermal reaction to some extent.

王贺月,蔡基伟,赵慧,等.长英岩蒸压加气混凝土的主要性能研究[J].混凝土与水泥制品,2019(8):80-82. WANG H Y,CAI J W,ZHAO H,et al.Study on Properties of Autoclaved Aerated Concrete with Felsite[J].China Concrete and Cement Products,2019(8):80-82.