摘 要： 研究了实验室破碎废弃混凝土过程中产生的再生微粉的性能，并将再生微粉以不同比例掺入水泥净浆、砂浆及混凝土中，研究其影响规律。结果表明，再生微粉具有潜在活性，可以替代水泥胶凝材料；随着再生微粉取代率的增加，水泥净浆标准稠度用水量增加、凝结时间延迟，水泥胶砂流动度减小；当再生微粉取代率大于20%时，砂浆强度降低明显；当再生微粉取代率为20%时，混凝土各龄期强度均为最高，其28 d抗压强度达到48.16 MPa；随着水化龄期的增加，各取代率下的强度比差异越来越小，再生微粉混凝土后期强度增长较快。 Abstract: The properties of the recycled fine powder(RFP) produced in the process of crushing waste concrete in the laboratory were studied, and the RFP was mixed into cement paste, mortar and concrete in different proportions to investigate its influencement. The results show that the RFP has potential activity and can replace cementitious materials. With the increase of the replacement rate of RFP, the water consumption of cement paste standard consistency increases and the setting time of cement paste is delayed, and the fluidity of cement mortar decreases. The strength of mortar decreases when the replacement rate of RFP exceeds 20%. When the replacement rate of RFP is 20%, the strength of concrete at each age is the highest, and the 28 d compressive strength of concrete reaches 48.16 MPa. With the increase of hydration age, the strength ratio under each substitution rate is getting smaller and smaller, and the strength of concrete at late age grows faster.

陈曦,李滢,庄平英.废弃混凝土再生微粉胶凝性能的试验研究[J].混凝土与水泥制品,2019(11):96-100. CHEN X,LI Y,ZHUANG P Y.Experimental Study on Cementitious Properties of Recycled Fine Powder from Waste Concrete[J].China Concrete and Cement Products,2019(11):96-100.

摘 要：基于正交分析法研究了不同因素对粒化高炉矿渣代砂高性能水泥基材料力学性能的影响。通过分析水胶比、代砂率和养护制度三种因素对高性能水泥基材料力学性能的影响，确定了不同因素对抗压强度影响的主次顺序以及各因素的最优水平组。结果表明，不同因素对抗压强度影响的主次顺序均为：养护条件＞水胶比＞代砂率；对抗折强度影响的主次顺序为：代砂率＞水胶比＞养护条件；抗压强度随着水胶比的增大而降低，随着代砂率的增大而呈现出先增大后减小的趋势，而抗折强度随着水胶比与代砂率的增大均呈下降趋势；相比于标准养护，蒸压与低压蒸汽养护均能提高粒化高炉矿渣代砂高性能水泥基材料的抗压强度，且蒸压养护＞低压蒸汽养护＞标准养护；显微测试结果表明，采用粒化高炉矿渣代替细骨料能够有效提高水泥基材料的抗压强度。 Abstract: Based on the orthogonal analysis method, the effects of different factors on the mechanical properties of high performance cement-based materials containing granulated blast furnace slag (GBFS) as fine aggregate were studied. By analyzing the effects of water-binder ratio, sand replacement ratio and curing schedule on the mechanical properties of high performance cement-based materials, the important order of the influence of different factors on the compressive strength and the optimal level of each factor were determined. The results show that the important order of different factors on the compressive strength is: curing schedule > water- binder ratio > sand replacement ratio. The important order of different factors on the flexural strength is: sand replacement ratio > water-binder ratio > curing schedule. The compressive strength decreases with the increase of water-binder ratio, the compressive strength increases first and then decreases with the increase of sand replacement ratio, the flexural strength decreases with the increase of water-to-binder ratio and sand replacement ratio. Both autoclave and steam curing can improve the compressive strength of GBFS high performance cement-based materials for sand replancement, and autoclave curing > low pressure steam curing > standard curing. Microscopic test results show that using granulated blast furnace slag instead of fine aggregate can effectively improve the compressive strength of cement-based materials.

石东升,李科,薛欣欣,等.粒化高炉矿渣代砂高性能水泥基材料力学性能正交试验[J].混凝土与水泥制品,2019(11):92-95. SHI D S,LI K,XUE X X,et al.Mechanical Properties of High Performance Cement-based Materials for Granulated Blast Furnace Slag Based on Orthogonal Test[J].China Concrete and Cement Products,2019(11):92-95.

摘 要：路桥过渡段用泡沫混凝土代替传统的填料进行浇筑，为缓解桥头跳车问题提供了一种新的途径。本文进行正交设计试验，对泡沫混凝土的抗压强度、吸水率和流动度等指标进行了分析研究；通过验证试验确定了最终的推荐最佳组合，并提出了标准化施工工艺流程与相应的施工要求。 Abstract: Traditional filler is replaced by foam concrete between the abutment and the subgrade, which can alleviate bump at approaches to the bridge. The orthogonal test is carried out to analyze the compressive strength, water absorption rate and fluidity of foam concrete. The best recommended combination is determined by verification test, and the standardized construction process and corresponding construction requirements are proposed.

吴颖峰.基于泡沫混凝土技术的桥头跳车处治研究[J].混凝土与水泥制品,2019(11):85-88. WU Y F.Research on Treatment of Bump at Approaches to the Bridge Based on Foam Concrete Technique[J].China Concrete and Cement Products,2019(11):85-88.

摘 要：以中美两国砌体结构技术标准为研究对象，从标准体系、逻辑结构和具体条款等方面出发，对比了中国GB 50003—2011《砌体结构设计规范》和美国ACI530—2011《砌体结构规范》的异同，阐述了两者的特点及差异，分析了各自的细致程度及对工期、造价等的影响，分析结论可为国际工程顺利开展提供技术支持和履约保障。 Abstract: The technical standards of masonry structure between China and the United States was compared. From the aspects of standard system, logical structure and specific terms, the Chinese National Standard GB 50003—2011"Code for design of masonry structures" and the American Concrete Association standard ACI 530—2011"Building Code Requirements and Specification for Masonry Structures". Specifically, the characteristics and differences of the standards were showed and their impact on construction period, cost, etc were analyzed. The results can provide assistance for two development of international projects and provide guarantee for strengthening the performance capability.

方坤,姚国友,杨林丽,等.中美砌体结构技术标准对比研究[J].混凝土与水泥制品,2019(11):82-84. FANG K,YAO G Y,YANG L L,et al.Comparative Study on the Technical Standards of Masonry Structures between China and the United States[J].China Concrete and Cement Products,2019(11):82-84.

摘 要：JG/T 408—2013《钢筋连接用套筒灌浆料》标准修订对套筒灌浆料的技术性能试验研究以及灌浆施工时不同环境温度类别（低温、常温）提出了新的要求，并结合工程应用，对材料要求、试验要求等章节进行了修改完善，以更好地保证套筒灌浆连接施工质量。本文对该标准主要修订内容和相关试验研究进行了介绍。 Abstract：The revision of JG/T 408—2013 Cementitious Grout for Sleeve of Rebar Splicing has put forward new requirements for the technical performance test and research of sleeve grouting material and different environmental temperature categories (low temperature and normal temperature) during grouting construction. Combined with the engineering application, the material requirements, test requirements and other chapters are modified and improved to better ensure the construction quality of sleeve grouting connection. Here, the main revisions of the standard and related experimental research are introducesd.

蒋勤俭,吴焕娟,钱冠龙,等.JG/T 408—2013《钢筋连接用套筒灌浆料》修订及专项试验研究介绍[J].混凝土与水泥制品,2019(11):78-81. JIANG Q J,WU H J,QIAN G L,et al.Revision Introduction of JG/T 408 — 2013 Cementitious Grout for Sleeve of Rebar Splicing and Special Test Research[J].China Concrete and Cement Products,2019(11):78-81.

摘 要：高性能修补砂浆能够较好地弥补由环境侵蚀引起的混凝土结构表面破坏、保护层脱落及钢筋外露等缺陷。为研制高性能修补砂浆，首先加入甲酸钙和乙酸钙两种早强剂来提高普通硅酸盐水泥砂浆的早期抗折强度和抗压强度，并探究了聚合物掺量对其黏结强度的影响。结果表明，两种早强剂的最佳掺量分别为1%和0.5%，聚合物的最佳掺量为10%。 Abstract: Defects such as surface damage of concrete structures, peeling off of protective layers and exposed steel bars caused by environmental erosion can be well compensated by high performance repair mortar. In order to develop high performance repair mortar, two early strength agents of calcium formate and calcium acetate were first added to improve the early flexural strength and compressive strength of ordinary Portland cement mortar, and the effect of polymer content on its bond strength was explored. The results show that the optimum dosage of the two early strength agents is 1% and 0.5% respectively, and the optimum dosage of the polymer is 10%.

马建斌.早强剂对修补砂浆力学性能和黏结性能的影响研究[J].混凝土与水泥制品,2019(11):74-77. MA J B.Effect of Early Strength Agent on Mechanical Properties and Bonding Properties of Repairing Mortar[J].China Concrete and Cement Products,2019(11):74-77.