利用电石渣对磷石膏进行改性，得到了改性磷石膏，将改性磷石膏、水泥、矿渣粉按一定比例混合，采用造粒成球工艺制成改性磷石膏轻骨料，研究了改性磷石膏掺量和养护龄期对改性磷石膏轻骨料性能的影响，分析了改性磷石膏轻骨料替代部分碎石在磷石膏基路基材料中应用的可行性。结果表明：随着改性磷石膏掺量的增加，改性磷石膏轻骨料的筒压强度和软化系数降低，吸水率增大；当改性磷石膏掺量为88%、养护龄期为60 d时，改性磷石膏轻骨料的筒压强度为5.8 MPa、吸水率为9.8%、软化系数为0.75，符合GB/T 17431.1—2010《轻集料及其试验方法 第1部分：轻集料》的要求。研制的改性磷石膏轻骨料已成功应用于道路工程中。 The modified phosphogypsum was obtained by modifying phosphogypsum with carbide slag. The modified phosphogypsum, cement, and slag powder were mixed in a certain proportion, and the modified phosphogypsum lightweight aggregate was made by the granulation process. The effects of modified phosphogypsum content and curing age on the properties of modified phosphogypsum lightweight aggregate were studied, and the feasibility of using modified phosphogypsum lightweight aggregate to replace part of crushed stone in phosphogypsum-based subgrade materials was analyzed. The results show that with the increase of modified phosphogypsum content, the cylinder compressive strength and softening coefficient of modified phosphogypsum lightweight aggregate decrease, and the water absorption rate increases. When the content of modified phosphogypsum is 88% and the curing age is 60 d, the cylinder compressive strength of modified phosphogypsum lightweight aggregate is 5.8 MPa, the water absorption rate is 9.8%, and the softening coefficient is 0.75, which meets the requirements of GB/T 17431.1—2010 Lightweight Aggregates and Its Test Methods—Part 1: Lightweight Aggregates. The developed modified phosphogypsum light aggregate has been successfully used in road engineering.

吕伟,吴赤球,龚文辉,等.改性磷石膏轻骨料在路基材料中的应用研究[J].混凝土与水泥制品,2022(6):82-86. LYU W,WU C Q,GONG W H,et al.Research on the Application of Modified Phosphogypsum Lightweight Aggregate in Subgrade Materials[J].China Concrete and Cement Products,2022(6):82-86.

研究了凝灰岩粉的掺量和比表面积对水工混凝土耐久性能（抗渗性能、抗冻性能、抗硫酸盐侵蚀性能）的影响，并通过压汞法从微观层面对掺凝灰岩粉水工混凝土的孔结构进行了分析。结果表明：当凝灰岩粉的比表面积为352 m2/kg，且掺量控制在30%以下时，有利于改善水工混凝土的抗渗性能和抗硫酸盐侵蚀性能；凝灰岩粉的比表面积越大，对水工混凝土中小孔的填充作用越好，但对大孔的填充作用不明显。 The effects of the content and specific surface area of tuff powder on the durability(impermeability, frost resistance and sulfate corrosion resistance) of hydraulic concrete were studied, and the pore structure of hydraulic concrete mixed with tuff powder was analyzed from the micro level by mercury injection method. The results show that when the specific surface area of tuff powder is 352 m2/kg and the content of tuff powder is controlled below 30%, it is beneficial to improve the impermeability and sulfate corrosion resistance of hydraulic concrete. The larger the specific surface area of tuff powder, the better the filling effect of small pores in hydraulic concrete, but the filling effect of large pores is not obvious.  

张平,马旭东,刘洋,等.凝灰岩粉对水工混凝土耐久性能的影响研究[J].混凝土与水泥制品,2022(6):87-90,104. ZHANG P,MA X D,LIU Y,et al.Study on the Influence of Tuff Powder on the Durability of Hydraulic Concrete[J].China Concrete and Cement Products,2022(6):87-90,104.

研究了镍铁渣粉掺量对镍铁渣粉-水泥复合胶凝材料标准稠度用水量、凝结时间的影响，分析了镍铁渣粉-水泥胶砂试件的抗压强度、抗折强度，探讨了镍铁渣粉-硅灰-水泥胶砂试件的力学性能。结果表明：镍铁渣粉-水泥复合胶凝材料的标准稠度用水量、凝结时间均与镍铁渣粉掺量呈正相关，而镍铁渣粉-水泥胶砂试件的抗压强度、抗折强度均与镍铁渣粉掺量呈负相关，且镍铁渣粉的掺量不宜大于30%；硅灰能有效改善镍铁渣粉-硅灰-水泥胶砂试件的内部结构，提高其强度，且镍铁渣粉与硅灰的总掺量不宜大于30%，镍铁渣粉和硅灰的质量比不宜小于1。 The effects of the ferronickel slag powder content on the standard consistency water consumption and setting time of ferronickel slag powder-cement composite cementitious material were studied. The compressive strength and flexural strength of ferronickel slag powder-cement mortar specimens were analyzed, and the mechanical properties of ferronickel slag powder-silica fume-cement mortar specimens were discussed. The results show that the standard consistency water consumption and setting time of ferronickel slag powder-cement composite cementitious material are positively correlated with the ferronickel slag powder content, while the compressive strength and flexural strength of ferronickel slag powder-cement mortar specimens are negatively correlated with the ferronickel slag powder content, and the ferronickel slag powder content should not be greater than 30%. Silica fume can effectively improve the internal structure and strength of ferronickel slag powder-silica fume-cement mortar specimen, and the total content of ferronickel slag powder and silica fume should not be greater than 30%, and the mass ratio of ferronickel slag powder to silica fume should not be less than 1.

罗才松,陈华艳,刘旭宏,等.镍铁渣粉对水泥基复合材料性能的影响研究[J].混凝土与水泥制品,2022(6):91-95. LUO C S,CHEN H Y,LIU X H,et al.Influence of Ferronickel Slag Powder on Properties of Cement-based Composites[J].China Concrete and Cement Products,2022(6):2022(6):91-95.

于琦,张思雨,李长江,等.牡蛎壳粉对再生骨料透水混凝土性能的影响[J].混凝土与水泥制品,2022(6):96-98. YU Q,ZHANG S Y,LI C J,et al.Effect of Oyster Shell Powder on Properties of Recycled Aggregate Pervious Concrete[J].China Concrete and Cement Products,2022(6):2022(6):96-98.

陈坤,李育彪,柯春云,等.抹面砂浆原材料与应用研究进展[J].混凝土与水泥制品,2022(6):99-104. CHEN K,LI Y B,KE C Y,et al.Progress on Raw Materials and Application of Rendering Mortar[J].China Concrete and Cement Products,2022(6):2022(6):99-104.

为探究混凝土箱梁在分层浇筑施工过程中水化热温度的发展规律及其温度应力，对某主跨230 m的大跨度预应力混凝土箱梁桥零号块水化热进行了连续观测，并基于观测结果和有限元数值模拟计算，分析了零号块水化过程中底板、腹板和横隔板的温度应力发展规律；同时，讨论了分层浇筑和整体浇筑两种不同施工方案对零号块水化热温度应力分布的影响，研究了拆模时间对结构内外温度的影响程度。结果表明：内外温差在结构内部产生的温度应力超过了材料的抗拉强度，从而导致了温度裂缝的产生；采用分层浇筑施工的零号块将在上下层混凝土交界面附近形成一条拉应力带；过早拆模会使混凝土内外温差迅速扩大，而养护4 d后拆模混凝土内外温差相对较小，建议零号块拆模前养护时间不宜少于4 d。 In order to explore the development law of concrete hydration heat temperature of box girder by distinct-layer casting and accurately calculate the temperature stress, the concrete hydration heat in the No.0 block of box girder of a long span (230 m) PC continuous bridge was observed continuously. Based on the field test results and the numerical simulation calculation by FEA, the temperature stress development law of the bottom plate, web and diaphragm were analyzed. Meanwhile, the influence of the construction scheme on the hydration heat temperature stress of the No.0 block of box girder was discussed and the influence of the form removal time on temperature difference was researched. The results show that the excessive temperature difference can cause the excessive temperature stress and the temperature cracks. Besides, the tensile stress field can be formed near the interface between the top and the bottom concrete in the No.0 block of box girder by distinct-layer casting. The research results also show that the form removal time should not be less than 4 days to prevent temperature cracks.

邹惠琼,白洪涛,李梅.混凝土箱梁分层浇筑水化热实测与模拟分析[J].混凝土与水泥制品,2022(6):77-81. ZOU H Q,BAI H T,LI M.Measurement and Simulation Analysis of Hydration Heat of Layered Pouring Concrete Box Girder[J].China Concrete and Cement Products,2022(6):77-81.