摘   要：以水泥、粉煤灰和石灰石粉为胶凝材料，制备了一种低温升主塔大体积混凝土，研究了石灰石粉掺量（5%、10%、15%）对砂浆流变性能和混凝土绝热温升、干燥收缩性能、力学性能、抗渗性能的影响，采用SEM观察了水化产物的微观形貌，并与水泥-粉煤灰-矿渣粉胶凝体系（对照组）进行了对比。结果表明：与对照组相比，掺入石灰石粉可以降低砂浆的塑性黏度和屈服应力，延缓胶凝材料的水化进程，降低混凝土的绝热温升；石灰石粉的掺量越大，抑制混凝土干燥收缩的作用越显著；随着石灰石粉掺量的增加，混凝土的抗压强度下降，但掺5%石灰石粉混凝土的抗压强度较对照组高；与对照组相比，掺石灰石粉混凝土的抗渗性能较好，掺5%石灰石粉混凝土的抗渗性能最好。 Abstract: Taking cement, fly ash and limestone powder as cementitious materials, the mass concrete with low temperature rise for main tower was prepared. The effects of limestone powder content(5%, 10%, 15%) on the rheological properties of mortar, adiabatic temperature rise, drying shrinkage, mechanical properties and impermeability of concrete were studied, and the microscopic morphology of hydration products was observed by SEM. The results were compared with those of cement-fly ash-slag powder cementitious system (control group). The results show that compared with the control group, adding limestone powder can reduce the plastic viscosity and yield stress of mortar, delay the hydration process of cementitious materials, and reduce the adiabatic temperature rise of concrete. The greater the content of limestone powder, the more significant the effect of inhibiting the drying shrinkage of concrete. With the increase of limestone powder content, the compressive strength of concrete decreases, but the compressive strength of concrete mixed with 5% limestone powder is higher than that of control group. Compared with the control group, the impermeability of concrete mixed with limestone powder is better, and the impermeability of concrete mixed with 5% limestone powder is the best.

盖珂瑜,龙勇,刘爱林,等.石灰石粉对主塔大体积混凝土性能的影响[J].混凝土与水泥制品,2023(4):88-92. GE Ke-yu, LONG Yong, LIU Ai-lin,et al.Effects of Limestone Powder on Properties of Mass Concrete for Main Tower[J].China Concrete and Cement Products,2023(4):88-92.

摘   要：基于蒙特卡罗方法，采用FLUKA软件建立了中子源散射球壳和质子源入射水靶球壳数值模型，分析了不同厚度钢渣混凝土对不同能量等级和不同屏蔽角度中子射线的屏蔽能力，并与普通混凝土进行了对比。结果表明：随着屏蔽厚度的增加，混凝土对中子射线的屏蔽能力不断提升；混凝土对慢中子射线和中能中子射线的屏蔽效果优于快中子射线；钢渣混凝土对中子射线的屏蔽效果优于普通混凝土；屏蔽角度越大，使关注点剂量当量率满足规范要求的混凝土屏蔽厚度越小；用钢渣混凝土取代普通混凝土可显著减小材料的屏蔽厚度。 Abstract: The numerical models of neutron source scattering spherical shell and proton source incident water target spherical shell were established by FLUKA software based on Monte Carlo method. The shielding ability of steel slag concrete with different thickness to different energy neutron rays was analyzed and compared with ordinary concrete. The results show that with the increase of shielding thickness, the shielding ability of concrete on neutron rays is improved continuously. The shielding effect of concrete on slow neutron rays and intermediate neutron rays is better than that of fast neutron rays. The shielding effect of steel slag concrete is better than that of ordinary concrete. The larger the shielding angle, the smaller the concrete shielding thickness that makes the dose equivalent rate of the point of concern meet the specification requirements. Using steel slag concrete can significantly reduce the shielding thickness instead of ordinary concrete.

高鹏,张俊杰,王成刚,等.基于蒙特卡罗方法的钢渣混凝土的中子屏蔽性能模拟[J].混凝土与水泥制品,2023(4):93-97. GAO P,ZHANG J J,WANG C G,et al.Simulation of Neutron Shielding Performance of Steel Slag Concrete Based on Monte Carlo Method[J].China Concrete and Cement Products,2023(4):93-97.

摘   要：采用再生微粉和工业废渣固化淤泥，研究了固化材料的类型（工业废渣基固化材料A、工业废渣-再生微粉基固化材料B）和掺量（5%、10%、15%、20%）、淤泥含水率（17%、45%、70%）对固化淤泥力学性能的影响，并进行了XRD和SEM分析，探讨了固化机理。结果表明：固化材料B的抗压强度比固化材料A的抗压强度低；固化材料B固化淤泥的无侧限抗压强度比固化材料A固化淤泥的无侧限抗压强度低；随着固化材料掺量的增加，固化淤泥的无侧限抗压强度增大；随着淤泥含水率的增加，固化淤泥的无侧限抗压强度降低；综合考虑经济性、节能环保和固化淤泥的力学性能，推荐采用固化材料B作为淤泥的固化材料。 Abstract: The effects of the types(industrial waste slag based solidified material A, industrial waste slag-recycled micropowder based solidified material B) and contents(5%, 10%, 15%, 20%) of solidified materials and the moisture content of the sludge (17%, 45%, 70%) on the mechanical properties of the solidified sludge were studied. The solidified mechanism was discussed by XRD and SEM analysis. The results show that the compressive strength of solidified material B is lower than that of solidified material A. The unconfined compressive strength of sludge solidified by solidified material B is lower than that of sludge solidified by solidified material A. The unconfined compressive strength of solidified sludge increases with the increase of the content of solidified material. With the increase of moisture content of sludge, the unconfined compressive strength of solidified sludge decreases. Considering the economy, energy conservation and environmental protection and the mechanical properties of solidified sludge, solidified material B is recommended as the solidified material of sludge.

黄展魏,王安辉,张艳芳,等.工业废渣和再生微粉协同固化淤泥的性能研究[J].混凝土与水泥制品,2023(4):98-102. HUANG Z W,WANG A H,ZHANG Y F,et al.Study on the Performance of Sludge Solidified by Recycled Micropowder and Industrial Waste Slag[J].China Concrete and Cement Products,2023(4):98-102.

选择不同灌浆料制作了标准试件和模拟孔道PVC管试件，根据DB32/T 3754—2020《装配整体式混凝土结构检测技术规程》的要求，基于标准试件的抗压强度和模拟孔道PVC管试件的表面硬度建立了灌浆料测强曲线，分析了测强曲线对灌浆料龄期和抗压强度的适用性。结果表明：在灌浆料龄期≥14 d或抗压强度≥60 MPa的情况下，采用DB32/T 3754—2020中的方法建立的灌浆料测强曲线的适用性更强，可为实际工程中不同灌浆料实体抗压强度检测时间的选取提供参考。 Different sleeve grouting materials were selected to make standard test pieces and PVC pipe test pieces with simulated channels. According to the requirements of DB32/T 3754—2020 Technical Specification for Inspection of Monolithic Precast Concrete Structure, the strength curve of the grouting material was established based on the compressive strength of standard test pieces and the surface hardness of PVC pipe test pieces with simulated channels, and the applicability of the strength curve to the age and compressive strength was analyzed. The results show that when the age of grouting material is ≥14 days or the compressive strength of grouting material is ≥60 MPa, the strength test curve of grouting material established by the method in DB32/T 3754—2020 is more applicable, which can provide a reference for the selection of the testing time of the solid compressive strength of different grouting materials in practical projects.

赵建华,谢慧晟,张建宇,等.灌浆料测强曲线对龄期与抗压强度的适用性研究[J].混凝土与水泥制品,2023(4):85-87,92. ZHAO J H,XIE H S,ZHANG J Y,et al.Study on the Applicability of Grouting Material Strength Curve to Age and Compressive Strength[J].China Concrete and Cement Products,2023(4):85-87,92.

为便于 JC/T 2723—2022《预应力混凝土实心方桩》的使用方准确理解标准条款的具体含义，正确贯彻实施标准条款的具体要求和规定，简述了该标准的编制背景、编制目的和意义，解释说明了标准条文的具体内容，并指出了标准实施过程中应注意的事项。 In order to facilitate the user of JC/T 2723—2022 Prestressed Concrete Solid Square Pile to accurately understand the specific meaning of the standard terms and correctly implement the specific requirements and provisions of the standard terms, the preparation background, purpose and significance of the JC/T 2723—2022 are briefly described, the specific contents of the standard provisions are explained in detail, and the problems that should be paid attention to in the implementation process are put forward.

蒋元海.JC/T 2723—2022《预应力混凝土实心方桩》标准解读[J].混凝土与水泥制品,2023(4):81-84. JIANG Y H.Interpretation on JC/T 2723—2022 Prestressed Concrete Solid Square Pile[J].China Concrete and Cement Products,2023(4):81-84.

摘   要：基于项目的绿色快速建造需求，提出了一种适用于高层工业厂房的免模、免支撑装配整体式框架-现浇剪力墙结构体系（由带牛腿的预制混凝土柱、现浇剪力墙、带牛腿或挑耳的预制叠合梁和预应力空心板构成的体系）。工程应用效果表明：通过在预应力空心板板顶设置后浇叠合层、布置单层双向钢筋，有效提高了楼盖整体性；通过在预应力空心板板端上部开槽，端部布置钢筋桁架或钢筋网，端部浇筑密实，避免了预应力空心板在极端工况下脱落。同时，有限元分析结果表明：通过上述构造措施还可提高楼盖的整体性和抗震性。 Abstract: Based on the green and rapid construction requirements of the project, a temlate-free and support-free assembly monolithic frame-cast-in-place shear wall structure system is proposed suited for high-level factories. The structure system consists of prefabricated columns with corbels, cast-in-place shear walls, laminated beams with corbels or pick ears, and prestressed hollow-core slabs. The engineering application effect shows that laying out the cast-in-place laminated layer and single-layer two-way reinforcements on the top of the hollow-core slab can improve the floor integrity. Sloting at the upper end of the hollow-core slab and placing reinforcements truss or mesh and then pouring concrete densely,can effectively prevent the hollow-core slab falling off. The finite element analysis results show that through these structural measures above can improve the integrity and seismic resistance of the floor.

袁佳佳,王洪欣,陈培潮,等.新型装配式混凝土结构体系在高层工业厂房中的应用研究[J].混凝土与水泥制品,2023(4):63-67. YUAN J J,WANG H X,CHEN P C,et al.Application Research on the New Prefabricated Structural System of the High-Level Factory[J].China Concrete and Cement Products,2023(4):63-67.