摘  要：通过在石灰石粉与低品质粉煤灰双掺绿色混凝土中掺加引气剂，使新拌混凝土的含气量在3%～5%之间，研究了含气量对此类混凝土的长期抗压强度、抗冻性能和抗氯离子渗透性能的影响。结果表明，引气剂的掺入使得石灰石粉与低品质粉煤灰双掺绿色混凝土的长期抗压强度有所降低，但可以明显提高此类混凝土的抗冻性能，而对此类混凝土的抗氯离子渗透性能影响不大。Abstract:Throughmixingairentrainingagent,theaircontentoffreshconcretewithlimestonepowderandlow-qualityflyashisbetween3%to5%.Theinfluencesofaircontentonthelong-termcompressivestrength,frostresistanceandtheabilitytoresistchlorideionpenetrationofgreenconcreteareresearched.Theresultsshowthattheairentrainingagentmakesconcrete，slong-termcompressivestrengthreduce,butitcanobviouslyimprovethefrostresistanceofgreenconcrete,andithaslittleeffectontheabilitytoresistchlorideionpenetrationofconcrete.

摘 要：通过相关实验，研究了不同掺量情况下的自燃煤矸石植生型生态混凝土的制备工艺和性能。试验结果表明，随着煤矸石集料掺量的逐步提高，生态混凝土强度逐步下降，但下降幅度不大，pH值适中，可以满足植生生态混凝土的功能要求。随着集料级配的增大，生态混凝土的强度逐步下降，孔隙率逐步提高。采用P·O 42.5水泥、20～40mm煤矸石、中砂、外加剂ZS-2等原材料配制的植生型生态混凝土，在强度、pH值、孔隙率等方面均可满足植物生长的要求。 Abstract: The preparation process and properties of coal gangue eco-concrete for planting has been discussed in the condition of different addition amounts of coal gangue through the relevant experiments. The results show that with the increase amount of coal gangue, the strength of concrete decreases gradually but its decrease range is somewhat, and the pH value is moderate. The strength and the pH value can meet the need of the functional requirements of eco-concrete for planting. With the increase of the aggregate gradation, the strength of concrete also decreases gradually but the porosity of concrete increases step by step. The coal gangue eco-concrete for planting prepared by P·O 42.5 cement, 20~40mm coal gangue, medium sand, ZS-2 admixture can meet the demand of plants growth in strength, pH value, porosity.

摘 要：以南京某工程为例，介绍了先施工底板后施工桩基础的逆作施工方法，解决了该工程因设计变更而造成的支护桩支护能力不足问题，确保了工程的顺利施工。 Abstract: Taking one project in Nanjing, the inverse construction method of the first floor construction then the construction of the pile foundation is introduced, which can solve the problem of design change causing the supporting ability of supporting piles insufficient, and ensure the engineering construction smoothly.

摘 要：研究了C50清水混凝土配合比设计技术要点以及生产组织和混凝土现场浇注施工、养护过程中的关键措施。通过优选水泥、粉煤灰和微珠，调整粉料比例以及砂率、用水量，遴选高性能外加剂，配制出了具有适宜粘聚性和工作性能的清水混凝土。 Abstract: The key technology of mix proportion design of fair-faced concrete is studied. At the same time, the producing organization, casting process and curing technology in situ are also presented. The fair-faced concrete with appropriate cohesiveness and workability is prepared by means of optimizing cement, fly ash, micro-sphere, high performance admixture, binder proportion, sand ratio and unit water consuption.

摘  要：基于现有的菱镁板生产线实际生产情况，设计了一种新型用于菱镁板生产线养护房自动控制的装置。该装置以单片机为核心，利用CAN总线技术和传感器技术组建了菱镁板养护房的自动控制系统的节点及网络架构。介绍了系统总体结构、主要的硬件设计和关键的软件流程。 Abstract:Basedontheexistingmagnesiumboardproductionlineactualsituation,anewtypeofequipmentformagnesiumboardproductionlinemaintenanceroom'sautomaticcontrolsystemisdesigned.Thisequipmentusesthesingle-chipmicrocomputerasitscore,withCANbusandsensortechnology,thenodeofautomaticcontrolsystemaboutmagnesiumboardmaintenanceroomandthenetworkstructureareorganized.Theoverallstructureofthesystem,themaindesignofhardwareandthekeysoftwareprocesshavebeenintroducedinthispaper.

摘 要：研究了再生骨料自密实混凝土堆石墙体在静荷载作用下的力学性能及破坏形态，结果表明，再生骨料自密实混凝土墙体具有较高的承载力，特别是抗压强度远远大于普通毛石砌体，而且自密实混凝土和再生骨料之间的粘结性能良好；其破坏形态与天然大直径骨料堆石混凝土相近，破坏性质亦属于脆性破坏，但下降段较缓。再生骨料自密实堆石混凝土可取代普通毛石砌体，其工程应用前景广阔。 Abstract: The failure mode and mechanical properties of recycled aggregate-filled self-compacting concrete wall under static load are studied. The results show that the recycled aggregate self-compacting concrete wall can bear higher load than ordinary rubble stone masonry, especially its compressive strength, and it has good bonding properties between self-compacting concrete and recycled aggregates. Its failure mode is similar with the big natural aggregate-filled concrete’s. Its destruction property belongs to brittle failure, but the stress-strain curve decreases slowly. Therefore, recycled aggregate-filled self-compacting concrete can replace ordinary rubble stone masonry and has further engineering application prospect.