摘 要：回弹法检测废弃混凝土构件并快速分级生产不同质量等级再生骨料及再生粉状颗粒，添加石灰及粉煤灰配制二灰碎石。设计正交实验，通过重型击实、无侧限抗压强度等试验分析再生骨料质量、二灰掺量、再生粉状颗粒等因素对其性能影响规律并得出最佳配比范围。试验表明，再生骨料及再生粉状颗粒可以不同程度替代天然骨料及粉煤灰，配置力学性能满足承载基层要求的半刚性基层材料。 Abstract: The content of waste concrete has been quickly classified with the method of rebound testing to produce different quality grades of recycled aggregates. Then lime and fly ash are added to make lime-fly ash gallet. Designing orthogonal test, the effect of quality of recycled course aggregates, the content of lime-fly ash, regenerated waste concrete powder on matrix is analyzed through the method of heavy compaction test and unconfined compressive strength test. The range of best mix proportion of recycled aggregates lime-fly ash is obtained. This research proves that recycled aggregates and powder can change natural aggregates and fly ash by different levels. The mechanical properties of lime-fly ash regenerated from waste concrete can meet the requirement of loading based layer.

摘 要：阐述了废橡胶粉在普通混凝土、沥青混凝土、防水材料以及其他建筑材料中的应用现状，建议今后逐步建立橡胶粉利用的主导地位，并大力加强其在建材领域的应用研究和推广工作。 Abstract: The application status of crumb rubber in normal concrete, asphalt concrete, waterproofing material and other materials are expounded, and it’s suggested that the dominant position of crumb rubber utilization be established gradually and applied research and extension work of crumb rubber in the field of building materials be strengthened vigorously.

摘 要：对某在建工业厂房混凝土结构质量进行了检测，发现混凝土强度偏低、现浇板开裂渗漏等病害，分析了泵送商品混凝土冬季施工病害产生的原因，评估了混凝土强度、裂缝和冻融深度，提出了针对性的工程防治措施，保证了后续工程建设的质量。 Abstract: The concrete structure quality of an industrial building was detected, and some construction diseases such as low concrete strength, cracking and leaking of slabs were found. The reasons of pumping premixed concrete diseases in winter construction are analyzed. The concrete strength, cracks and frozen depth are assessed. In addition, some pertinence engineering measures are put forward to ensure the quality of follow-up project construction.

摘 要：针对钻孔灌注桩混凝土大流动性和高耐久性的技术要求，对芜湖长江公路二桥主桥钻孔灌注桩用C35高性能混凝土从原材料选择、配合比设计以及混凝土性能三方面进行了研究。实际施工效果表明，按照高性能混凝土理念设计和施工的钻孔灌注桩混凝土的粘聚性和流动性好，且无泌水、离析现象，芯样测试结果也证明了钻孔灌注桩混凝土满足设计强度和耐久性要求，内部结构密实、无裂缝。 Abstract: Aiming at the technical requirements of high fluidity and good durability of bored cast-in-situ pile concrete, C35 high performance concrete for bored cast-in-suit pile in the main bridge of No.2 Wuhu Yangtze River Highway Bridge was investigated. Raw materials selection, mix proportion design and properties of the concrete were especially researched. Actual construction shows that the bored cast-in-situ pile concrete, designed and implemented according to the concept of high performance concrete, appears good adhesiveness and fluidity, without bleeding and segregation. Core samples test results also prove that the strength and durability of pile concrete can meet the design requirements, and the concrete are dense and free of cracks.

摘 要：建材行业标准JC/T 2163-2012《混凝土外加剂安全生产要求》已发布实施，为便于该标准在企业生产中的实施和应用，介绍了外加剂安全生产指标要求和安全生产技术、标准应用时的注意事项等内容。 Abstract:Building materials industry standard JC/T 2163-2012 "Safety requirements for production of concrete admixture" has been implemented. For implementation and application of the standard in enterprise production, the requirements of admixture production safety index and safety technology and the main attentions in standard application etc. of industry standard JC/T 2163-2012 are introduced.

摘  要：结合某实际工程的地下车库顶板结构设计方案，介绍了蜂巢芯空腹楼盖的基本构造及设计方法，并以密肋楼盖结构作为对比方案，计算了两种楼盖方案的技术经济指标，对比分析结果表明，地下车库顶板采用蜂巢芯空腹楼盖具有良好的技术优势和经济效益；且随着使用荷载的增加，空腹楼盖的经济性在大空间、大跨度的地下结构顶板中表现得更为明显。Abstract:Accordingtothestructuredesignofundergroundgaragerooffromapracticalproject,thebasicstructureanddesignmethodofthehoneycombedcorehollowfloorareintroduced,andtheribbedslabasacontrastscheme,economicandtechnicalindexesoftwokindsoffloorschemesarecalculated.Theresultsshowthatthegarageroofwithhoneycombedcorehollowfloorhasagoodtechnicalandeconomicadvantage;andwiththeincreasingofloads,theadvantageofhollowflooreconomyappliedinlargespace,largespanundergroundstructureroofismoreobviously.