全矿渣流态混凝土和全矿渣特种混凝土的配制与应用

随着工程建设的发展和对混凝土骨料需求的日益增长，应用高炉重矿渣粗，细骨料配制流态泵道混凝土及防水，耐热混凝土及扩大石材资源，并实现混凝土改性和降低成本物有效途径。介绍了全矿渣流态混凝土及全矿渣防水，耐热混凝土的工艺性能及其应用。     

混凝土四重球弹性模量随龄期发展预测模型

混凝土的抗压强度和弹性模量随龄期不断增长.然而,与抗压强度相比,弹性模量随龄期的增长并不明显,相关的研究也较少.本文在混凝土弹性模量双重球和三重球预测模型的基础上,考虑了水泥浆体与骨料间的界面过渡区效应,建立了混凝土弹性模量四重球理论模型,且模型能够较好的反映界面过渡区在混凝土弹性模量发展中的作用.分析表明,对混凝土弹性模量发展起到主要作用的参数按重要程度依次为骨料体积分数、骨料粒径及界面过渡区效应.     

冶金工业厂房拆除废料制作混凝土骨料的研究进展

介绍了国际上回收建筑拆除废料再利用制作混凝土骨料的研究进展,为我国相关研究提供帮助.由于我国工业化和城市化进程加快及自然环境保护方面的硬性要求,大量老旧冶金工业厂房拆除,同时建筑混凝土骨料需求量增大.利用老旧冶金工业厂房建筑拆除废料制作混凝土骨料,既节约自然资源又能保护环境.     

轻骨料混凝土小型空心砌块的质量现状及改进措施

针对新疆哈密地区轻骨料混凝土小型空心砌块产品质量的检测结果,对这类产品存在的质量问题及其原因进行了分析,提出了改进产品质量的措施.     

混凝土用高炉渣骨料利用技术的近况

混凝土用高炉渣骨料JIS标准化已有20多年，但还没有真正被用于一般建筑工程的实例，使用量也停留在150万t／a左右。最近，为适应自然资源枯竭，保护自然资源的需要，要求使用再循环利用材料。本文在将高炉渣用于U侣地下储罐混凝土粗骨料和用于天然砂混合用细骨料研究的基础上，介绍了最近高炉渣骨料扩大应用的动向。叙述了在LNG地下储罐设施中，使用高炉渣粗骨料时确保泵压送性的措施和对超低温耐久性的评价。并介绍了作为天然砂的混用料，应用高炉渣细骨料时，抑制高炉渣细骨料的固结对策和有效地和天然砂混合的方法。     

钢纤维混凝土的工程应用研究

钢纤维因其能为基体混凝土裂纹提供联结作用，而被广泛用于增强普通混凝土材料。笔者在综合考察钢纤维混凝土工程应用的研究现状之后，以梅山铁矿为例对钢纤维混凝土工程应用的综合经济效益进行了评估，分析了钢纤维混凝土的阻裂与增强作用力学机理，并总结了一些具有工程实用价值的结论。     

碳纤维在混凝土结构加固中的原理与施工技术

碳纤维补强加固混凝土结构方法是近年来在国内外快速发展的一种结构补强加固新方法,由于碳纤维具有优良的物理力学性能,良好的粘结性、耐久性、自重轻、施工方便、快捷等优点,因而利用碳纤维加固混凝土构件,能有效地提高结构构件的承载能力、耐久性,由此达到对建筑物进行加固、补强的目的。文章以一个小型改造工程应用为例介绍了碳纤维在混凝土结构加固工程中的技术原理与施工技术。     

废弃混凝土资源化研究进展

废弃混凝土中砂石和水泥石颗粒回收用作再生骨料和再生水泥原料,是废弃混凝土有效资源化的基础.为了达到天然砂石骨料的性能,再生骨料需要经过颗粒整形、裂缝填充和去除黏附的水泥浆等物理化学强化处理.为了达到水泥原料的活性要求,废弃混凝土粉需要经加热和激发剂等活性激发.采用经强化和激发后的再生骨料和再生水泥可以拌制绿化混凝土、墙体砌块等混凝土再生品.综述了废弃混凝土在国内外建筑行业内的有效资源化途径,分析了资源化回用途径中关于再生骨料强化和再生水泥技术等存在的关键问题以及资源化研究的发展趋势.     

补偿收缩混凝土在某地下停车场工程中的应用

混凝土结构由于收缩引起的裂缝是长期困扰结构工程界的技术难题。本文介绍了掺膨胀剂的补偿收缩混凝土在超长结构工程中的应用,较好地解决了超长混凝土结构的裂缝问题。     

无粘结预应力混凝土在筒仓设计中的应用

本文结合新规范《混凝土结构设计规范》ＧＢＪ１０－８９，对预应力筒仓的设计方法，结合实际设计进行了一些思考，并从设计角度出发，加以整理，供今后设计参考。     

Research on the Use of FRP for Critical Load-Bearing Infrastructure in Conflict Zones

Research into the use of fiber-reinforced polymers (FRPs) in structures at the Royal Military College of Canada (RMC) during the past two decades has largely focused on two important military engineering goals—mobility and survivability. FRP research in the area of mobility has included the strengthening and repair of reinforced concrete beams and slabs and the development of portable lightweight bridges suitable for most wheeled and tracked vehicles. With respect to survivability, a particular interest is in the use of FRPs to enhance the blast resistance of structural columns and beams. Such research may be equally pertinent to improving the blast resistance of a broad range of critical domestic infrastructure worldwide, given both the increasing concerns about terrorist acts and the desire as well to improve resistance to accidental explosion. This paper will report on the experimental work of two of the most recent FRP research projects carried out at the RMC in support of military objectives—the development of a lightweight portable glass FRP bridge and the use of FRP to strengthen reinforced concrete structural columns against blast. A full-sized FRP box beam was constructed and tested in the laboratory and 28 half-scale reinforced concrete columns, some strengthened with either steel reinforced polymer (SRP) or with FRP, were tested in the field under blast load. From this research, it can be seen that FRP as a structural material offers significant advantages to military forces working in conflict zones, whether for traditional strengthening of damaged or understrength structures, lightweight portable bridge options, or as a means of strengthening structures against blast effects.     

道路工程冬季混凝土施工技术

介绍冬季混凝土施工技术在道路工程施工中的应用。     

Study on the properties and application of the steel slag special fine aggregate

The physical properties,grading stability and application stability of the steel slag special fine aggregate(diameter≤0.8 mm) at Baosteel were analyzed in this study,and the mechanical and working properties were studied when the aggregate was applied to concrete.The result shows that the aggregate has special advantages of hardness and wear-resistance,so it can be used as an excellent road surface material.The concrete mixed with the steel slag special fine aggregate exhibits good mechanical properties and working properties,which is safe and reliable.     

武钢钢渣用作AC-10I型细粒沥青砼集料的研究

分析钢渣用作AC-10I型细粒沥青混凝土集料的性质以及其用于沥青混凝土路面的使用性能,发现钢渣具有良好的物理力学性能。与传统路面相比,钢渣沥青混凝土的路面性能优良,具有广阔的应用前景。     

混凝土施工缝防水处理

工业建筑中,由于大部分设备基础及各种构筑物基本都埋设于地下,因此,结构的防水要求较高。对于混凝土壁渗水这个工程上的质量通病,长期以来,工程技术人员一直在寻找有效的解决方法。通过在马钢建设施工中施工缝防水处理的实践应用,总结了一些施工缝的防水处理措施。     

钢渣SMA-13沥青混凝土及其服役性能研究

分析了钢渣SMA-13沥青混凝土集料的性质以及其用于沥青混凝土路面的服役性能,发现钢渣具有良好的物理力学性能。与传统SMA沥青混凝土路面相比,钢渣SMA-13沥青混凝土的路面性能较优良,具有广阔的应用前景。     

高钛高炉渣碎石用做砼骨料的研究

攀钢高炉渣TiO2含量15%以上，与普通高炉渣的组成结构有较大差异，高钛高炉渣的性质研究及其用于砼的试验说明：高钛高炉渣结构稳定，其碎石用做砼骨料与普通碎石相比，抗压强度及劈拉强度稍高于后者。此外，其运用实例也说明了高钛高炉渣砼的稳定性。开发利用高钛高炉渣对环境保护，延长攀钢渣场使用年限具有重要意义。     

Demonstration of Use of High-Performance Lightweight Concrete in Bridge Superstructure in Virginia

The general objective of this research was the construction and evaluation of a bridge using high-performance lightweight concrete (HPLWC). The resulting bridge over the Chickahominy River near Richmond, Va., consists of 15 prestressed American Association of State Highway and Transportation Officials (AASHTO) Type IV girders made of HPLWC with a density of 1,920?kg/m3 and a minimum required 28-day compressive strength of 55?MPa. The bridge also has a lightweight concrete (LWC) deck with a density of 1,850?kg/m3 and a minimum required 28-day compressive strength of 30?MPa. This research study is chiefly concerned with investigating the effects of using lightweight concrete in prestressed girders on transfer length, development length, flexural strength, girder live-load distribution factor, and dynamic load allowance. Transfer length was determined to be 432?mm, or 33?db, for several girders at the time of prestress transfer. The development length was determined to be between 1,830 and 2,440?mm, while the flexural strength ranged from 11 to 30% higher than the AASHTO flexural capacity. The measured distribution factors and dynamic load allowance were smaller than the AASHTO standard and LRFD values.