废混凝土粉在建筑砂浆中的应用研究

研究了废混凝土粉以不同取代率取代建筑砂浆中的天然砂对砂浆的和易性及强度的影响 ,结果表明 ,废混凝土粉可以取代建筑砂浆中的部分天然砂配制再生骨料砂浆。     

钢渣处置工艺的清洁生产研究与实施

该课题研究了用水淬法和蒸汽法相结合的技术消除钢渣中的游离氧化钙;用传统的破碎磁选与高精度的强磁选相结合,以独创的递进除铁技术使钢渣中的含铁量由18%降至1%;用专项技术改制的管式磨、活化环,蒸汽熟化,递进式除铁,o-sepa选粉,高频振动粉磨,PPC集料器组成钢渣微粉清洁生产工艺.结果表明该工艺在国内尚属首例,具有较好的推广应用价值.     

全固废无水泥钢渣重载路面混凝土的研究及工程应用

在完全不使用硅酸盐水泥的条件下,系统研究了以碱溶液激发钢渣、矿渣细粉、粉煤灰等工业废渣粉制备胶凝材料,钢渣为粗细骨料全部代替传统天然砂石,配置路面混凝土。配置出28d抗压强度达44MPa,抗折强度达8.3MPa同时具有良好工作性能的钢渣路面混凝土。进行重载路面工程试验的效果良好。     

浅谈水电工程中混凝土生产系统环保措施

以现在水电工程建设中的混凝土生产系统为基础，从水土保护保持、废水、废气、废油排放，粉尘污染，噪声污染，交通运输，废料，生活废水，垃圾等方面为工程提供混凝土生产系统的环保控制措施。     

酸雨对混凝土建筑物和文物损坏机理的研究

介绍了酸雨对混凝土建筑物和文物损坏机理的宏观分析,水泥中加入少量石膏,可延缓凝结时间,但当加入量大,将引起水泥膨胀,以致溃裂,探讨了酸雨对混凝土建筑物与文物损坏的微观分析,特别是酸雨等生成各种硫酸盐,通过从化学反应原理上分析了酸雨中二氧化硫与混凝土中钙离子反应生成石膏机理,从石膏特性上探讨了酸雨对混凝土建筑物和文物侵蚀机制,并由此提出了酸雨条件下保护混凝土建筑物和文物应对措施。     

MODELING A CONCRETE BLOCK IRRIGATION DIVERSION SYSTEM1

ABSTRACT: Concrete block irrigation diversion systems have been proposed as alternatives to permanent dams of concrete or rock or temporary gravel berms. Permanent dams can cause stream channel instability, bank erosion, sediment pollution, ice flow blockage, and safety problems for recreational floating craft. Temporary berms can require substantial streambed disturbance and can promote sediment pollution, stream bank instability, and bank erosion. A design procedure was developed based on a model of the hydraulic performance of concrete block diversion systems. The procedure was used to model a site on the Gallatin River in Montana. The method relies on HEC-RAS (Hydrologic Engineering Center -River Analysis System) software combined with analytical techniques in an iterative scheme. The hydraulic performance of different diversion configurations (the existing heavy-rock diversion system, concrete blocks oriented parallel to flow, and concrete blocks oriented diagonally) was assessed using the model under a range of flow rates. The minimum diversion dimensions (length, number, and size of blocks) that maintained block stability while diverting the requisite flow were determined for each model run. At the Gallatin River site, the block system oriented parallel to flow required less diversion material than the diagonal orientation. The recommended diversion length was 51.8 m (170 ft). Trapezoidal blocks with a top width of 20.3 cm (8 in), a height of 45.7 cm (18 in), and side slopes of 2 vertical to 1 horizontal were specified. This configuration minimizes the total block mass, diverts the required flow, and has a factor of safety of 2.0 against block displacement.     

Identification of non-value adding (NVA) activities in precast concrete installation sites to achieve low-carbon installation

The lean production philosophy has been applied in the construction industry to reduce waste and increase efficiency. It is until recently that the lean philosophy has proven to be effective to meet the challenges of sustainable development. Many studies have shown that lean philosophy can be applied in precast concrete factories to lower inventory, reduce waste and increase efficiency. However, the precast concrete installation cycle should not be overlooked following a life cycle perspective. This study adopts a weighted factor model comprising 30 contractors in the Singapore construction industry and a case study. Construction site layout management practices are investigated using the weighted factor model. Strategies to improve the construction site layout are presented in a case study. The results indicated that there are many non-value adding activities in the site layout management practices that contribute to an increase in the carbon emissions level. Little consideration of green building materials, improper specifications of the precast concrete products, lack of an uninterrupted workflow, and inaccurate estimation of seem to be the most important ones. The results provide good practice guidance and can be used as a checklist for contractors to identify the NVA activities in the installation sites to achieve low-carbon installation. The results will also be useful for regulatory agencies to provide recommendations for contractors to improve the installation procedure and reduce carbon emissions.     

Non-point source analysis of a railway bridge area using statistical method：Case study of a concrete road-bed

In an effort to protect the quality of the water system, interest in non-point source pollution is increasing. Recently, studies of non-point sources pollution are continuing in relation to various land- use areas, but such studies have not been fully conducted in railway facility sites. Using monitoring data of railway bridge area with concrete road-bed, the runoff characteristics, pollutant unit loads, and first flush criteria were assessed. Railway bridge area with concrete road-bed typically show the first flush effect, and the pollutant unit load was determined to be higher than other public facilities areas. Further, the first flush criteria show an effective rainfall amount of 7 mm. In other words, from the runoff of railway facilities, considerable amounts of non-point source pollutants are occurred, indicating the need to create best management practices which are adequate for railway facility sites.     

海洋混凝土结构表面防护涂料环境适应性评价研究进展

综述了岛礁混凝土结构表面防护涂料海洋环境适应性评价（老化）研究进展,对表面防护涂料海洋环境适应性评价中试验设计、控制因子设定、试验方法选择、评价指标确定等环节中存在的问题进行了讨论,认为只有在认真梳理单环境因子对涂料作用机理的基础上,对它们进行合理设定,才能有效提高加速试验结果和自然暴晒老化试验结果的相关性。     

极端降雨条件下透水水泥混凝土路面削流除污试验研究

通过试验,对极端降雨条件下透水水泥混凝土路面在削减洪峰流量、径流总量以及去除污染物的效果进行研究。试验表明,在降雨历时60 min,降雨量为110,135,163 mm的情况下,透水水泥混凝土路面削减径流总量为55%~69%,削减洪峰流量为55%~63%;对SS、COD、TN、TP的去除率分别为82%~95%、58%~78%、31%~74%、59%~80%。结果表明,在极端降雨情况下,透水水泥混凝土路面在削流除污方面的效果较好,且与一般降雨条件下的除污效果相近,因此在暴雨情况下,也可产生较好的环境效益,表明其具有气候普适性,是一种良好的海绵城市建设技术。