Properties of Steel Fiber Asphalt Concrete and Its Application

To prevent asphalt pavement from cracking under low temperatures and prolong its fatigue life, we tested the properties of a new type of steel fiber asphalt pavement. The tests evaluated Marshall stability, dynamic ruts, and cleavage strength under both low and normal temperature conditions. We also analyzed the anti-corrosion property of steel fiber and the factors affecting the properties of the steel fiber asphalt mixture. The steel fiber asphalt pavement was installed on a highway in Chongqing, P. R. China to investigate the construction art of the steel fiber asphalt mixture and examine its effect in field use. The test results and concrete use in the field show that the cleavage strength and flexibility of steel fiber asphalt concrete increase due to the action of steel fiber. We conclude that the anti-cracking capacity of asphalt pavement under low temperature conditions can be improved by steel fiber. The construction art of steel fiber asphalt pavement is the same as common asphalt pavement without the necessity of anti-corrosion processing for steel fiber. The research results are useful for pavement material selection in low temperature regions and heavy traffic road pavement designs.     

公路水泥混凝土路面设计中的问题探讨

结合交通部新颁布的公路水泥混凝土路面设计规范和公路路面设计中存在的问题,对设计参数和标准的选择进行分析论证,提出了合理的路面设计思想和方法。     

透水性铺装地面的壤中流特征

人行道、步行街、自行车道、休闲广场和庭院等静负荷和动负荷较低、结构要求不高的硬化地面,改造为透水性铺装地面可以提高地表雨水下渗能力,减少地面积水,削减洪峰并延迟洪峰出现时间.利用人工模拟降雨试验,降雨均匀度超过80％,降雨强度分别为31.38、42.32、50.60、58.88、69.82、78.09 mm/h,对构筑的透水性铺装地面降雨入渗产流过程进行模拟研究.结果表明：在降雨历时60 min、降雨量小于78 mm的试验条件下,壤中流是透水性铺装地面总径流的主要组成形式,透水性铺装地面壤中流占总降雨量的比例随降雨强度的增大而增大,透水性铺装地面的铺设是导致地面壤中流发生和发展的主要原因.研究结果可为基于透水性铺装地面的雨水利用提供参考.     

Functional partition of cells in the gill epithelium of the Japanese eel, Anguilla japonica, and the role of hormones

Viable chloride and pavement cells were isolated from the gill epithelium of Japanese eel, Anguilla japonica, by a 3-step percoll gradient centrifugation at low speed. Viability of the isolated cells were tested by the trypan blue exclusion test, rhodamine-123, or pre-labelling the cells with fluo-3 Ca²⁺ dye and examined by laser confocal microscopy. Isolated chloride cells responded to ionomycin with a rapid increase in Ca²⁺ fluorescence, which was abolished by chelating external Ca²⁺ with EGTA. Peptide hormones, including arginine vasotocin, isotocin, insulin-like growth factor I and II, and urotensin I increased Ca²⁺ entry, urotensin II had no effect, and eel corpuscles of Stannius extract reduced residual Ca²⁺ fluorescence. Isolated chloride cells and pavement cells from eels were analyzed for their enzymatic activities involved in intermediary and nitrogen metabolism. Chloride cells had high levels of glutaminase I, glutamate dehydrogenase, glutamate oxalacetate transaminase, HCO₃-ATPase and carbamoyl phosphate synthetase II. Pavement cells had highly active glucose-6-phosphate dehydrogenase and AMP deaminase. Both had high levels of lactate dehydrogenase compared with other tissues.     

全液压脉动路面疲劳试验机设计原则初探

本文论述了可移动式野外疲劳试验机的设计过程、基本结构、性能参数及基本设计原则。为从事沥青路面结构研究的科研单位、高等院校及公路管理部门提供了可靠的试验机具。     

地质雷达在依勃公路路面质量检测中的研究与应用

本文介绍了地质雷达在公路路面强度和厚度检测的研究。     

优化方法在柔性路面厚度设计中的应用

The random test method and complex search method for optimization design in highway flexible pavement are used in this paper. The stress, strain and displacement in pavement structure can be computed by the mechanical analysis program of the multilayer el     

中国古典园林铺装的继承和发展

对古典园林铺装的材质和类型进行介绍,分析了其选材特点、纹样、特色和色彩,并指出其对现代园林铺装的启示,最后提出古典园林铺装在现代的应用,并结合实例进行分析。     

基于改进AHP的模糊评价在路面质量控制中的应用

针对传统AHP法经常出现一致性不满足的情况,通过引入最优传递矩阵得到改进AHP法,避免了一致性检验,并实现了计算机程序化.应用改进AHP法计算出路面质量控制指标体系中各个指标的权重,模糊综合评价分析施工质量控制情况,进而得到路面质量的控制等级。通过安徽某高速公路的施工质量控制进行实例分析,结果表明,该综合方法在施工质量控制中具有较强的可靠性和适用性,能实时监控路面施工,实现控制的针对性和时效性,是一种科学有效的综合方法。     

哈大高速公路水泥砼路面施工质量控制和评价

为确保哈大高速公路水泥砼路面施工质量,从砼材料的选择、配合比和抗折强度的确定、施工机具的要求以及施工工艺流程的控制等方面,进行了详细的阐述。并通过检测、对平整度、抗折强度和断板率等进行了评述。