沥青混合料离析成因及控制

从沥青路面水损害破坏出发，指出沥青混合料的离析是造成水损害破坏的根本原因，分析造成离析及不均匀的原因，提出了防止离析及不均匀的技术措施。     

沥青路面离析产生的原因及防治措施探讨

介绍了沥青混合料的离析分类,通过分析在沥青施工中离析产生的原因,从沥青混合料的结构类型、原材料、拌和、摊铺及碾压等方面对防治离析的措施进行了探讨,以保证沥青路面的施工质量及使用寿命.     

红外热像仪在路面离析检测和评定中的应用

介绍了红外热像仪的特点,阐述了热像仪在沥青路面离析检测和评定中的应用情况,并通过试验数据的对比,显示温度离析对沥青路面性能的影响规律,从而给出了离析评定的标准,以提高沥青路面的施工质量,促进我国高速公路建设的发展。     

浅析住宅设计动静分区的几种方法

随着生活和物质水平的提高，现在的住宅已不仅仅是给人们提供一个简单的满足人的吃住等生理要求的场所，他应是在满足人们生理要求的同时，还满足人们的心理要求，这也是健康住宅的基本要求之一。住宅的动静分区可以避免动静干扰，给人们的生活，学习，工作带来安静，舒适的环境，从而在一定程度上满足人的心理要求，提高居住质量。文章对近些年来各种动静分区的方法从设计，施工及使用几个方面进行了分析比较，找出了各自的优点和缺点，并提出在设计施工中应注意的事项。另在选择动静分区方式时，还应综合考虑各种因素，以满足不同地区，不同人群的需求。     

高强轻集料混凝土工作性能优化的试验研究

以分层度、坍落度、扩展度为新拌混凝土工作性能的评价指标,研究了矿物掺合料、砂率、增粘剂和减水剂对高强轻集料混凝土(LWAC)工作性能的影响.结果表明:增粘剂、减水剂是影响LWAC工作性能的主要因素,矿物掺合料、砂率对LWAC工作性能的影响则较小;在相同条件下,复掺减水剂和增粘剂比单掺减水剂更能改善轻集料混凝土的匀质性,同时对抗压强度也有所提高.最后提出了高强轻集料混凝土工作性能优化的试验配合比.     

沥青路面施工离析现象的成因和检测及解决

对高速公路沥青路面施工中原材料的堆放、拌和、运输、摊铺等几个环节可能产生的离析现象进行了分析，提出了几种现场检测方法和一些具体的解决办法。     

大都市核心区的社会空间隔离--以上海市静安区南京西路街道为例

当今,我国城市正经历着重要的社会转型,一方面新的社会阶层的成长使得社会结构更加复杂,另一方面全球化和经济重组则趋于导向增长的社会极化.就空间趋势而言,隔离已在多种尺度上出现.大都市核心区马赛克状的隔离是不平衡开发的直接产物,而一个极化的居住结构是日益锐化的社会经济隔离的自然结果.通过对上海市静安区南京西路街道地区的案例,研究了大都市核心区的社会空间隔离.     

减轻沥青混合料离析的技术措施

借鉴国内外的研究成果并通过工程实例,分别从沥青路面施工工艺、采用沥青混合料转运车、混合料设计、原材料控制等方面提出减轻沥青混合料离析的技术措施,以提高沥青路面摊铺的均匀性,从而延长路面的使用寿命。     

A continuum model for the segregation of bidisperse particles in a blade mixer

The process of blending powders using stirring blades involves complicated granular flows, particle-scale mechanisms, and blade–particle interactions, which is challenging to predict and control. This article proposes a continuum-based model for such a process by incorporating the flow rheology, isotropic particle diffusion and the percolation of granular materials. A method combining finite element method (FEM), finite difference method (FDM), and immersed boundary method (IBM) is developed to numerically implement the continuum model and applied to a cylindrical blade mixer. The model well describes the tempo-spatial distribution of small/large particles in the stirring process, such as the accumulation of small particles in the vicinity of blades. Remarkably, this model can capture the various intricate effects of blade parameters, including the blade rake angle, rotating speeds, filling level, and the friction coefficient of the mixer wall. It is therefore promising for optimizing the blade mixers in industries.     

Segregation and intermixing in polydisperse liquid–solid fluidized beds: A multifluid model validation study

Multifluid model (MFM) simulations have been carried out on liquid–solid fluidized beds (LSFB) consisting of binary and higher-order polydisperse particle mixtures. The role of particle–particle interactions was found to be as crucial as the drag force under laminar and homogenous LSFB flow regimes. The commonly used particle–particle closure models are designed for turbulent and heterogeneous gas–solid flow regimes and thus exhibit limited to no success when implemented for LSFB operating under laminar and homogenous conditions. A need is perceived to carry out direct numerical simulations of liquid–solid flows and extract data from them to develop rational closure terms to account for the physics of LSFB. Finally, a recommendation flow regime map signifying the performance of the MFM has been proposed. This map will act as a potential guideline to identify whether or not the bed expansion characteristics of a given polydisperse LSFB can be correctly simulated using MFM closures tested.