“粉笔是物质”命题辨析

生活实践和哲学理论都表明 :“粉笔是物质”这种命题是成立的。马克思主义哲学认为 ,任何事物都是个别和一般的对立统一 ,人的认识中的个别和一般的关系乃是客观事物中的个别和一般的关系之反映。个别和一般的关系在客观事物中表现为 :现象和本质的关系 ;个体和类的关系。反映在人的认识中则相应地表现为 :感性认识和理性认识的关系 ;个别概念和一般概念的关系。人们习惯地把这些关系看作是现实具体与思维抽象的关系。要坚持个别和一般关系的辩证观点 ,就必须批判经验论和唯理论     

混凝土损伤的红外热像检测

本文利用混凝土的损伤与自身热导率变化的关系,借助红外热像仪,通过分析混凝土试样表面温度场分布的情况来判断混凝土试样内部损伤的区域和发展程度。     

沥青混凝土桥面铺装早期病害原因分析及铺装设计方法讨论

本文对钢筋混凝土桥柔性桥面铺装的早期病害及其原因进行了分析与研究,总结了当前国内桥面铺装结构分析的主要方法,讨论了桥面铺装的设计方法和今后主要的研究方向。     

论李煜的愁恨词

南唐后主李煜,在他流传下来的30多首词中,多数为言愁写恨之作。这些词真实地表现了作为特定人物李煜心灵活动的历史,真率地表达了一个经历沧桑巨变、沦为囚徒的帝王的悲哀和悔恨。在这些词中,李煜的愁情恨绪时而变作春江流水,时而又化为大地春草。这些丰富、真实而又生动的形象,表现了李煜具有将抽象的愁恨形之于具体的形象的非凡才能。在汴梁,李煜只能在睡梦中重新回到以往如梦的生活中去。所以,他亡国入宋后的词,几乎每一首都写了梦。     

Finite Element Analysis of Reinforced Concrete Plate Impacted by Block

A new concept of structurally dissipating rock-shed （SDR） was developed by the lab of Tonello IC and LOCIE-ESIGEC （ France）. To decide the dimension of the plate used in SDR, an ANSYS model which could simulate the impact of rock in the centre of the plate was established by Fabien Delhomme. By using this model, some finite element analyses are carried out in the present paper. Firstly, a plate impacted by a block is numerically simulated, the numerical results obtained from different mesh sizes are compared and the accuracy of the finite element model is verified. Then, the dynamic response of the plate impacted at the boundary and in the medium part is computed. By analyzing the stress in rebar, the most dangerous region of impact of plate was found. For a rectangular plate, the most dangerous region is at the corner of the plate when a block drops in. Finally, the whole deformation process of the plate under dropping block was simulated and a simplified definition （ effect zone） to describe the deformation process in different positions of plate was given. From this study, it is found that the impact only affects heavily within the effect zone.     

Numerical Calculation of Concrete Slab Response to Blast Loading

In the present paper, a dynamic plastic damage model for concrete has been employed to estimate responses of a reinforced concrete slab subjected to blast loading. The interaction between the blast wave and the concrete slab is considered in 3D simulation. In the first stage, the initial detonation and blast wave propagation is modelled in 2D simulation before the blast wave reaches the concrete slab, then the results obtained from 2D calculation are remapped to a 3D model. The calculated blast load is compared with that obtained from TM5-1300. Numerical results of the concrete slab response are compared with the explosive test carried out- in the Weapons System Division, Defence Science and Technology Organisation, Department of Defence, Australia.     

新型混凝土材料的组成及发展前景

简要论述了新型混凝土(高性能混凝土、活性微粉混凝土、低强混凝土、轻质混凝土、钢纤维混凝土、自密实混凝土、智能混凝土等)及混凝土增强材料(非金属配筋、新型预应力钢棒等)的材料组成,以及新型混凝土近年来在工程中的应用与发展.     

发展生态环境友好型水泥混凝土材料

文章论述了硅酸盐水泥混凝土的生产消耗资源、破坏环境的严重性,介绍了生态环境友好型水泥混凝土的概念以及几种当前研究和应用的最主要的生态环境友好型水泥与混凝土,提出发展生态环境友好型水泥混凝土是21世纪水泥混凝土材料的发展方向．     

钢管混凝土偏压构件受力性能实验分析

通过 2 5根钢管混凝土偏心受压短柱的实验 ,结果表明 ,偏心率对钢管混凝土偏压构件受力性能的影响最为显著     

防裂高效减水剂在水泥混凝土路面中的试验研究

通过研究在水泥混凝土中加入由膨胀组份EVA粉厦减水组份自行配制而成的防裂型高效减水剂。改善了水泥混凝土的力学性能、细观结构以及收缩性能。为特殊路段使用水泥混凝土路面提供了广阔的应用前景。