Ladle castable is made from high qualified crog , corundum , magnesia and so on , which are mixed by binder . its thermal shock resistance , erosion resistance and volume steadiness are good . it ' s suited to the middle and small ladle and can be used for a long time 钢包浇注料是用优质矾土熟料、刚玉、镁砂、镁铝尖晶石和超微粉等材料，用不同结合剂和外加剂配制的，其特点是抗侵蚀性强、抗热震性好，体积稳定性好，适用于中、小型钢包使用，寿命长。
6 . when the rainfall frequency was 83 . 11 % that belong to low energy of rainfall , vegetation cover rate that was bigger than 80 % can totally diminish runoff energy , and prevent soil erosion . with eroded rainfall energy increasing the cut rate of vegetation for erosion gradually weak ( 6 )对于发生频率为83 . 11的低动能降雨，植被盖度80可完全削减径流能量，防止水土流失；随着侵蚀性暴雨动能的增加，植被对径流能量的削减率逐渐减弱。
The research of soil degradation in pur country is mainly concentrated on the red earth hilly area in the south in the past , and is less on the loess plateau that is one of the most fragile areas . based on field experiment and laboratory analysis , discuses the degradation mechanism , and raises the methods of refreshing and reestablishing land productivity of huangshan soil in chunhua county of shaanxi . in the hope of serving development of western regions and ecological environment construction that concede the land to forestry ( the grass ) 我国以前对土壤退化问题的研究主要集中于南方红壤丘陵区，对生态环境最脆弱的黄土高原地区的土壤退化研究相对较少，故本文以黄土高原地区陕西淳化县的侵蚀性黄?土为对象，通过野外人工模拟降雨试验和室内分析相结合的方法，探讨了侵蚀性黄?土的退化机理，提出了恢复和重建黄?土土地生产力的途径和方法，以期服务于西部大开发和退耕还林(草)的生态环境建设。
For concrete structure in the practical engineering , the non - mechanics damages , such as alkali - aggregate reaction , sulfate attack , carbonization , steel rust , freeze and thaw , and so on , are unavoidable due to the exist of erosive media . the deterioration form of mono or multi - factor influences on the concrete property of construction and durability greatly , and shortens the service life of the concrete to a large extent . permeability of concrete is the most important factor for these non - mechanics damages , so the permeability test of concrete is the normal and required item to study the durability of concrete 实际工程中的混凝土结构，因侵蚀性介质的存在而使非力学破坏行为无处不在，这些非力学破坏行为包括碱集料反应、硫酸盐侵蚀、碳化、钢筋锈蚀、冻融等，单一的破坏形式或多形式的复合破坏作用对混凝土结构性能及耐久性能均有着较为严重的影响，在很大程度上缩短了建筑物的服役年限，而这些非力学破坏在很大程度上取决于其渗透性，所以测试混凝土渗透性能是研究判断混凝土耐久性的常规必测项目。
The product is produced with high quality magnesia and basic refractory raw material , binder and additive , it has higher corrosion resistance and good thermal shock resistance and can prolong the service life of tundish and is easy to remove its lining , it can be used by mechanical gunning and manual smearing on working site 本产品是采用优质镁砂和碱性复合耐火原料与特殊复合结合剂、添加剂制作而成，该产品具有较高的耐侵蚀性和耐急冷急热性，可以有效的延长中间包的使用寿命，并易于脱包，本产品可现场机械喷涂施工，又可人工涂抹作业。
For example , frp reinforced concrete is used to support or surround magnetic resonance imaging ( mri ) medical equipment , and frp is also used for the constructions of some seawalls , industrial roof decks , base pads for electrical and reactor equipment , anchor in rock and ground engineering and concrete floor slabs in aggressive chemical environments in order to promote the wide usage of frp and frp reinforced concrete structures , financed cooperatively by nationa l natural science foundation ( item : the research on mechanical performance of frp reinforced concrete beam reinforced ; number : 59978046 ) and henan illustrious youth science foundation , connected with the analysis methods of modern steel reinforced concrete structure , the thesis further studies the flexural performance of frp reinforced concrete beam through the systematic study on experimental data got from this kind of beams , systematically establishes the theoretical calculating system of the flexural performance of frp reinforced concrete beam in cooperation with the up - to - date analytical methods for reinforced concrete , which suits the properties of frp 例如，纤维增强塑料筋应用于支撑和围绕磁共振成像医疗设备的混凝土中及海堤、工业顶棚、电设备、反应设备的基座、岩土工程中的锚杆、侵蚀性环境的混凝土结构等海洋工程、桥梁工程、路面工程、岩土工程、医疗及化工工程的建设。为了推动纤维增强塑料筋及其混凝土结构在工程中的广泛应用，本文在国家自然科学基金(项目名称：纤维增强塑料筋混凝土梁力学性能的研究；编号： 59978046 )和河南省杰出青年基金的资助下，通过对纤维增强塑料筋混凝土梁正截面受弯性能试验数据的系统分析，结合现代钢筋混凝土结构学的分析方法，对纤维增强塑料筋混凝土梁正截面受弯性能进行了深入的研究，较系统的建立了适合于纤维增强塑料筋特点的纤维增强塑料筋混凝土梁正截面受弯性能的理论计算体系。
They have excellent corrosion , thermal shock resistance and spalling resistance . they wide applications and can be used in key locations of thermal processing equipment such as bof , eaf , lf and so on . 2 alumina - magnesia - carbon brick made from high - purity bauxite or fused alumina and fused magnesia grain or high purity magnesia by pressing , resin - bond for thermal shock resistance 1 ，镁碳砖是不烧的耐火材料，经过摩擦压砖机的成型以及干燥处理后而成,它的主要原料是电熔镁，高纯镁砂和高纯石墨，结合剂为树脂,镁碳砖有良好的耐侵蚀性，热震稳定性和抗剥落性，它已经被广泛地用在钢厂的转炉电炉钢包精炼钢包等关键部位。
The proportion of plastic shrinkage cracking is rather high in early cracking . the plastic shrinkage cracking would effect construction appearance and promote the propagation of drying shrinkage cracking or other types cracking , but also provide a passage for aggressive agents penetrating and moving to the concrete mass 塑性收缩裂缝在早期裂缝中占有相当大的比重，其存在不仅影响工程外观，促使干燥收缩裂缝或其它形式裂缝的发展，而且还将为侵蚀性介质向混凝土基体渗透、迁移提供通道，对混凝土的耐久性造成严重影响。
This paper used the reactive powder concrete ( rpc ) as the inorganic anchoring material , and studied this material ’ s compositions and the materials mechanics properties ( mainly includes compressive strength , shearing strength , elasticity coefficient and poisson ' s ratio ) , and also studied the contraction , durability ( including the rpc permeability , chemistry corrosiveness and anti - frozen performance ) and the heat - resistance of rpc 本文采用活性粉末混凝土( rpc )为无机锚固材料,并对该材料的配合比,材料力学性能(主要包括抗压强度,抗剪强度,弹性模量和泊松比)进行研究,还分析了rpc的收缩性、耐久性能(包括rpc的渗透性、化学侵蚀性和抗冻性能)和耐高温性能。
