In the concrete test cubes damages under freeze thaw cycles , the theory of the frost damages is explained and freeze - thaw test is done . from test results , the thesis analyzes the main reasons of frost damages 在冻融作用下混凝土试件的损伤部分中，首先阐述了混凝土的冻害机理，然后进行混凝土的抗冻试验，通过试验结果分析影响混凝土抗冻性的主要因素。
In this paper , the roles of dehydrins and cbf1 transcription factor were studied in plants under low temperature and dehydration condition , and their possible mechanisms in the development of freezing and drought tolerance were also discussed 本文以植物脱水蛋白和冷诱导转录因子cbf1基因为主要研究对象，探讨它们在低温和干旱胁迫中对植物抗冻性和抗旱性形成的作用。
The cold resistance and the water permeability resistance of the recycled coarse aggregate concrete were also test . the principle and the influencing factors of the drying shrinkage , the freeze thaw action and the water permeation action of the recycled coarse aggregate concrete were briefly narrated 还测试了再生粗骨料混凝土的抗冻性和抗渗性，简要叙述了再生粗骨料混凝土干缩变形、冻融作用、渗透作用的机理以及影响因素。
Based on the study result , the paper has made a systematic study on the compounding and performance of binding mortar . compared with tradition binding mortar , this new type binding mortar has better performance of water resistance , frost resistance and crack resistance , etc 研究结果表明，新型粘结砂浆具有比传统粘结砂浆更优良的性能：和易性改善，粘接强度、耐水性以及抗裂性显著提高，抗冻性良好，从而保证了新型粘结砂浆具有良好的耐候性。
Comparing with the reference concrete , the resistance of freezing - thawing cycles and chloride diffusivity in calcium - enriched fly ash concrete increase , because the pore structures and interface structure are optimized , so the durability of calcium - enriched fly ash concrete is perfect 相对于基准混凝土,增钙粉煤灰混凝土的抗冻性和抗氯离子渗透性能均有所提升,这主要是由于增钙粉煤灰改善了混凝土的孔结构和界面结构,从而使其具有更为优异的耐久性。
The research of high performance pavement concrete ( hppc ) is done in two sides . one is mixture design , the other is pavement performance . the mixture design and design flowchart of hppc is given on the base of nc with the consideration of characteristic of both hppc and nc . the grow law , influencing factor and formation mechanism of hppc strength is analisised by perpendicular experiment . in the same , the fatigue equations are set up for hppc and hppc i on the base of fatigue experiment . the fatigue mechanism of hppc is analysised by damage mechanics and fracture mechanics . brittleness , frost resistance and abrasion resistance of hppc is researched with the camparition to nc i . at last , the economic analysis of hppc is done by two kinds of way 结合高性能混凝土与普通路面混凝土的特点，提出了建立在普通路面混凝土基础上的高性能路面混凝土配合比设计方法，给出了设计流程；通过正交试验(强度试验) ，分析了高性能路面混凝土的强度发展规律、影响因素与形成机理；同时，根据疲劳试验结果采用双参数weibull分布模型分别建立了高性能路面混凝土和高性能路面混凝土(没有掺加硅粉)疲劳方程，应用损伤力学和断裂力学，分析了高性能路面混凝土的疲劳机理；并采用了对比分析方法，研究了高性能路面混凝土的脆性、抗冻性和耐磨性等。
The concrete ’ s anti - frozen can reflect concrete ’ s synthesis durability in the certain degree . this paper changed the former research mentality which enhanced concrete anti - frozen to use an extra material , aimed at the inner mongolian characteristic , utilized compound cement substituted ordinary portland cement , mixed the dula - fiber , the grade 2 inner mongolian pulverized coal ash , the extra material that was highly effective reduces the quantity of water outside the concrete to improve the concrete ’ s main performance , especially the concrete ’ s anti - frozen 混凝土抗冻性在一定程度上能够反映混凝土的综合耐久性能,本论文改变以往提高混凝土抗冻性只采用一种外掺料的单一研究思路,针对内蒙古地区特点,运用复合水泥取代普通硅酸盐水泥,在混凝土中掺入杜拉纤维、内蒙2级粉煤灰、荼系高效减水剂三种外掺料,来提高混凝土的主要性能,尤其是混凝土的抗冻性。
I . roles of dehydrins in plant tolerance to freezing and drought . accumulations of heat - stable proteins and dehydrins induced by dehydration , low temperature , osmotic stress , high salt or aba treatment were investigated in protocorm - like - bodies ( plbs ) ofdendrobium candidum . moreover , we described the relationship between these accumulations and the development of tolerance to stresses 一、脱水蛋白对植物抗冻性和抗旱性作用研究以铁皮石斛类原球茎( plbs )为材料，研究脱水、低温、高渗、高盐和外源aba处理与诱导热稳定蛋白和脱水蛋白的关系，以及胁迫诱导蛋白的积累与各种抗逆性形成的相关性。
We built a test road and after one year , we used surface wave exploration to test . the result is that the repaired layer felt old road well and have no empty spot . we used the pendulum friction tested and the results are the wear - resisting property is better than cement concrete pavement and pendulum friction is higher than cement concrete pavement 此种材料同原有水泥混凝土路面的粘结性能强，强度上升快，韧性大，抗冻性好，防水抗渗；通过试验路运营一年多的检测结果表明：通过面波仪测定修补层与原路面粘结良好，没有脱空点；利用摆式摩擦仪测定其耐摩耗性能优于原水泥混凝土路面。
Polypropylene fiber reinforced concrete ( ppfrc ) , steel fiber reinforced concrete ( sfrc ) and mixed fiber reinforced concrete used in plate of bridge are studied . the performances of concrete with different fiber content , such as compression strength , tension strength , splitting tensile strength , frost resistance , shrinkage , early shrinkage and chloride ion diffusion coefficient ( dcl - ) are studied 分别研究了改性聚丙烯纤维、钢纤维和混掺纤维对桥面板用混凝土性能的影响,研究了不同纤维掺量混凝土的抗压强度、抗折强度、劈裂强度及抗冻性、干缩性能、早期开裂和氯离子扩散系数进行了试验研究。
