Standard for testing the freeze resistance of insulating material for housing water supply pipe 住宅建筑给水管道保温材料防冻性能测试标准
Studies on the Technic of Identification for Freeze Resistance in Sugarcane 甘蔗品种抗寒性鉴定技术研究
The freeze resistance of sand mortar test sample treated by SAR synthesized in situ under saturate water state is greatly improved than standard sand mortar. 用原位合成高吸水性树脂处理的砂浆试件,饱水状态下其抗冻能力较基准砂浆有较大改善。
Study on freeze resistance of unburned brick produced by solidified mud in oil field 利用油田污泥固化生产免烧砖的抗冻性研究
Some properties of PHMS/ BA composite emulsion were characterized: the resistance to electrolyte, to alkali, acid fastness, centrifugal stability and heat resistance, and freeze resistance. 研究了PHMS/BA复合乳液的耐电解质稳定性、耐酸碱稳定性、离心稳定性以及耐热耐寒性。
The corrosion resistance and freeze/ thaw resistance of alkali-activated cement are much better, and the drying shrinkage rate is much greater than ordinary portland cement. 碱–磷渣–粉煤灰胶凝材料的耐蚀性和抗冻性能均显著优于硅酸盐水泥,其干缩比硅酸盐水泥的大。
Hereditary property and classification of pre-selection plants of Armeniaca sibirica such as abundant bearing, late florescence, freeze resistance and sweet almond were studied with PAGE ( polyacrylamide gelelectrophoresis) of leaf peroxidase isoenzyme and seed soluble protein. 应用叶片POD同工酶和种子可溶性蛋白PAGE技术,研究丰产、晚花、抗冻和甜仁山杏初选优株的遗传特性及分类,结果表明,60%以上的优株具有可遗传性;
The experiment result come out that the compound additive is in favor of the enhancement of the strength and is helpful to the improvement of the anti-permeability and the freeze resistance of the concrete. 实验结果表明,复合型外加剂有利于混凝土的强度发挥,并有利于混凝土的抗渗性、抗冻性的提高。
To demonstrate the feasibility of increasing the durability of concrete pavement by incorporating polypropylene ( PP) fibers, indoor tests were made to study the effects of different fiber volumes on the freeze resistance and crack resistance of the pavement. index; 为了验证掺入聚丙烯纤维的方法提高混凝土路面耐久性指标的可行性,进行了聚丙烯纤维混凝土路面耐久性的室内试验研究,探讨了不同纤维体积掺量对混凝土路面抗冻性和抗裂性的影响。
The surface of the cement concrete pavement is destroyed seriously in the cold areas of northern China, the damage of freeze thaw and de-icing salt by frosting resistance test is analysed, the performance of concrete with different kinds of concrete additives has been studied. 从寒冷地区水泥混凝土路面的表面类破坏出发,对混凝土的冻融破坏和盐剥蚀破坏进行了分析,并通过抗冻性试验对掺不同外加剂的混凝土进行了研究。
Canopy growth character, economic characters of nut, powdery mildew resistance, anti-sprouting and living through the winter, freeze injury resistance and productivity in 20 walnut cultivars or clones introduced from domestic had been observed and researched for 7 years in Qingshui County, Gansu province. 对从国内各地引入清水地区的20个核桃品种(系)的树体特性、坚果经济性状、抗白粉病、抗越冬抽条、抗冻害特性和丰产性进行了7a的观察研究。
To improve polyvinylacetate ( PVAc) emulsion adhesive the failing of bad water-resistance, heat-resistance, freeze-resistance and emulsion stability, large creep and low bonding strength. 为了改善聚醋酸乙烯乳液胶粘剂的耐水性、耐热性、耐寒性和乳液稳定性差,蠕变性大及粘接强度低的缺点。
Compared with the single factor of freeze/ thaw cycle, the frost resistance of concrete is appreciably improved, due to improved pore structure by ASR. 与单因素冻融作用相比,经过4周ASR结束时混凝土孔结构得到优化,混凝土抗冻性得到了明显改善。
Influences of Chinese herbal additive on semen freeze resistance for pigs 中草药添加剂对猪精液耐冻性的影响
The milk-white glue which was gained under the best operation conditions has characteristics of water resistance, freeze resistance, stability and shear strength. 在最优试验条件下所获乳白胶具有耐水、耐寒、胶液稳定、抗剪强度高等特点。
The preparation of vinyl acetate& acrylic acid copolymer emulsion is introduced, It uses for lamination of paper aluminum foil, and has high bond, rapid dry, good freeze resistance etc. 介绍了一种通过加入少量丙烯酸共聚改性的醋酸乙烯酯乳液的制备方法,该胶用于纸-铝箔的复合粘接,具有粘接力强、快干、抗冻性优良等特点。
The change in microstructure of coarse-aggregate after cycling of freeze and thaw is less, the frost resistance is higher; 粗集料冻融前后的孔隙结构变化越小,其抗冻性能就越好;
The research achievements and application on the plants freeze resistance were concisely discussed. 简介了植物抗寒冻性方面的研究成果及其应用。
Comparative research on protein production capacity and freeze resistance capability of duckweed in nitrogen-phosphorus wastewater purification 浮萍净化氮磷污水的蛋白质生产能力及耐寒能力比较研究
It can enhance freeze resistance of compacted concrete that enlarging fly ash and cementing material content in concrete to lower w/ c ratio; 在碾压混凝土中增加粉煤灰的用量,提高胶凝材料的总量,从而降低混凝土的水灰比,能提高碾压混凝土抗冻性;
Freeze& Thaw Resistance of Class I Fly Ash Concrete Ⅰ级粉煤灰混凝土的抗冻融性能
Freeze thaw resistance and air-void characteristics of high strength concrete with silica fume Studies on advanced characters silic power concrete 高强硅粉混凝土抗冻性及气泡结构的试验研究高性能硅粉混凝土的探讨
P ( VAC-MMA) emulsion shows better freeze resistance and wider range of PH as well as better water-resistance than that of PVAC emulsion. 结果表明,所得P(VAC-MMA)乳液的耐水性、防冻性及PH值适应范围较PVAC均聚物乳液均有所改善。
The small hollow concrete block using expanded perlite as aggregate has many advantages as follows: high volume density and small thermal conductivity, excellent thermal insulation and sound insulation properties, high monolithic strength, less dry shrinkage and good freeze resistance. 用膨胀珍珠岩作集料制成的混凝土小型空心砌块的体积密度和导热系数小,具有良好的保温、隔热、隔音的特性,而且整体强度高,干燥收缩小,抗冻性能好。
Study Progress on Freeze-resistance of Banana 香蕉抗寒性的研究进展
Research results demonstrate that this consolidation technology can make the pressure of municipal wastes consolidates reach more than 38 MPa. And the consolidates durability is better, such as resistance of freeze and thaw, resistance of water, resistance of dry-wet circle and resistance of sulfate erode. 研究结果表明:本固结技术可使生活垃圾固结体28d强度达38MPa以上,其耐久性能诸如抗冻性能、耐水性能、抗干湿循环能力和抗硫酸盐侵蚀性能较为优越。
And the distribution curves of bore is done by method of MIP, according to the fractal theory, the mechanism of the freeze resistance is analyzed. 采用压汞仪测孔方法得到相应孔分布曲线,利用分形理论分析了固化免烧砖的抗冻机理。
Preliminary studies of magnetic water on freeze resistance effect of Wheat Seedlings 磁化水对小麦幼苗抗冻性效应的初步研究
The test results show that under the same volume features ( such as porosity), steel fiber can improve the freeze thaw splitting strength and resistance to water damage property of asphalt concrete effectively. 试验结果表明,在体积特征相同的条件下(如空隙率),加入钢纤维可使基体沥青混凝土具有更高的冻融劈裂强度,从而可有效提高沥青混凝土的抗水损害能力。