For the engine with hla ( hydraulic lash adjuster ) , it is important to ensure the full lubrication and to reduce the gas dissolved in oil 采用液压挺杆的发动机，除了确保各个运动部件的高效润滑以外还要尽量减少机油中的含气量。
It can not only remove gas , water and impurity , but also free carbon , decolor , deacidify , medium loss reducing and resume utilization property of oil to achieve treated oil up to national standard on water content , gas content , ph number and acid number , ect 它不仅能脱气脱水除杂质，而且还具有去除绝缘油中的游离碳脱色除酸降介损的功能，恢复油的使用性能使处理后油中的含水量含气量ph值酸值等均符合国家标准。
This means the saturation degree of concrete is different . by means of analyzing the l9 ( 34 ) orthogonal table , the air content is the chief factor , the second factor is water binder ratio and the third is mineral admixture in both high water pressure and low water pressure . the water saturation degree of concrete in damaging point ( e6 / e0 = 60 % ) can be found by measuring the dynamic modulus of elasticity after six freezing - thawing cycles 采用l9 ( 34 )正交表对水胶比、含气量和掺合料三个因素进行分析,试验结果表明:在自然情况下,影响混凝土水饱和系数的主要因素是水胶比,而影响混凝土在盐溶液中饱和系数的主要因素则是含气量;在水压力作用下,无论压力大小,混凝土水饱和系数的影响次序依次为含气量、水胶比、掺合料。
By using the method of orthogonal table , the water binder ratio , air content and mineral admixtures which affect the saturation degree are analyzed in this paper . meanwhile in freezing and thawing cycle circumstance including water environment and 3 . 5 % nacl liquor , the saturation degree and the saturation rate are also analyzed . moisture content of the concrete is different by varying water pressure 本文采用正交分析方法,研究了自然饱水和压力饱水条件下水胶比、含气量和掺合料三个因素对混凝土饱和系数的影响规律,并研究了混凝土在纯水和3 . 5 % nacl溶液中受冻后饱和系数的变化规律。
Advanced instrument and testing techniques including adopting mercury injection apparatus , specific surface analyses apparatus , porosity - permeability measurement apparatus , isothermal adsorption instrument and drill core flow experiment system , etc . , are also adopted . on the basis of study on gas zoning , known cbm show and its component , generating mechanism of low coal rank cbm are discussed . the author pointed out that generated cbm should consist of primary biogenic methane gas in lignite stage , thermogenic methane gas in long - flame coal to gas / fat coal stage , and deuterogenic biogenic methane gas in coal seam imbedded stage 在本区瓦斯分带、已知煤层气显示及其组分研究基础上，探讨了低煤级煤层气的生成机制，指出生成的煤层气应包括褐煤阶段的原生生物甲烷气、长焰煤?气肥煤阶段的热成因甲烷气和煤层埋藏阶段的次生生物甲烷气三种成因甲烷气体；进而论述了煤储层含气饱和度、临界解吸压力、临储压力比、地解压差等甲烷解吸特征，实测与理论含气量、煤层气资源量与资源丰度等煤储层含气性特征。
And takes the method of passing electricity in wet environment to carry on the reinforcement corrosion acceleration to the reinforced concrete , and uses the linear polarization method to carry on the test to the polarized resistance and corrosion current density of the steel bar flowed through by electricity at different time , analyzing the rule of the change of the reinforcement corrosion parameters , and test the chloride ion diffusion coefficient to evaluate the impermeability of the concrete 本文以不同水灰比、不同含气量、不同引气剂的钢筋混凝土为研究对象,采用湿通电法对钢筋混凝土进行加速锈蚀,同时采用线性极化法对不同通电时间的极化电阻和腐蚀电流密度进行测试,分析锈蚀参数的变化规律,并通过测定cl -扩散系数来评价其抗渗性。
The performance of concrete at the later age ( after 60 days ) is improved when fly ash is added into concrete , and the abrasion resistance of concrete is perfect at 28 days . entraining air into concrete , the compressive strength is reduced but the flexural strength is improved when the air content less than 5 . 5 % 掺粉煤灰混凝土的各项性能在后期( 60d后)均有所改善,其中耐磨性在28d时表现了较好的结果。在混凝土中引气后,混凝土的抗压强度下降较多但抗折强度在适宜的含气量范围内(小于5 . 5 % )有所提高,混凝土的抗冻性显著提高,同时不会降低混凝土的耐磨性。
The result indicates that when the air content of the concrete changes from 1 to 4 percent , the polarized resistance of the identical flow electricity time increases along with the increment of the air content , the corrosion current density reduces along with the increment of air content , the chloride ion diffusion coefficient reduces with the increment of air content ; when air content changes from 4 to 6 percent , the rule of the change of the polarized resistance and corrosion current density happens to be the opposite , the diffusion coefficient of the chloride ion increases along with the increment of air content ; when the air content is 4 percent , the rust - resisting property of concrete is best , and so is the impermeability of the concrete 试验结果表明,混凝土的含气量在1 . 9 % ~ 4 . 2 %变化时,极化电阻随含气量的增大而增大,腐蚀电流密度随含气量的增大而减小, cl -扩散系数随含气量的增大而减小;当含气量在4 . 2 % ~ 6 . 4 %变化时,极化电阻、腐蚀电流密度和cl -扩散系数的变化规律则相反;当含气量为4 . 2 %时,抗钢筋锈蚀性能最佳,抗渗性最好。 cl -扩散系数与钢筋锈蚀参数在一定程度上有着良好的相关性,抗渗性的结果较好地反映了混凝土中钢筋锈蚀的程度,可以用cl -扩散系数评价引气混凝土的抗钢筋锈蚀性能。
Water pressure method can distinguish permeability of concrete with different strength or air content , and penetration length or permeability coefficient has good correlation with chloride ion diffusion coefficient . tension method also can distinguish permeability of different concrete , but it has discreteness compared with water pressure method 通过研究水压法对于不同渗透性混凝土发现:水压法能够较好的区分不同强度、不同含气量的混凝土的渗透性,渗透高度及渗透系数与氯离子扩散系数的相关性较好。
Through manipulating the air content of mixture to control concrete frost resistance is the universal method in projects , but the study on the effect of concrete pore structure change after air entraining to the concrete frost resistance and impermeability is few , the study on the effect of mineral additive to concrete pore structure and durability is even fewer , so carry on this aspect research has significant meaning 通过控制拌合物的含气量来控制混凝土的抗冻融性,是目前工程中普遍采用的方法,但引气后混凝土的孔结构变化及其对抗冻、抗渗等耐久性的影响研究较少,而无机盐类外加剂对混凝土孔结构及其耐久性影响的研究更少,因此开展这方面的研究具有重要意义。
