Abstract : measures for improving freezing - thawing resisting durability of concrete for marine ( harbor ) engineering were presented , especially the effect of bubbling additive was analyzed 文摘:阐述了提高混凝土抗冻融耐久性的措施，分析了引气剂对提高混凝土抗冻融的效果及其影响因素。
The effect of admixture on impermeability of concrete in frigid zone was studied the results of the test meet the requirements of design and construction 摘要主要研究了混凝土中掺入引气减水剂对混凝土抗渗性能的影响，并按选定配比以最佳掺入量掺入混凝土中进行抗渗试验，测试的结果满足设计和施工的要求。
The application research of water - soluble polymer in concrete admixtures , in which including water - reducer , air - entraining agent , shrinkage - reducing agent , anti - washout admixture and corrosion inhibitors were summarized 摘要综述了水性高分子材料在混凝土外加剂中的研究及应用情况，其中包括减水剂、引气剂、减缩剂、水下不分散剂及阻锈剂等。
The problem of the reinforcement corrosion has already drawn the wide attention of the academic circles , and has been conducted the massive research . however the reinforcement corrosion of air - entrained concrete has not been taken into the systematic research 国内外学者对普通钢筋混凝土进行了大量研究,得出了很多重要的结论,但对引气混凝土的抗钢筋锈蚀性能研究则较少。
Mechanical performance , frost resistance and abrasion resistance of concrete with fly ash , air entraining agent and four kinds of inorganic salts including sodium sulfate , sodium nitrite , calcium nitrite and sodium chloride are mainly studied in this paper 本文研究了在路面水泥混凝土中掺入粉煤灰、引气剂和四种无机盐( na2so4 、 nano2 、 ca ( no2 ) 2和nacl )后,混凝土的力学性能、抗盐冻剥蚀能力和耐磨性等性能的变化规律。
The paper discusses mechanism performance , durability and resistance to de - icing salt concrete , this kind of concrete is made with air - entraining agent or silica fume and used in the trial section construction of benxi - dandong freeway ' s charge square which is located in dandong 本文通过在混凝土中掺入引气剂或硅粉，来配制抗除冰盐混凝土，并对其进行力学性能和耐久性测试，重点试验其抵抗盐冻能力，并用于本丹高速公路丹东段的收费广场试验路施工。
Firstly , this paper expounds the research on the physical and chemical performance of pumice and the action of those performance to pumice concrete , and the adaptability of calcium lignosulfonate to pumice concrete , and the influence of air - entrained agent to the performance of pumice concrete 本文首先对浮石的物理、化学性能及其对混凝土的影响进行了系统试验与研究；并进行了减水剂对浮石混凝土的适应性，以及掺加引气剂对浮石混凝土性能的影响的分析研究。
Based on the theory of shrinkage , capillary force theory , the influence of road concrete additives in common use on surface tension of water is studied , and the results show that the influence of water reducer is very small whereas shrinkage - reducing agent and air entrainer can reduce surface tension of solution significantly . the relation between surface tension and additive dosage are non - linear relation . each additive has an obvious critical micelle concentration ( cmc ) 从混凝土收缩的基本理论? ?毛细管张力理论出发,通过道路混凝土外加剂对水的表面张力的影响研究发现,减水剂对水的表面张力的影响很小,而减缩剂和引气剂可以大幅度降低溶液的表面张力,溶液的表面张力随外加剂的掺量呈非线性形式降低,而且都存在临界胶束浓度。
This paper unfolds engineering disposition and theoretical research of negative temperature high performance concrete ( nthpc ) with the damage of many factors motivation , the project background based on qing - zang railway engineering , which is one of four - emphasized engineering during the tenth five - plan . due to the difference of environment of construction and service between nthpc and ordinary concrete , and therefore durability of nthpc is required to higher level . at a first , nthpc must avoid frozen damage at early age and possess anti - freezing property at later period , in order to meet engineering practicable application need , and this are two emphasized and difficult problems , as for nthpc ; by means of mechanism analysis about deicing - agent ingredient and anti - freezing at early period , adopting composite technique routine of mineral addition + anti - freezing element + water - reducer4 - air - entraining + anti - erosion of steel component etc , based on orthogonal experimental approach , fd - 1 composite functional admixtu re was manufactured , which has more property and orientation on qing - zang railway 负温混凝土由于和普通混凝土在施工环境及服役环境上存在的差异，因此表现为比普通混凝土更为较高的耐久性要求；负温混凝土首先要避免早期的冻害以及具备长期抗冻性能，才能够满足工程实际应用的要求，这也是负温混凝土必须解决的两大技术关键；通过对目前常用防冻剂组分作用机理的分析研究及混凝土早期防冻机理探讨，采用矿物外加剂+防冻组分+高效减水剂+引气+阻锈组分功能复合的技术路线，通过正交试验设计复配了适应青藏铁路工程要求的专用多功能复合型外加剂fd - 1 ；并在此基础上配制不同等级负温高性能混凝土，开展一系列包括硫酸盐侵蚀、氯离子渗透、抗冻融循环、收缩及耐磨性等耐久性能研究；通过对fd - 1组分和掺量的调整，优化负温混凝土在施工特性、力学指标和耐久性三个方面的兼容、协调性。
Vibration viscosity coefficient of fresh concrete with additives and mineral admixtures are tested . the results show that water reducer and air entrainer can reduce vibration viscosity coefficient while shrinkage - reducing agent has very small influence on it . proper quantity of citric acid , sodium glucaonate or carboxymethy cellulose can reduce vibration viscosity coefficient of fresh concrete 通过对选定的引气剂和减缩剂对硬化混凝土的收缩性能的影响研究发现,引气剂和减缩剂可以大幅度降低混凝土毛细孔中溶液的表面张力,对降低混凝土收缩具有显著作用,当二者复掺时,减缩效果更为明显。
