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传统的钢筋水泥混凝土在天气、环境的影响下,会因为受冻而产生裂痕,导致钢架结构的房子不牢固,容易发生意外倒塌事件。因此,在我国北方寒冷的地区,为了提高混凝土的抗裂性和加强混凝土的强度,从而可以延长工地在寒冷气候下的工作实践,常常会在混凝土中添加防冻液或者防冻剂,另外也会根据气温气候添加早强剂。其中,这些防冻液、防冻剂、早强剂的主要成分通常为盐类,常见的无机盐类有硫酸盐(SO_4~(2-))、硝酸盐(NO_3~-)、亚硝酸盐(HNO_2~-)以及氯盐(Cl~-)等,常见的有机盐类有甲酸钙(C_2H_2O_4Ca)、乙酸钙(Ca(CH_3COO)_2)、三乙醇胺((2-羟乙基)胺)等。在实践操作中,通过现象表明,在寒冷地区,在混泥土中添加防冻液、防冻剂、早强剂能够有效防止混泥土的耐寒强度,但是任何东西有利有弊,在有效预耐冻性的时候,又加剧了混凝土早期自收缩及抗裂性。基于此,文章主要针对几种无机盐和有机盐对混凝土早期收缩以及抗裂性能的影响进行研究和探讨,为实际工程建筑过程中提供有效的解决方案和指导。
Traditional reinforced concrete under the influence of the weather and the environment will be cracked due to freezing and thawing, resulting in the steel structure of the house is not solid, prone to accidental collapse. Therefore, in the cold northern areas of our country, in order to improve the crack resistance of concrete and strengthen the strength of concrete, which can extend the site in cold weather practice, often adding antifreeze or antifreeze concrete, in addition to Add early strength agent climate temperature. Among them, the main components of these antifreeze, antifreeze and early strength agent are usually salts, common inorganic salts include sulfate (SO 4 2-), nitrate (NO 3 -), nitrite (HNO 2 ~ (-)) and chloride salts (Cl ~ -). Common organic salts include calcium formate (C_2H_2O_4Ca), calcium acetate (Ca_ (CH_3COO) _2) and triethanolamine (2-hydroxyethyl) amine. In practice, the phenomenon shows that in cold areas, the addition of antifreeze in the concrete, antifreeze, early strength agent can effectively prevent the concrete cold hardiness, but anything has advantages and disadvantages, in the effective pre-freezing resistance Time, but also exacerbated the early self-shrinkage and cracking of concrete. Based on this, the article focuses on the effects of several inorganic salts and organic salts on early shrinkage and cracking resistance of concrete, and provides effective solutions and guidance for the actual engineering construction.