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通过环氧材料与混凝土低温相容性试验,研究不同环氧材料与混凝土低温相容性的关系。结果表明:(1)由于环氧树脂与混凝土材料线胀系数相差较大,在混凝土上的单独使用,即使其模量很低(如17MPa),也会因低温造成混凝土的破坏;(2)环氧树脂的弹性模量、线性热膨胀系数,以及摊铺厚度是影响这种破坏的主要因素;(3)适当掺加填料(即环氧砂浆)能大大缓解这种低温破坏,以3倍填料为例,当降温相容性系数-Eα小于2937时,该环氧砂浆能通过规范中五次循环的要求;(4)降温相容性系数-Eα适用于纯环氧树脂材料和掺有相同重量比的环氧砂浆材料,此时,Eα越大,破坏机率越大,Eα越小,破坏机率越小。
Through the low temperature compatibility test between epoxy material and concrete, the relationship between low temperature compatibility of different epoxy materials and concrete was studied. The results show that: (1) Due to the large difference between linear expansion coefficients of epoxy resin and concrete, the concrete used alone will cause concrete damage due to low temperature even though its modulus is very low (for example, 17MPa); (2) Epoxy resin’s modulus of elasticity, coefficient of linear thermal expansion and thickness of paving are the main factors that affect the damage. (3) Appropriate addition of filler (ie, epoxy mortar) can greatly alleviate this low temperature damage, with 3 times the filler As an example, when the compatibility coefficient of cooling down-Eα is less than 2937, the epoxy mortar can pass the requirement of five cycles in the specification; (4) Coefficient of cooling compatibility -Eα applies to the pure epoxy resin material mixed with the same Weight ratio of epoxy mortar material, at this time, Eα larger, the greater the probability of failure, Eα smaller, the probability of failure is smaller.