摘要
研究含气量、防冻组分对混凝土临界强度的影响,通过冻融循环、氯离子渗透性能及碳化性能表征混凝土耐久性。结果表明:含气量越高,混凝土达到临界强度时间越短,临界强度值越低;防冻组分对混凝土低温环境下强度发展具有促进作用;达到临界强度后,掺防冻组分试样抗冻等级、氯离子渗透性及碳化性能与标准试样相当,分别为F200、570 C及3.4 mm,不掺防冻组分试样耐久性能显著劣化。防冻组分加快了水化反应进程,尤其在负温环境中养护时,水化程度显著加深。
The influence of different air content and antifreeze components on the critical strength of concrete was researched. And the durability of concrete was characterized by freeze-thaw cycles,chloride ion permeability properties and carbonation. The results showed that: the higher the air content was,the shorter time-achieve concrete critical strength was,the lower threshold intensity value was. Antifreeze component promoted the concrete strength development under low temperature environment. After reaching the critical strength,freeze-thaw cycles,chloride ion permeability and carbonation properties of mixed with antifreeze component sample were comparable to standard sample,respectively F200,570 C and 3. 4 mm. The durability of sample without antifreeze was significantly deteriorated. Antifreeze components accelerated hydration reaction process. Especially,for the conservation under the negative temperature environment,hydration degree significantly increased deepened.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2016年第10期3307-3313,共7页
Bulletin of the Chinese Ceramic Society
关键词
冬期施工
临界强度
耐久性能
水化机理
winter construction
critical strength
durability
hydration mechanism
