不同矿物掺合料对RPC保护层厚度的影响分析  

Influence of various mineral admixtures on the RPC-cover thickness

作　　者：唐爱华[1] 王尚伟[1] 曹霞[1] 金凌志[1] 赵胜华[1] 

机构地区：[1]桂林理工大学广西岩土力学与工程重点实验室,广西桂林541004

出　　处：《广西大学学报（自然科学版）》2014年第4期913-919,共7页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(51368013);广西科技攻关项目(桂科攻0995004);广西矿冶与环境科学实验中心资助课题(KH2013ZD008)

摘　　要：为研究不同矿物细掺合料对活性粉末混凝土耐久性的影响,采用NEL法(电导法)比较硅灰和粉煤灰双掺、硅灰和石英粉双掺、硅灰和粉煤灰及石英粉互掺、硅灰和硅微粉双掺共四组RPC(活性粉末混凝土)不同的抗氯离子系数,然后用菲克第二定律计算出不同配合比、不同使用年限的保护层厚度。研究结果表明,在同一设计年限内,硅灰和粉煤灰双掺所需要的保护层厚度最低,同比例的硅灰和硅微粉双掺效果最差;用粉煤灰取代40%的硅灰50年、100年、150年龄期的保护层厚度分别为50 mm、70 mm、86 mm,相对于其他三组矿物掺合料能有效的降低保护层厚度。说明粉煤灰取代硅灰用于RPC耐久性设计的效果最好。In order to study the effects of different mineral fine admixture on the durability of reac-tive powder concrete （RPC）, NEL （Nernst-Einstein） method was used to compare the chloride-re-sistance coefficient of the four groups of RPC doubly-mixed with fly ash and silica fume, quartz pow-der and silica fume, silicon powder and silica fume, and triply-mixed with fly ash, quartz powder and silica fume, respectively. Then, the Second Fick’s Law was used to calculate the cover thick-ness under different mixture proportion and service life. It is concluded by experiment and calcula-tion that the group RPC of fly ash and silica fume is the best for the same design life, and it needs the lowest cover thickness for the same rate. The poorest group is the RPC doubly-mixed with the silicon powder and silica fume. The cover thickness are respectively 50 mm, 70 mm, 86 mm when the design lives are 50 years, 100 years, 150 years ,and 40% of silica fume is replaced by fly ash-the cover thickness is effectively decreased compared with the other 3 groups. Fly ash is the best choice to replace quartz powder for the design life of RPC.

关 键 词：活性粉末混凝土 矿物细掺合料 耐久性 保护层厚度 

分 类 号：TU528.041[建筑科学—建筑技术科学]