混凝土与水泥制品
混凝土與水泥製品
혼응토여수니제품
CHINA CONCRETE AND CEMENT PRODUCTS
2015年
6期
1-5
,共5页
刘素瑞%杨久俊%王战忠%张磊%荣辉
劉素瑞%楊久俊%王戰忠%張磊%榮輝
류소서%양구준%왕전충%장뢰%영휘
碳酸钠溶液%混凝土%自愈合%强度恢复率%裂缝宽度愈合率
碳痠鈉溶液%混凝土%自愈閤%彊度恢複率%裂縫寬度愈閤率
탄산납용액%혼응토%자유합%강도회복솔%렬봉관도유합솔
Sodium carbonate solution%Concrete%Self-healing%Strength restoration ratio%Crack width healing ratio
通过分析混凝土裂缝愈合前后的力学性能、裂缝宽度、物相组成和组织结构,研究了不同浓度Na2CO3溶液(0、2%、4%、6%)环境下混凝土裂缝的自愈合性能。结果表明,Na2CO3溶液对混凝土裂缝的自愈合效果明显优于水；不同浓度Na2CO3溶液环境下,混凝土的强度、波速均随龄期延长逐渐增大,且增长速率前期较大,后随龄期的延长趋于平缓；6%Na2CO3溶液环境下,混凝土强度恢复效果最明显,49d时完全恢复,60d时强度恢复率增至106.1%；2%Na2CO3溶液环境下,60d时混凝土强度恢复率仅为73.5%；4%Na2CO3溶液环境下,混凝土强度恢复效果处于两者之间。随Na2CO3溶液浓度的增大,裂缝中C- S- H凝胶、CaCO3晶体等水化产物增多,体积增大,二者通过填充作用和胶结作用,使裂缝逐渐愈合。
通過分析混凝土裂縫愈閤前後的力學性能、裂縫寬度、物相組成和組織結構,研究瞭不同濃度Na2CO3溶液(0、2%、4%、6%)環境下混凝土裂縫的自愈閤性能。結果錶明,Na2CO3溶液對混凝土裂縫的自愈閤效果明顯優于水；不同濃度Na2CO3溶液環境下,混凝土的彊度、波速均隨齡期延長逐漸增大,且增長速率前期較大,後隨齡期的延長趨于平緩；6%Na2CO3溶液環境下,混凝土彊度恢複效果最明顯,49d時完全恢複,60d時彊度恢複率增至106.1%；2%Na2CO3溶液環境下,60d時混凝土彊度恢複率僅為73.5%；4%Na2CO3溶液環境下,混凝土彊度恢複效果處于兩者之間。隨Na2CO3溶液濃度的增大,裂縫中C- S- H凝膠、CaCO3晶體等水化產物增多,體積增大,二者通過填充作用和膠結作用,使裂縫逐漸愈閤。
통과분석혼응토렬봉유합전후적역학성능、렬봉관도、물상조성화조직결구,연구료불동농도Na2CO3용액(0、2%、4%、6%)배경하혼응토렬봉적자유합성능。결과표명,Na2CO3용액대혼응토렬봉적자유합효과명현우우수；불동농도Na2CO3용액배경하,혼응토적강도、파속균수령기연장축점증대,차증장속솔전기교대,후수령기적연장추우평완；6%Na2CO3용액배경하,혼응토강도회복효과최명현,49d시완전회복,60d시강도회복솔증지106.1%；2%Na2CO3용액배경하,60d시혼응토강도회복솔부위73.5%；4%Na2CO3용액배경하,혼응토강도회복효과처우량자지간。수Na2CO3용액농도적증대,렬봉중C- S- H응효、CaCO3정체등수화산물증다,체적증대,이자통과전충작용화효결작용,사렬봉축점유합。
Concrete self-healing performances under different concentration of sodium carbonate solution(0,2%,4%, 6%) were studied by analyzing mechanical property, crack width, phase composition and microstructure before and after the repairment of concrete crack. The experimental results indicated that the self-healing capacity of concrete curing in sodium carbonate solution was much better than that of concrete curing in water. In different concentrations of sodium car-bonate solution, the early rising rate of strength and ultrasonic velocity of concrete sample was high, along with the prolon-gation of curing age, the rising rate of strength and ultrasonic velocity leveled off. Concrete curing in the 6% sodium car-bonate solution showed the best self-healing performance and its compressive strength recovered completely in the curing age of 49 days, and the strength restoration ratio was 106.1% in the curing age of 60 days. The strength restoration ratio of concrete curing in 2%sodium carbonate solution was only 73.5% in the curing age of 60 days. 4% sodium carbonate solu-tion showed a middle self-healing performance. The amount and size of hydration products, such as C-S-H gel and calci-um carbonate, increased with the increase of sodium carbonate solution concentration. These hydration products made the crack healed gradually through filling action and cementation action.
