超高韧性水泥基复合材料碳化与渗透性能试验研究
Experimental studies on permeability and carbonation properties of ultra high toughness cementitious composites
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摘要: 对超高韧性水泥基复合材料(UHTCC) 进行了快速碳化、预裂后的快速碳化、渗透性、快速氯离子渗透试验及自由氯离子含量测定, 研究了不同龄期UHTCC 的抗碳化性能和渗透性能。试验结果表明, 在无裂缝状态下, UHTCC 的抗碳化性能与同强度普通混凝土相当, 但在相同荷载预裂后, UHTCC 裂缝处的碳化深度仅为对比混凝土的30 %～40 %; UHTCC 抗渗性能优于同强度普通混凝土, 且随着龄期增长优势更明显, 56 天龄期的渗透系数约为对比混凝土的35 %; 快速氯离子试验和自由氯离子含量测定得到的氯离子渗透系数均表明, UHTCC 具有明显优于普通混凝土的抵抗氯离子渗透性能。Abstract: The carbonation and permeability properties of ultra high toughness cementitious composites (UHTCC) were investigated through the rapid carbonation test with and without pre-loading, permeability, rapid chloride ions migration test and measurement of free chloride ions. The results show that the carbonation depth of UHTCC is equal to that of the controlled concrete, but the carbonation depth of UHTCC with pre-loading is only 30 %～40 % of the controlled concrete. The impermeability of UHTCC is superior to that of controlled concrete. The permeability coefficient of UHTCC decreases with age increasing, which is 35 % of the controlled concrete when the age was up to 56 days. Rapid chloride ions migration test and measurement of free chloride ions reveal that UHTCC is much better than the concrete in resisting chloride ions penetration.
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Key words:
- ultra high toughness /
- cementitious composite /
- carbonation /
- permeability /
- chloride ions diffusion
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