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首页 > 过刊浏览>2016年第38卷第1期 >40-45. DOI:10.11835/j.issn.1674-4764.2016.01.006
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未水化水泥颗粒后期水化对UHPC性能的影响
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国家自然科学基金(5143000266)


Effect of rehydration of unhydrated cement on ultra high performance concrete
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National Natural Science Foundation of China (No.5143000266)

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    摘要:

    采用高温加速试验,并结合烧失量法、力学试验、测长法、电通量法、碳化等手段研究了不同养护温度和水胶比条件下未水化水泥颗粒后期水化对UHPC性能的影响。结果表明:60℃水养护能够有效加速UHPC中未水化水泥颗粒的后期水化,试块的结合水量在90d内趋于稳定。随养护龄期的增长,UHPC试块先收缩后膨胀,90d的抗折强度、抗氯离子渗透性和抗碳化性能均下降,抗压强度尚无明显损失。水胶比越低,UHPC试块90d的结合水量增长率越大,膨胀值越大,抗折强度损失率也越高。

    Abstract:

    The accelerated high-temperature test was carried out to understand the influence of rehydration of unhydrated cement under different curing temperature and W/B on the performance of ultra high performance concrete(UHPC) with the test of loss on ignition method,mechanic performance, deformation test, RCM and carbonation test. The results show that the rehydration of unhydrated cement in UHPC could be accelerated effectively when the curing temperature was 60 ℃.The bound water content was stable in 90 d. With the increase of age, UHPC would first shrink and then expanse. It would have a downside on the development of its performance in 90 d, such as flexural strength, resistance to chloride ion permeability and carbonation resistance. There was no obvious change of compressive strength. Moreover, the lower W/B, the higher increased percentage of bound water content of UHPC in 90 d, the greater expansion value, and the higher the flexural strength loss rate.

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葛晓丽,刘加平,王育江,田倩,沈江平.未水化水泥颗粒后期水化对UHPC性能的影响[J].土木与环境工程学报（中英文）,2016,38(1):40-45. Ge Xiaoli, Liu Jiaping, Wang Yujiang, Tian Qian, Shen Jiangping. Effect of rehydration of unhydrated cement on ultra high performance concrete[J]. JOURNAL OF CIVIL AND ENVIRONMENTAL ENGINEERING,2016,38(1):40-45.10.11835/j. issn.1674-4764.2016.01.006

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  • 收稿日期:2015-09-20
  • 在线发布日期: 2016-03-01
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