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- 混凝土与制品
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蒸养制度对天然火山灰混凝土预制轨枕性能的影响
作者：张兵1，陶元洪2，夏京亮3，关青锋3，周永祥3
（1.中交第四航务工程局有限公司，广州 510290；2.中国路桥工程有限责任公司，北京 100011；
3.中国建筑科学研究院有限公司，北京 100013）
摘要：利用肯尼亚当地天然火山灰等质量取代20%水泥制备C60天然火山灰预制轨枕混凝土，采用单因素试验研究了静养时间、升温速率、恒温温度、恒温时间对天然火山灰预制轨枕混凝土抗压强度的影响。结果表明，延长静养时间可提高混凝土强度；提高升温速率对混凝土早期强度影响较小，对28、56 d强度不利；延长恒温时间和升高恒温温度均可提高3 d抗压强度，但会降低28、56 d抗压强度。天然火山灰轨枕混凝土的最优蒸养制度为：静养时间3~4 h、升温速率≤15 ℃/h、恒温时间2~4 h、恒温温度50~60 ℃，此时混凝土的3、28、56 d抗压强度分别为64.7、82.9、84.5 MPa。
关键词：天然火山灰；蒸汽养护；预制轨枕；力学性能
中图分类号：TU528.31 文献标识码：A 文章编号：1001-702X（2022）05-0088-04
Influence of steam-curing system on precast concrete sleeper prepared with natural pozzolan
ZHANG Bing1，TAO Yuanhong2，XIA Jingliang3，GUAN Qingfeng3，ZHOU Yongxiang3
（1.CCCC Fourth Navigation Engineering Bureau Co. Ltd.，Guangzhou 510290，China；2.China Road and Bridge Engineering Co. Ltd.，Beijing 100013，China；3.China Academy of Building Research，Beijing 100013，China）
Abstract：This article used Kenya natural volcanic ash as a 20% replacement of cement to prepare C60 concrete for producing prefabricated sleepers. The effects of resting time，heating rate，constant temperature，and constant temperature time on the compressive strength of natural pozzolanic concrete were studied by single-factor experiments. The results showed that prolonging the resting time can improve the strength of concrete; increasing the heating rate had little effect on the early strength of concrete，which was unfavorable for the strength of 28 d and 56 d， increasing the constant temperature time and temperature can increase the 3 d strength but reduce the strength of 28 d and 56 d. The optimal steam curing system of natural pozzolanic sleeper concrete is： resting time 3~4 h，heating rate ≤15 ℃/h，constant temperature time 2~4 h，constant temperature 50~60 ℃，and the 3，28，56 d compressive strength of concrete under these conditions were 64.7，82.9，and 84.5 MPa，respectively.
Key words：natural volcanic ash，steam curing，precast sleeper，mechanical properties