混合料贮存期和含水率对预拌补偿收缩混凝土动态抗压强度影响的试验与分析
Influence of storage period and water content of dry-mixed materials on dynamic compressive strength for ready-mixed shrinkage-compensating concrete
为研究含水率和贮存期对预拌补偿收缩混凝土动态单轴压缩性能的影响，利用直径74 mm变截面分离式Hopkinson压杆试验装置，进行了贮存期3、7、10天与15天和含水率0.5%、1.0%与1.5%的单轴冲击压缩试验，分析了混合料贮存期和含水率对预拌补偿收缩混凝土动态抗压强度和破坏形态的影响。研究结果表明，随着混合料贮存期的延长，动态抗压强度逐渐降低，含水率为0.5%时，贮存期为3、7、10天和15天时强度损失率分别为4.3%、22.2%、33.9%和47.5%；含水率为1.0%时，贮存期为3、7、10和15天时强度损失率分别为11.1%、31.9%、41.6%和57.1%。贮存期相同时，随着含水率的增加，动态抗压强度逐渐降低，贮存期7天时，含水率为0.5%、1.0%和1.5%时强度损失率分别为22.2%、31.9%、和42.6%；贮存期10天时，含水率为0.5%、1.0%和1.5%时强度损失率分别为33.9%、41.6%、和51.5%。随着贮存期的延长，混凝土的破碎程度加剧。
In order to investigate the influence of storage period and water content on dynamic mechanical properties of ready-mixed shrinkage-compensating concrete, the dynamic compression tests in 3 kinds of water contents (0.5%, 1.0% and 1.5%) and 4 kinds of storage periods(3d, 7d, 10d, 15d) have been carried out by Φ74 mm variable cross-section splitting Hopkinson pressure bar apparatus. The influence of water content and storage period on dynamic compressive strength and failure mode for ready-mixed shrinkage-compensating concrete have been analyzed. The result shows that at the same water content, the dynamic compressive strength decreases with the increase of storage period. When the water content is 0.5%, the strength loss rate are 4.3%, 22.2%, 33.9% and 47.5% for the storage period of 3d, 7d, 10d and 15d. When the water content is 1.0%, the strength loss rate are 11.1%, 31.9%, 41.6% and 57.1% for the storage period of 3d, 7d, 10d and 15d. When the storage period is the same, the dynamic compressive strength decreases with the increase of water content. When the storage period is 7d, the strength loss rate are 22.2%, 31.9% and 42.6% for the water content of 0.5%, 1.0% and 1.5%. When the storage period is 10d, the strength loss rate are 33.9%, 41.6% and 51.5% for the water content of 0.5%, 1.0% and 1.5%, respectively. The failure degree tends to be more serious with the increase of storage period at the same water content.
马芹永、张阳阳、马冬冬
水工材料材料科学建筑材料工业
补偿收缩混凝土干拌混合料动态抗压强度贮存期含水率
shrinkage-compensating concretedry-mixed materialsdynamic compressive strengthstorage periodwater content
马芹永,张阳阳,马冬冬.混合料贮存期和含水率对预拌补偿收缩混凝土动态抗压强度影响的试验与分析[EB/OL].(2016-08-03)[2025-08-23].http://www.paper.edu.cn/releasepaper/content/201608-27.点此复制
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