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赖海珍, 陆程铭, 荆慧斌, 张 帅.高寒地区复掺矿物掺合料水工混凝土抗冻耐久性劣化机理研究水资源与水工程学报[J].,2019,30(2):191-197
高寒地区复掺矿物掺合料水工混凝土抗冻耐久性劣化机理研究
Study on frost resistance durability deterioration mechanism of hydraulic concrete with mineral mixed admixture in alpine regions
  
DOI:10.11705/j.issn.1672-643X.2019.02.30
中文关键词:  水工混凝土; 耐久性; 冻融循环; 复掺矿物掺合料  劣化机理; 高寒地区
英文关键词:hydraulic concrete  durability  freeze-thaw cycles  composite addition of mineral admixture  deterioration mechanism  alpine regions
基金项目:国家自然科学基金项目(50779051)
作者单位
赖海珍1, 陆程铭2, 荆慧斌2, 张 帅3 (1.崇明区农村水利管理所 上海 202150 2.上海泾景水利工程设计有限公司上海 200940 3.西安理工大学 水利水电学院 陕西 西安 710048) 
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中文摘要:
      为评定高寒地区环境对掺矿物掺合料水工混凝土结构冻融循环耐久性能的影响规律,通过不同掺合料掺量及种类、不同冻融温度下水工混凝土冻融循环试验,研究分析不同配合比水工混凝土的质量损失率、相对动弹性模量、抗压强度以及渗透性的时变规律,揭示了矿物掺合料与冻融温度对混凝土抗冻性的影响机理。试验结果表明:各掺合料水工混凝土的抗冻性从优到劣依次为粉煤灰+硅灰+稻壳灰>硅灰+稻壳灰>粉煤灰+稻壳灰>粉煤灰+硅灰>稻壳灰>硅灰>粉煤灰>未掺加;相同单掺条件下,掺加稻壳灰试件组抗冻性最强,硅灰居中,粉煤灰最弱;复掺矿物掺合料情况下,三掺粉煤灰、硅灰、稻壳灰混凝土抗冻性最强;复掺矿物掺合料能减少水工混凝土的孔隙率及渗透性,且粉煤灰、硅灰、稻壳灰的颗粒粒径不同会相互填充,从而产生超叠加效应;随着冻融循环过程中试件中心温度的降低,导致混凝土内部的温度梯度增大,孔隙内部的膨胀压力增大导致混凝土内部结构破坏。
英文摘要:
      In order to evaluate the effect of alpine region environment on the freeze-thaw cycle durability of hydraulic concrete structures with mineral mixed admixtures, the freeze-thaw cycles of hydraulic concrete with different mixture amount, mixture type, and freeze-thaw temperatures were studied and analyzed. The time-varying laws of mass loss rate, relative dynamic elastic modulus, compressive strength and permeability of hydraulic concrete with different mixing ratios were studied and analyzed, and the influence mechanism of mineral admixtures and freeze-thaw temperature on the frost resistance of concrete was revealed. The test results showed that the frost resistance of concrete with different admixtures ranked: fly ash + silica fume + rice husk fume > silica fume + rice husk fume > fly ash + silica fume > fly ash + silica fume > fly ash + rice husk fume > rice husk fume > silica fume > fly ash > without addition. Under the same single mixing condition, the test group with rice husk ash had the highest frost resistance, the silica fume was in the middle, and the fly ash was the weakest. For mineral mixed admixtures with several minerals, three of fly ash, silica fume and rice husk ash have the strongest frost resistance. Mixed mineral admixtures can reduce the porosity and permeability of hydraulic concrete, and different particle sizes of fly ash, silica fume and rice husk ash will fill each other, resulting in superimposition effect. The freeze-thaw damage of hydraulic concrete increases with the decrease of central temperature during freeze-thaw cycles, which is mainly due to the increase of temperature gradient in concrete and expansion pressure in pore.
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