| 摘要: |
| 采用低场核磁共振技术，研究了养护温度对陶粒内水分在水泥浆体中迁移行为的影响.结果表明：低场核磁共振技术可以在不破坏试样的前提下，连续观测陶粒内水分向水泥浆体中的迁移时间、迁移量；随着水泥水化的进行，陶粒逐渐释放水分，保证了水泥浆体内的非化学结合水含量，抑制了水泥浆体相对湿度的降低；升高养护温度将使水泥水化加快、水泥浆体的相对湿度降低速度加快，从而使陶粒内水分向水泥浆体中迁移加快，如养护温度分别为20、30、40℃的试样，其陶粒内的水分含量在6h时分别减少了16.9%、22.6%、23.1%，28d时都减少了70%左右. |
| 关键词: 低场核磁共振 养护温度 陶粒 水分迁移 |
| DOI：103969/j.issn.1007 9629202001021 |
| 分类号: |
| 基金项目:上海市科学技术委员会科研计划项目（17DZ1200303） |
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| Effect of Curing Temperature on Migration of Water from Ceramsite to Cement Paste |
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YANG Zhenghong1, GAO Shuangshuang2, YU Long1, LI Tingting2
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1.Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, Tongji University, Shanghai 201804, China;2.School of Materials Science and Engineering, Tongji University, Shanghai 201804, China
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| Abstract: |
| A water saturated ceramsite sample was prepared in contact with cement paste to investigate the influence of curing temperature on the water migration from ceramsite to cement paste. Low field NMR technique was applied for the purpose. Results show that the water migration from ceramsite to cement paste can be observed continuously by low field NMR technology without damaging the sample. During the cement hydration process water is released, and transfers to cement paste. And the water from ceramsite inhibits the relative humidity reduction of cement paste in the course of hydration, then ensures non chemically bound water content in cement paste. The hydration of cement paste can be accelerated if the curing temperature rises. The water migration from ceramsite to cement paste can also be accelerated by increasing the curing temperature. When the samples were cured for 6 hours, the water content in the ceramsite was reduced by 16.9%, 22.6% and 23.1%, for samples with curing temperature of 20, 30, 40 ℃ respectively. When the samples were cured for 28 d, the water content in the ceramsite was reduced by about 70%. |
| Key words: low field NMR curing temperature ceramsite water migration |
