稻壳灰对水泥基及混凝土性能影响的试验研究

发布时间：2018-06-28 00:28

本文选题：稻壳灰 + 混凝土　；参考：《中国农村水利水电》2017年05期

【摘要】：通过对不同粉磨时间、不同掺量稻壳灰(RHA)水泥基试样需水量、凝结时间和水泥胶砂强度的测试,讨论了RHA掺量及粉磨时间对水泥需水量、凝结时间的影响。结果表明,掺加RHA会增大水泥需水量,延长水泥初凝、终凝时间,当稻壳灰粉磨时间为45 min,掺量为10%时,对水泥浆的需水量和凝结时间影响不大。通过研究稻壳灰活性确定了稻壳灰粉最佳磨时间为45 min,RHA、RHA/粉煤灰(FA)部分取代水泥后,混凝土7和28 d抗压强度与基准组相比均有所下降,56 d抗压强度得到提高,其中复掺10%RHA/5%FA效果最优,较基准混凝土抗压强度提高19%。采用RCM法和电通量法研究了RHA对混凝土抗氯离子渗透性能的影响,结果表明,掺10%RHA/15%FA后混凝土抗氯离子渗透性能得到改善,抗氯离子渗透性能排列顺序为:R10F15F25JZ。
[Abstract]:The effects of RHA content and grinding time on cement water demand and setting time were discussed by testing the water requirement, setting time and cement sand strength of cement samples with different grinding time and different amount of rice husk ash (RHA). The results showed that the addition of RHA could increase the water requirement of cement and prolong the initial setting and final setting time of cement. When the grinding time of rice husk was 45 min and the amount of RHA was 10, the water requirement and setting time of cement slurry had little influence. By studying the activity of rice husk ash, it was determined that the optimum grinding time of rice husk ash powder was 45 min RHAA / fly ash (FA) to partially replace cement, the compressive strength of concrete at 7 and 28 days was decreased and the compressive strength at 56 days was increased compared with the reference group. Among them, 10% RHA / 5 has the best effect, and the compressive strength is 19% higher than that of the reference concrete. The effect of RHA on chloride ion permeability of concrete was studied by RCM method and electric flux method. The results showed that the chloride permeation resistance of concrete mixed with 10RHA / 15 was improved, and the order of chloride penetration resistance was: R10F15F25JZ.
【作者单位】：宁夏大学土木与水利工程学院;银川能源学院;
【基金】：国家自然科学基金资助项目(51368049) 银川能源学院校级科研项目(2016-KY-Z-13)
【分类号】：TU528

【相似文献】