摘要
厦门海底隧道的注浆经验表明，海水对注浆结石体的影响是严重的。即使采用淡水拌和浆液，环境中海水的影响还是超出了想象。采用早强水泥，分别配制了水灰比在0．5～1．0范围内的水泥试件，在不同拌和条件和养护环境下，研究早强水泥强度随时间变化的规律。侵蚀试验表明，海水具有明显的早强作用，但随着养护时间的增加，海水侵蚀作用逐渐显现，且随着水灰比的增大而增大。水泥结石体在腐蚀过程中，其内部结构均经历一个先由于腐蚀产物的填充作用而逐渐密实再过渡到由于腐蚀产物继续产生和膨胀，使密实度逐渐降低，最后发展为强度逐渐降低的过程。基于以上分析，海底隧道注浆材料宜选用水灰比0．5左右的矿渣硅酸盐水泥浆体。
The grouting tests of Xiamen subsea tunnel indicate that the seawater has a greater impact on grouting calculus body. According to the seawater corrosion test of the early strength concrete under the condition of water cement ratio from 0.5 to 1.0, the regular pattern and reason on the strength variation to the time were researched based on different mixing and curing conditions. It is clear that the use of seawater could cause the earlier strength gain compared to the use of tap water. However, after a long-period, the use of seawater may result in the formation of deeper corrosion compared to the use of tap water, the influence is found to be significant for higher W/C. At the early age of corrosion test, the mi- crostructure of concrete would be improved due to the use of seawater. Then it would be reduced gradually, because sea- water may cause the deterioration of concrete strength after a long time. Based on the tests, the results may provide that the slag Portland cement with the water-cement ratio of about 0.5 should be selected and used in the subsea tunnel＇ s grouting engineering.
出处
《水利与建筑工程学报》
2012年第5期9-13,共5页
Journal of Water Resources and Architectural Engineering
基金
国家重点基础研究发展计划(973计划)"城市地下工程安全性的基础理论研究"(2010CB732104)
环保部公益性科研项目"中国沿海核电建设厂址地震海啸危险性分析"(201209040)
关键词
海底隧道
注浆
水灰比
侵蚀试验
水泥结石体
subsea tunnel
grouting
water cement ratio
corrosion test
cement calculus body
