砂砾垫层 碾压时,含水量偏差不能大于多少

2025-03-26 02:08:27
推荐回答(1个)
回答1:

填料含水率范围的确定与控制
填料含水率范围的确定
通过击实试验测定室外回填土最优含水率为 5.1%,室 内水泥稳定土最优含水率 6.5%,填料为黏性土:当设计压实系数为0.9时,施工含水率与最优含水率之差可控制在-4%~+2%范围内,当使用振动碾时,该差值可控制在-6%~+2%范围内;当设计压实系数≠0.9时,参照本文其他类土的要求执行。
填料为其他类土:如果均化后分不清土质,可根据式(1)计算出控制干密度:
Ρ控=λρdmax
式中:ρ控——控制干密度;
pdmax——做击实试验得到的最大干密度;
λ——设计压实系数。
按p控值在pd-ω关系曲线图上做ω轴的平行线(图l中虚线),得到p控线与pd-ω曲线的交点а,和a2。通过al和a2做pd轴的平行线,与ω轴相交得到ω1与ω2,某类填料(土)的含水率应控制荏ω1~ω2之间,达到最优含水率ωopt效果更好。

附:填料含水率的控制
回填土施工前36 h,应对待用的填料进行含水率测定。当含水率符合既定要求时,可直接用于回填土施工;当含水率低于ω1时,可按照达到该类土最优含水率ωopt要求的需水量洒水湿润,翻拌均匀后集中成堆。各种类型土料的浸润时间要求为:黏土≮24 h;亚黏土和轻亚黏土≮12 h;砂土≮6 h;其他杂填土应延长浸润时间,以浸润均匀为宜。
已调好含水率的备用填料(土)宜及时使用。若不能及时使用,则有塑料薄膜覆盖的填料存放时间≯7 d,没有塑料薄膜覆盖的填料存放时间≯2 d,夏季天气干燥时还应适当减少堆放时间。若超过上述规定,应重新测定并调整含水率。当取用备用填料时,应从料堆上一个部位取用,以尽量减少暴露面;暂停施工时应及时圆堆,以减少水分损失。

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