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灌砂法基本原理是利用粒徑0.30~0.60mm或0.25~0.50mm清潔乾淨的均勻砂,從一定高度自由下落到試洞內,按其組織重不變的原理來量測試洞的容積,並根據集料的含水量來推算出試樣的實測幹密度.
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