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strength grading of mortar
bridg.constr.
砂浆标号
tech.
砂浆强度等级
strength grade of mortar
expl.
砂浆抗压强度的强度等级
砌筑砂浆的强度等级是以边长为70. 7mm 立方体试件，在标准养护条件下,用标准试验方法测得28天龄期的抗压强度值〈MPa〉来确定
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