压碎指标为4

压碎指标百度百科

压碎指标（δa）= (m0m1)/m0×100% 指标介绍碎石和卵石等混凝土粗骨料的强度可用岩石立方体强度和压碎指标两种方法表示将一定质量气干状态下95~132mm的石子装入压碎指标测定方法一、碎石的压碎指标 1方法概要本方法适用于测定碎石和压碎指标测定方法百度文库

713 碎石或卵石的压碎值指标试验普通混凝土用砂

2007年6月1日多种岩石组成的卵石，应对公称粒径200mm以下和200mm以上的标准粒级 (100～200mm)分别进行检验，则其总的压碎值指标δα应按下式计算：式中 δα——总压碎指标测定方法一、碎石的压碎指标 1方法概要本方法适用于测定碎石和卵石抵抗压碎的能力，以间接地推测其强度 2、引用标准 GB/T14685—2011《建筑用卵石、碎石》压碎指标测定方法百度文库

碎石压碎值试验步骤合集百度文库

对多种岩石组成的卵石,当其公称粒径大于200mm颗粒的岩石矿物成分与100~200mm 粒级有显著差异时,应将大于20mm的颗粒应经人工破碎后, 筛取100~ 200mm 标准粒级另 2018年6月20日 JTGT F502011《公路桥涵施工技术规范》中规定碎石的压碎指标玉类约18%、域类约20%、芋类约30%。其中玉类宜用于强度等级大于C60 的混凝土，域类宜用于强度等级为C30耀C60 及有抗冻、粗骨料压碎指标对混凝土力学性能的影响中国砂石

31 砂的质量要求普通混凝土用砂、石质量及检验

2007年6月1日经试验证明，中、低等级混凝土的强度不受压碎指标的影响，人工砂的压碎值指标对高等级混凝土抗冻性无显著影响，但导致耐磨性明显下降，因此将压碎值指标压碎指标是用来表示矿石抗破碎强度的指标，在操作条件下达到某一指标值时会使矿石产生颗粒破坏。压碎指标是以单位重量的矿石所需要的能量 (W)和压碎比 (α)为计算依据的。压碎指标名词解释百度文库

颗粒压碎强度系数百度百科

颗粒压碎强度系数（coefficient of crushing strength of carbon particle）是指定量的指定尺寸范围的焦炭颗粒，用标准测试方法加压，未被压碎的数量（大于指定尺寸范围的下限）天平：称量不小于5kg，感量不大于1g。压力机：500kN，应能在10min内达到400kN。压力机：量程500kN，示值相对误差不大于2%，同时应能10min±30s均匀加载《公路工程集料试验规程》JTG 34322024：压碎值试验

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