用于对井管进行围填的砂砾。 一般要求选用质地坚硬、不易破坏、具有化学惰性、外形滚圆、粒度均匀的石英质或硅化的砾岩。
砂砾料 sand and gravel materials ; sand-gravel composites
铁道砾石用集料 Aggregates for railway ballast
细砾骨料 fine gravel aggregate ; fine graudio-videoel blend ; fine graudio-videoel mixture
砾石骨料 gravel aggregate
砂砾石骨料 sand-gravel aggregate
砾石颗料排列 gravel arrangement
砾石骨料混凝土 gravel concrete
塑料胶结砾石 plastic consolidated gavel
塑料涂敷砾石 plastic coated-gravel
砂砾卵石混合料 gravel pebble mixture
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