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Aggregates and Water

Aggregate Pore States and Water Uptake

Description

Aggregate contains pores of different sizes, and those pores may be sealed inside the particle or open to the surface. Open pores let water enter the aggregate. Because aggregate makes up about three-quarters of concrete by volume, its porosity strongly affects the porosity of the finished concrete.

Transcript

集料的孔隙率是指集料中孔隙的体积。

这些孔隙大小不一,有的被包裹在聚集体内部,有的则相互连通并通向其表面,水或其他液体可通过这些通道进入聚集体。

饱和面干状态意味着所有集料孔隙均已被水分填满,但其表面是干燥的。

同时,潮湿状态表明饱和集料表面存在过量水分。

当处于饱和面干状态的集料暴露在空气中时,部分水分会从孔隙中蒸发,导致其进入气干状态。

当骨料在烘箱中烘干时,其孔隙中的水分完全蒸发,表明已达到绝对干燥状态。

吸水率按集料在饱和面干状态与绝干状态之间的质量差计算,并以样品干质量的百分比表示。

最后,混凝土集料孔隙中吸收的水分将无法用于水泥水化或改善混凝土的工作性能。

此外,...

Tags

Aggregate PorosityWater AbsorptionSaturated Surface DryOven Dry StateConcrete PorosityPore StructureMoisture ContentAggregate TestingWater Loss MeasurementConstruction Materials