In the granular material layergapVolume (including open pore Vi）The ratio to the volume of the whole granular material layer (stacking volume) is called void ratio.
Voids refer to pavementconcreteThe percentage of void volume between aggregates in the total volume of concrete, that isVoid volume, in VCexpress.these ones hereporeThey are either interconnected (closed pores) or connected to the surrounding atmosphere (open pores).[1]
The void ratio of the test pavement is determined by the following formula according to the core samples collected;
Where apparent density ρaIt is determined by the following formula:
ρa=m/V
Where
M -- quality of core samples taken from the test pavement;
V - volume of the core sample, excluding road surface openinggapVolume of air.
The density is determined according to the measured quantity of binder mass and volume, aggregate mass and volume contained in each core sample.
It is given by the following formula:
Where
MB——Binder quality;
MA——Quality of filler;
VB——Volume of binder;
VA——Volume of filler.
Voids in composites
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Chinese Name: Void Ratio of Composite Materials
English name: void content of composite
Definition: void content of composite material iscompound materialinVoid volumeThe percentage of the whole composite volume is an evaluationResin baseOne of the important indicators of composite material quality.
Voids of riprap
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The percentage of voids in the riprap volume.It is used to indicate the compactness of riprap.Its size is related to the grading of stone in the natural state, so each specification of stone is required to have a good grading to minimize the porosity of riprap.
Hydraulic structureThe void ratio of riprap embankment shall not exceed 35%~40%, the void ratio of masonry stone shall not exceed 25%~30%, and the void ratio of 10kg~100kg block stones thrown on the wharf foundation bed and behind the wall prism shall generally be about 38%.For the riprap foundation bed, the superstructure can be built only after being tamped or ballasted by heavy hammer to reduce the deformation of the building.
