A rapid determination method and device for the sand permeability coefficient of planting porous concrete
A porous concrete, rapid measurement technology, applied in the measurement device, suspension and porous material analysis, permeability/surface area analysis, etc. Test error, simple structure effect
Inactive Publication Date: 2019-08-06
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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Problems solved by technology
[0003] The key to the grass-planting function of ecological porous concrete lies in its average pore size and the ability to allow vegetation roots to penetrate; the existing characterization methods for the pore structure of ecological porous concrete, such as water permeability coefficient and porosity, cannot accurately characterize its ability to allow vegetation roots to penetrate. past ability
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[0025] In the present invention, coarse aggregates with different particle sizes are used to cast test pieces, and three kinds of test pieces with each particle size are poured respectively: single layer, double layer and three layers, and the plane dimensions of each test piece are the same.
[0026] The device for testing the sand permeability coefficient of the planting type porous concrete disclosed by the invention comprises a sliding plate, a supporting box, a baffle, a cover cylinder and a recovery box. The slide plate, the support box and the baffle are connected into a funnel-shaped device. The slide plate has a smooth surface and is installed obliquely in the support box. The baffle is connected vertically above the slide plate in the support box. The lower edge of the slide plate is connected to the There is a gap between the slides, and the support box corresponds to the lower end of the slides, and there is a sand slide outlet that is consistent with the width of t...
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Abstract
The invention discloses a method and an apparatus for rapidly determining the sand permeation coefficient of vegetative porous concrete. The apparatus comprises a funnel-shaped device, a test piece cover cylinder and a sand recovery box, a sand falling opening is arranged at the upper side of the recovery box, a test piece covers the sand falling opening, the test piece cover cylinder covers the test piece, a quantitative amount of sands slid from the funnel-shaped device and are uniformly sprinkled onto the upper end surface of the test piece in the cover cylinder, and the sands permeating the test piece enter the recovery box. The sand permeation coefficient of the test piece, which is the mass of the sands permeating the test piece in per unit of time, is calculated through recording the moment when the sands start to leave the slide plate of the funnel-shaped device and the moment when all the sands leave the slide plate, and weighing the net weight of the recovery box and the total weight of the recovery box and the sands. The compatibility between the pore structure of vegetative ecological porous concrete and the vegetation root system is analyzed through using the sand permeation coefficient. The method and the apparatus can rapidly, timely and accurately determine the sand permeation coefficient, and are of great significance to ensuring the long life cycle of the vegetation of the porous concrete and evaluating the plant growth performance of the porous concrete.
Description
technical field [0001] The invention belongs to the field of plant-growing porous concrete, and in particular relates to a method and device for quickly measuring the sand permeability coefficient of plant-growing porous concrete. Background technique [0002] Environmental problems such as the urban heat island effect caused by the large-scale application of ordinary concrete, global warming caused by increased carbon dioxide emissions, and sea level rise have seriously threatened the living environment of human beings. Domestic and foreign researchers have gradually made ordinary concrete ecological, that is, by adjusting the components and proportions of concrete, controlling its strength, porosity, pore size and other control indicators to obtain the required ecological porous concrete; the application of porous concrete that meets the requirements of vegetation growth On roofs, green belts, slopes, etc., it plays an important role in improving the urban ecological envir...
Claims
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IPC IPC(8): G01N15/08
Inventor 尹健张贵李晟刘天娇孙劲舟何霄伍松云梁巧杨婕雯
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY