The specimens are submitted to hydrostatic stress for a pre-set period. The water permeated through the test specimen is directly collected and measured into a graduated cylinder. It is therefore possible to determine the permeability coefficient in cm/sec. by the attached formula. The equipment consists of a strong metallic frame holding four cells which are hot-galvanized for anti-corrosion protection. Automatic Concrete Water Permeability Apparatus At Four Cells fully automatic apparatus is designed to carry out water permeability tests on cubic concrete specimens max.150 mm side and cylinder specimens max.160 mm diameter. Each cell includes a pressure control manometer.
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The specimen is put into the test chamber, clamped with suitable flanges with central screw and round gaskets. A known water pressure is applied on the specimens surface for a known time, as requested by Standard using a suitable air compressor having at least 5 bar pressure. Concrete Water Impermeability Apparatus Six Place apparatus is used to determine the depth of penetration of the water into the concrete (impermeability) under known time and pressure. The unit accepts concrete cubic, cylindrical or prismatic specimens having max. dimensions of 200x200x200 mm. A manometer checks constantly the applied water pressure. The water penetrated is measured by breaking the specimen, or by reading the water permeated through the graduated burette. The apparatus is supplied complete with graduated burettes fixed on the front panel.
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A dye injection system allows four dye lines to be generated which highlights visualisation of flow lines and allows flow nets to be drawn for seepage analysis. Scales on the front panel assist in the preparation of models. Permeability Apparatus consists of a framed glass tank, of internal dimensions 1900 mm long by 530 mm high and 130 mm front to back. The base of the tank incorporates fourteen pressure tappings at 100 mm pitch, the tappings are specially designed to prevent the ingress of sand particles. Flexible tubes connect the tappings to two multitube manometer banks scaled 0 to 500 mm, for measure-ment of the water table height along the tank. The tank is mounted on a fabricated steel frame fitted with castors and levelling feet. The front, back and ends of the tank are of clear toughened glass giving scratch free visibility without the risk of abrasion of the inner surfaces by the permeable medium. Scales on the front panel assist in the preparation of models and in the prepara-tion and recording of flow nets. Washed silica sand graded 0.2 mm to 1.0 mm should be used as the permeable medium which must either be ordered separately from supplied by the end user. Coarser material may also be used. An activated carbon decolourising filter is provided in the sump tank to prevent the progressive dis-colouration of the water by prolonged use of dye.
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