Method and device for rapidly extracting saturation pore water from cement-based material

Abstract

The invention discloses a method and a device for rapidly extracting saturation pore water from a cement-based material. The method comprises the following steps of: smashing the cement-based material into particles, soaking the particles by water, placing in a vacuum apparatus and carrying out continuous vacuum pumping treatment for 12 hours to 16 hours, and stopping vacuum pumping treatment until no bubbles are generated; filtering the water on the surfaces of the particles, rapidly filling the filtered particles in a hole solution extractor, placing on a universal testing machine pressing plate, pressurizing, and then squeezing out the pore water in the particles. The device is composed of an outer cylinder (1), a pinhole filter screen (2), a macropore inner cylinder (3) and a force transferring cylinder (4). The solution extracted by the device provided by the invention is a pore solution under saturation state flowing out when the particles are squeezed, other substances are not introduced, and composition or concentration of the pore solution is also not changed, so that the actual situation of void water is truly reflected; the device has double filtering effects, the extracted void water does not contain broken particles or impurities, and test foundation is provided for relevant analysis of void water of cement-based materials.

Description

Technical field [0001] The invention relates to a method capable of quickly absorbing water close to saturation of cement-based materials and extracting pore water thereof, and also relates to a device for realizing the method. Background technique [0002] The water content of cement-based materials will cause changes in their physical and mechanical properties, and the amount of water content has different effects on material properties. Test pieces with high water content have a large degree of deterioration in physical and mechanical properties, and their extreme water state is often studied in the laboratory— The thermal deformation, compressive strength, frost resistance, and durability of cement-based materials (mortar, concrete, etc.) under water-saturated state. The analysis of the mechanism usually requires obtaining the surface tension of pore water, effective alkali content, and contact Angle, chloride ion content or pore water composition analysis, electrochemical te...

AI Technical Summary

Problems solved by technology

The disadvantages of this equipment mainly include the following aspects: First, the function of this equipment is too simple, it is only suitable for cement stone samples smaller than Φ100mm*60mm discs, and it is not suitable for forming and testing concrete specimens due to its small size; The solution filtration function of the equipment is poor, and it is only filtered through nylon cloth. When the pressure is high, or when the sample is granular, the nylon cloth is crushed, and after the cement stone is embedded, the filtering effect will be compromised, and the obtained solution will have a certain impurities, on the basis of which the device is not suitable for extrusion of granular test pieces

In view of the difficulty of water saturation of the specimen, when extracting the pore water of the saturated mortar, the specimen is usually broken into small particles in order to reduce the water absorption saturation time, so the extrusion of the mortar saturated pore water is not suitable for using this equipment

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