SU622007A1

SU622007A1 - Method of determining water absorption of porous building materials

Info

Publication number: SU622007A1
Application number: SU772480015A
Authority: SU
Inventors: Юрий Дмитриевич Ясин; Игорь Яковлевич Киселев
Original assignee: Научно-исследовательский институт строительной физики
Priority date: 1977-04-28
Filing date: 1977-04-28
Publication date: 1978-08-30

Description

Изобретение относитс к области исследовани водопоглощени и подготовки к испытани м, например, на морозостойкость образцов строительных материалов.The invention relates to the field of water absorption studies and preparation for testing, for example, on the frost resistance of samples of building materials.

Известен способ определени водопог лощени пористых строительных материалов путем погружени образца в воду и выдержки в воде в течение установленного времени. Водопоглощение материала или издели характеризуетс отношением в процентах массы воды, поглощенной погруженным Б воду образцом при нормальном атмосферном давлении, к массе того же образца, высушенного до посто нной массы ijThere is a known method for determining the water supply of porous building materials by immersing the sample in water and holding it in water for a set time. The water absorption of a material or product is characterized by the ratio in percent of the mass of water absorbed by a submerged B water sample at normal atmospheric pressure to the mass of the same sample dried to a constant mass ij

Недостатком данного способа вл етс длительность процесса водопоглощени .The disadvantage of this method is the duration of the water absorption process.

Наиболее близким из известных вл етс способ определени водопоглоШеии пористых строительных материалов путем погружени в воду образца, выдержтси в воде и последующего взвещквани 2. . ,The closest known method is to determine the water absorption of porous building materials by immersing the sample in water, holding it in water and subsequent charging. 2.. ,

Этот способ позвол ет сократить процесс водопоглощени образца строительных материалов, однако в процессе водопоглощени образцы испытывают значителные термические напр жени и деформации . Это не позвол ет использовать спо- соб дл подготовки образцов строительных материалов к испытани м на морозостойкость .This method allows to reduce the process of water absorption of a sample of building materials, but in the process of water absorption the samples experience significant thermal stresses and deformations. This prevents the use of the method for preparing samples of building materials for frost resistance tests.

Цель изобретени - интенсификаци процесса водонасыщени без изменени структуры образца.The purpose of the invention is to intensify the process of water saturation without changing the structure of the sample.

Достигаетс цель тем, что образец выдерживают в воде сначала под давлением , равным 0,5 атмосферного, до прекращени вьщелени из него пузырьков воздуха , а затем в течение того же времени - при атмосферном давлении.The goal is achieved in that the sample is kept in water, first under a pressure of 0.5 atmospheric pressure, until the air bubbles are no longer separated from it, and then during the same time at atmospheric pressure.

Способ осуществл ют следующим образом .The method is carried out as follows.

Claims

A sample of building material is immersed in water, on the surface of which a pressure of 0.5 atmospheric is applied. The sample is kept in water until the air bubbles are removed from it, and then at atmospheric pressure for the same time. The sample is removed from the water to a constant weight and the amount of water absorbed is calculated. Comparative tests carried out on a panel of wall and cladding building materials have shown the comparability of the results of the determination of water absorption by the proposed and by the standard method with a sufficiently high accuracy. At the same time, the time for determining water absorption by the proposed method is reduced by no less than two orders of magnitude compared with the known method. The proposed method will find practical application in determining the water absorbency and preparation for testing, for example, on the frost resistance of samples of building materials. Formula of the Invention. A method for determining the water absorption of porous building materials by immersing a sample, holding it in water and then weighing it, due to the fact that, in order to intensify the process of water saturation without changing the sample structure, at a pressure of 0.5 atmospheric, until the air bubbles are released from it, and then at atmospheric pressure for the same time. Sources of information taken into account in the examination: 1.GOST 7025-67, Materialshenenovye and facing. Methods for determining water absorption and frost resistance.

2. Author's certificate N 421928, cl. GOI N33 / 38, 1972.