SU1317345A1

SU1317345A1 - Method of determining strains in capillary-porous materials due to cryophase formation

Info

Publication number: SU1317345A1
Application number: SU853963484A
Authority: SU
Inventors: Сергей Владимирович Александровский; Юрий Дмитриевич Ясин; Алексей Львович Сильвестров
Original assignee: Научно-Исследовательский Институт Строительной Физики Госстроя Ссср
Priority date: 1985-07-12
Filing date: 1985-07-12
Publication date: 1987-06-15

Abstract

Изобретение относитс к методам измерени деформаций капилл рно- пористых строительных материалов во влажном состо нии при различных температурах , включа температуры образовани криофазы. Целью-изобретени вл етс повышение точности определени деформаций при снижении объема трудозатрат. Цель достигаетс тем, что при заданном исходном влагосо- держании и фиксированной те шературе на одном и том же образце регистрируют деформации и электрический параметр , устанавливают зависимости электрического параметра и деформаций от влагосодержани и температуры дл области температур, включа область образовани криофазы, с помощью которых Определ ют деформации, обусловленные образованием криофазы. 3 ил. § (Л с СА vjf 00The invention relates to methods for measuring the deformations of capillary-porous building materials in a wet state at various temperatures, including cryogenic formation temperatures. The purpose of the invention is to improve the accuracy of the determination of deformations while reducing the amount of labor costs. The goal is achieved by the fact that at a given initial moisture content and fixed temperature on the same sample, deformations and an electrical parameter are recorded, the dependencies of the electrical parameter and deformations are determined on the moisture content and temperature for the temperature range, including the There are deformations due to the formation of cryo phase. 3 il. § (L with SA vjf 00

Description

Изобретение относитс к методам измерени деформаций капилл рно-пористых строительных.материалов во влажном состр нии при различных температурах , включа температуры образовани криофазы.This invention relates to methods for measuring the deformations of capillary-porous building materials in wet conditions at various temperatures, including cryogenic formation temperatures.

Цель изобретени - повышение точности определени деформаций при снижении объема трудозатратThe purpose of the invention is to improve the accuracy of determination of deformations while reducing the amount of labor costs.

Способ осуществ15 ют следующим об разом. тThe method is carried out as follows. t

Влажный гидроизолированный образец исследуемого материала помещают в рабочий объем термостата, температуру воздушной среды которого мен ют в широком диапазоне температур. Значение температуры задают по ступен м. На каждой ступени образец вьщерживают до наступлени состо ни термодинами 10A wet, hydro-insulated sample of the material under study is placed in the working volume of a thermostat, the temperature of which is changed over a wide temperature range. The temperature value is set in steps. At each step, the sample is held until the onset of thermodynamic state 10

1515

ние криофазы, пользу сь полученными зависимост ми, определ ют количество незамерзшей воды и криофазы (фиг.1б)The amount of unfrozen water and cryophase (Fig. IB)

Величину деформации, обусловленную образованием криофазы, дл каждой равновесной температуры определ ют как разность между измеренной относительной деформацией и соответствующей деформацией, величину которой наход т из графика путем экстрапол ции зависимости дл отрицательной области температур (фиг.1б). .The amount of deformation due to the formation of a cryophase for each equilibrium temperature is determined as the difference between the measured relative deformation and the corresponding deformation, the value of which is found from the graph by extrapolating the dependence for the negative temperature range (Fig. 1b). .

Claims

Invention Formula

The method of determining the deformations caused by the formation of cryogenic capillary-porous materials by determining the phase composition and

equilibrium, followed by fixation of deformations at various

The difference in the displacement of two points on the sample surface is controlled, and at the same time an electrical parameter is recorded on the same sample that determines the phase composition of the pore fluid, for example, the dielectric constant or specific production.

Dp of the region of positive temperatures without cryogenic phase transformations establish the dependences of the electrical parameters R (t) and U (t) on moisture content and temperature and deformations Z (t) on temperature (Fig. 1 a, b, b).

For the region of stable temperatures, in which the formation of 10

15

The amount of unfrozen water and cryophase (Fig. IB) are used to determine the cryogenic phase, using the dependences obtained.

The amount of deformation due to the formation of a cryophase for each equilibrium temperature is determined as the difference between the measured relative deformation and the corresponding deformation, the value of which is found from the graph by extrapolating the dependence for the negative temperature range (Fig. 1b). .

Invention Formula

registration of deformations at various

with

0

five

equilibrium temperatures, i.e., in order to improve the accuracy of strain detection while reducing labor costs, simultaneously with recording the strain on the same sample, the electrical parameter is measured over the entire temperature range studied as the temperature decreases and then increases For the temperature range excluding the formation of a cryophase, the dependences of the electrical parameter and deformation on the moisture content and temperature are established, then they are extrapolated to the region of the cryophase formation. and, using the dependences obtained, determine the desired characteristics.

300 20010050- itO 30

20

ten

5. L J 2 L.

10 .5, Uj, -lO KzlKZ

FIG. 1Q