SU617715A1 - Method of determining cement content in soil-cement mixture - Google Patents

Description

one

The invention relates to a method for analyzing road building materials, in particular, to a method for determining the cement content in a cement-ground mixture, and can be used both in laboratories and in field conditions.

There is a method in which a sample weighing 300 g is treated with 200 ml of Zn. HC1. After stirring for 18 minutes, the acid is diluted to 1N. After 30 minutes, take 100 ml of the solution and titrate with 1N. NaOH. The cement content is determined by the magnitude of the titer and the calibration curve.

The closest to the proposed method is the determination of the cement content in the cement-ground mixture by treating the sample with a liquid medium to convert the soluble components of the mixture into solution, settle the solution and determine the cement content according to a calibration curve.

However, the known methods require the use of chemical reagents, do not take into account the variation of the properties of the mineral mixture - chemical composition and salinization, which reduces the accuracy of measurements. In addition, such methods are not applicable for

mixtures, including stone materials. The purpose of the invention is to simplify the process of determination by eliminating the use of chemical reagents.

This is achieved by processing the sample in boiling water, defending, filtering, and after filtration its density is measured, according to which the content of cement in the cement-ground soil is judged.

mixes.

The method is carried out as follows. Cement-ground mixes are prepared with various known cement contents. From the prepared mixtures, weighed samples weighing 150 g, are poured into 200 ml of boiling water and boiled for 5 minutes. Then they are left to stand for 1 minute, filter and change the density of the resulting solution with a hydrometer. According to the received data

calibration graphical dependence of the change in the density of water extracts on the cement content in the mixture.

When determining the content of cement in a controlled mixture, a portion of a mixture weighing 150 g is treated in the same way and according to the obtained density of the water extract using a calibration function3

Bridges establish the cement content in the controlled mixture.

The determination of the density of aqueous extracts of cement-ground mixtures can also be performed by the picnometric method or by hydrostatic weighing in a controlled fluid using a Westfal scale or a similar design.

Since different soils may have different nature and degree of natural salinization, the resulting calibration dependence for cement-ground mixture using a specific soil can be used only for this or similar soil.

Claims (1)

Invention Formula The method of determining the cement content in the cement-soil mixture by treating the sample with a liquid medium to transfer the soluble components of the mixture into solution, settling the solution and determining the cement content using a calibration curve, characterized in that, in order to simplify the process of determination by eliminating the use of chemicals, the sample was processed they are boiled in boiling water, settled, filtered, and after filtration, its density is measured, according to which the cement content in the cement-ground mixture is judged.