SU718404A1 - Building mortar for producing samples - Google Patents

Description

, I

The invention relates to the testing of hydraulic permeables obtained on the basis of port and cement clinker.

A mortar is known for making samples for hydraulic hydrated testing, including cement, silica sand, and water l.

The disadvantage of this mortar is the use of silica sand of 0.5-0.9 mm, characterized by low adhesion to cement stone, which does not allow to obtain, after steaming and cooling, strength close to the standard.

The purpose of the invention is to accelerate the testing of cement and, after steaming and cooling, a strength equal to 98-102% of the standard.

The goal is achieved by the fact that the mortar for the manufacture of samples for the testing of hydraulic in cement, / including cement, quartz sand, and water, contains quartz sand.

0.14-0.315 mm and additionally sand granite fraction 2.15-5 mm with the following ssyutnoenii components, wt.%: Cement22,6-22,8

Quartz sand22,6-22,8

Granite sand45,2-45,6

What is Else

The solution is prepared as follows. You are given a grunt of 2.5–5 mm, 500 g of quartz sand 0.14–0.315 mm and 500 g of cement, and pour them into a spherical bowl previously wiped with a wet cloth, and the cement is mixed with fine aggregates for 1 minute.

Claims (1)

Then, in the center of the dry mixture, make a well, pour water into it, allow it to soak for 0.5 minutes and stir the mixture for 5 minutes. At the same time, water is absorbed in such an amount that the water-cement ratio of the prepared solution is equal to the water-cement ratio of the standard solution or to the value more or less according to the formula 2, where p is the normal density of cement paste,%. After mixing is completed, the solution is placed in forparties and Era balls 40x40x160 in size and compacted on a vibrating plate using a standard technique. Immediately after compaction, the samples are placed in a rubber sheet and kept in a normal form at a normal room temperature for 2 hours, and then stirred in a chamber and steaming: T according to the 3 + 6 + 2 h mode at an isothermal heating temperature of 80 + 3 ° C. After steaming, the caps are spalled and kept under room conditions for 4 hours. The test of fabricated specimens for bending and compressive strength is described in standard procedure. DETAILED DESCRIPTION OF THE INVENTION A mortar for making samples for testing hydraulic fluid, including cement, quartz sand, water, characterized in that, in order to accelerate the dement test and to obtain after steaming and cooling strength equal to 98-1О2% of the standard, it contains quartz sand fraction 0.14-0.315 mm and additionally sand granite fraction 2.55 we have the following ratio of components, / weight,%: Cement 22.6-22.8 Quartz sand22.6-22.8 Granite sand45.2-45 , 6 Water. The rest. Sources of information taken into account during the examination 1. A. A. Kayser and others. Cements and their rational use in the production of precast concrete products. M., stroiizdat, 1972, p. 71-72.