Determination of the usefulness of cementitious soil

Abstract

In the technology of placing cementitious road layers clothing it is important to have data on the convenience the work for this material.  The period of convenient cementitious cultivation is determined by the time until the beginning of the cement production.  The time required to seal the mortar from the fortified soil should be set up in advance, based on the expected air temperature during the work. It is obvious that the sealing of cement-mortar mixtures should be completed before crystallization bonds are formed as a result of cement hydration. This will enable the material to be sealed without destroying newly formed crystalline bonds and reducing its mechanical properties.

In carried out experimental studies in laboratory, conditions were created with the help of a thermowardrobe with forced air circulation. They were adopted in order to simulate the conditions transportation of the mixture to the work place. After 1, 2, 3 and 4 hours after holding the mixtures in the thermocouple, cylindrical specimens were formed from them and the average density of the samples was determined immediately, and after 28 days in a hydraulic bath, compressive strength and fracture strength were determined.

The obtained dependences allow to predict the level fall of strength indicators, depending on the loss cement-based mixtures of moisture under various temperature conditions.

Thus, the obtained results indicate that the length of the technological process from the moment preparation of the cementious mixture to the end of its consolidation should be determined by the induction period, which can be provided with a slightly more amount of moisture in its composition, compared with the optimum.  This will ensure the preservation physical and strength characteristics of the properties cementitious road layers clothing.