Comparative analysis of strength characteristics of grouting mortars

Abstract

Abstract. The practice of building in difficult geological and hydrogeological conditions found wide use grout mixes used to fill old mine workings or large underground cavities. However, the traditional oil well cementing cementing solutions causes a large flow rate of the solution in the absorbing horizons and its erosion under the influence of the tributaries of the water. A problem arises, which is associated with insufficient provision of guaranteed strength and durability fixed soil or structures, as well as in environmental and health safety used injectable compositions. A promising direction in the construction material science is the approach to the directed structure formation of composites that are initiated by the introduction of nanomodifiers, having ultra-small dimensions in super small quantities. The aim of this work is to develop new cement compositions with improved processing characteristics, based on the comparison of the effect of additives aluminosilicate nanotubes (ANT) and boehmite on the structure formation of cement composites. The main components of the composite solution were: bentonite П2Т 2 А, ANT, bemit, cement and liquid glass.Performed x -ray phase analysis of boehmite and ANT. Studied the structure formation of composite systems. It is established that the highest rate of structure formation is achieved at a concentration of boehmite 0.208% by weight of cement. Relative to the control sample, the rate of structure formation increases 1.3 times. With the introduction of additives ANT the greatest strength of the composite solutions was achieved with the introduction of 0.125% by weight of cement. It was found that cement compositions based on ANT after 28 days of storage the strength of the compositions is increased almost 2 times compared to the composite solution with additives boehmite. It is established that a promising direction for obtaining of composite systems is the modification due to the introduction of environmentally friendly aluminosilicate nanotubes based on natural mineral.

Sulfur-Modified Composites for Enhancement of Building Foundations

“…The main direction of environmental policy is the involvement of production waste in the economic turnover [14][15][16][17][18][19][20][21][22]. There are a number of reasonable directions for the use of production waste -sulfur -in various technologies [23][24][25][26][27].…”

Kinetics of structure formation of a composite mortar with nano-additives based on aluminium

“…7). Thus it was found that nano-additives accelerate the hydration of clinker constituents of cement, which leads to acceleration of structure formation of composite mortars and, as a result, to reduction in their flowability loss time [19][20][21][22][23].…”