Patent ID: 6502636
Filing Date: 2003-01-07
Classification: C04B,Y02W,Y10S

Abstract:
A method of grouting a heat exchange pipe in a hole or trench in the ground comprising the steps of:(a) preparing a quick set grouting composition having high thermal conductivity compared to conventional cement grouts, comprising ASTM Class C fly ash present in an amount in the range of from about 25% to about 50% by weight of said composition; a second amorphous silica material selected from the group consisting of condensed silica fume, rice hull ash, natural pozzolan and mixtures of two or more said materials, present in an amount in the range of from about 1% to about 4.5% by weight of said composition; a water swellable sodium bentonite clay present in an amount in the range of from about 2% to about 5% by weight of said composition; and water present in an amount in the range of from about 30% to about 50% by weight of said composition; (b) placing said grouting composition in said hole or trench between the ground and the walls of said pipe; and (c) allowing said grouting composition to set therein.