Early-strength erosion-resistant clay cement paste

Abstract

The invention provides an early-strength erosion-resistant clay cement paste which comprises a clary cement paste and a matched modifier, wherein the clary cement paste is prepared from clay raw stock, cement and the balance of water; the clay raw stock is obtained by stirring clay with water, and the specific gravity of the obtained clary raw stock ranges from 1.15g / cm<3> to 1.40g / cm<3>; the ratio of the total mass of the clay in the clary raw stock and the cement to the mass of water ranges from 10: 7 to 10: 14; the modifier is composed of sodium metaaluminate, soluble sodium metasilicate powder, aluminum sulfate and polyacrylamide, and the content of the polyacrylamide accounts for 1-10% of the sum of the weights of the aluminum sulfate, the sodium metaaluminate and the soluble sodium metasilicate powder. The early-strength erosion-resistant clay cement paste has the advantages of good controllability, good water erosion resistance, short solidification time, high early strength, excellent anti-seepage performance, low cost, environmental protection and the like.

Description

technical field [0001] The invention relates to a grouting material in the field of geotechnical engineering foundation treatment materials, in particular to an early-strength and erosion-resistant clay cement paste. Background technique [0002] In water conservancy, hydropower, mining, transportation, underground space and other geotechnical engineering foundations in permeable strata and engineering emergency reinforcement treatment of Quaternary strong permeable strata anti-seepage, plugging and grouting projects, high-pressure rotary jet grouting is often required , cement grouting, pouring mortar or gravel, chemical grouting and other grouting techniques for anti-seepage and plugging. However, these traditional grouting processes often cause the loss of grouting materials due to high head pressure, fast groundwater velocity, large seepage flow, and large diffusion radius of the grout during grouting operations, resulting in large waste and poor anti-seepage and pluggin...

AI Technical Summary

Problems solved by technology

However, there are also defects such as high cost, complicated pulping process, and difficult precise control of the coagulation time of the slurry against factors such as temperature, stirring uniformity, and mixing amount, which lead to premature solidification of the slurry in the pulping barrel; at the same time, due to the formation of Due to the high early strength of the grouting layer, it is easy to cause pipe fixing and buried pipe phenomenon during continuous grouting, which is not conducive to plugging under large area, large leakage volume or dynamic water conditions

[0004] And in the past patent application materials, Chinese patent CN96117823.X claims to protect a kind of clay curing slurry curing agent, this curing agent is mainly used for grouting and water stop under the condition of flowing groundwater, adopts clay cement with lower cost In order to control the gel speed, add water glass, but often because the slurry contains a lot of water and clay, it hinders the curing speed of the slurry

In the application of large-scale plugging and anti-seepage projects, it is easy to be washed out and destroyed by water due to the low early strength of the slurry stone; or the diffusion radius of the slurry cannot be effectively controlled, resulting in a large amount of waste of slurry , can not achieve the proper plugging effect of grouting

[0005] In addition, in Chinese patent 201210113973.7, a controllable clay cement anti-seepage reinforcement paste is claimed. This reinforcement paste can also be used as a grouting curing filler. It uses mineral additives, sulfates and bentonite as modifiers , has the characteristics of strong stability and strong water erosion resistance, but in the actual construction process, it is found that the price of this kind of modifier is relatively expensive, and the erosion resistance of the formed clay cement anti-seepage slurry in moving water is not good. Good; in order to reduce the fluidity of the material, a large amount of modifier is added, resulting in a rather high cost of use, and the cost of the modifier exceeds the cost of cement, resulting in limited application; it is also found in the application process that the addition of the modifier The early strength of the clay cement paste increases slowly. After the slurry is poured into the formation, it is easy to be washed away by water, and it is difficult to form a complete curtain. Therefore, it is not suitable for use in large-scale and large-scale projects.

Images