Cement-based ultra-high strength contraction-free grouting concrete

Abstract

The invention provides a cement-based ultra-high strength contraction-free grouting concrete which is composed of cement, quartz sand, water reducer, swelling agent, defoamer, anti-settling agent, steel fiber, retarder and water-retaining agent in parts by weight: 100 parts of cement, 5-10 parts of swelling agent, 50-100 parts of quartz sand, 0.5-2.5 parts of water reducer, 0.3-1.0 part of defoamer, 0.1-0.3 part of anti-settling agent, 5-30 parts of steel fiber, 0-1.0 part of retarder and 0.1-0.3 part of water-retaining agent. The invention has the following beneficial effects: (1) at the normal temperature, the 1d compression strength of the cement-based grouting concrete is improved to be above 70 MPa; (2) at the normal temperature, the 28d compression strength of the cement-based grouting concrete is improved to be above 120 MPa; and (3) the cement-based ultra-high strength contraction-free grouting concrete can be used for installing large, ultra-large equipment basis, and can be used for occasions, such as bolt anchoring, structure fastening, road repair and the like which have high requirements on the compression strength of grouting concrete.

Description

technical field [0001] The invention relates to a cement-based non-shrinkage grouting material, in particular to a cement-based ultra-high-strength non-shrinkage grouting material that can be used for equipment installation, bolt anchoring, engineering reinforcement, road surface repair and the like. Background technique [0002] Cement-based grouting material is a special construction dry powder mortar with cement, sand, admixture, etc. as the main raw materials. After being evenly mixed in the factory, it is transported to the site and can be used directly after adding water and mixing. It has good durability, high fluidity, and high strength. , No shrinkage and other advantages, it is the material of choice for industrial equipment installation, bolt anchoring, engineering reinforcement, etc. In 2008, China issued the national standard GB / T 50448-2008 "Technical Specifications for the Application of Cement-based Grouting Materials" on cement-based grouting materials. The ...

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Problems solved by technology

[0003] Chinese patent CN1458113A discloses a high-performance non-shrinkage cement-based grouting material and its preparation method, but does not specify the compressive strength that can be achieved by the cement-based grouting material prepared according to this method; Chinese patent CN101134663A discloses a non-shrinkage grouting material material, its 28d compressive strength can only reach 71.5MPa; Chinese patent CN1271696A discloses a high-strength superfluid expansion cement grouting material, its 28d compressive strength can reach 90MPa, but the 1d compressive strength is only 20MPa

Chinese patent CN1039788A discloses a production method of ultra-high-strength cement material, whose compressive strength can reach 150MPa, but the material itself does not have fluidity, and requires a special hot-pressing production process, which does not meet the conditions for field application

[0004] When installing some large and super-large equipment in actual projects, due to the very large quality of the equipment itself and the heavy load during operation, higher requirements are placed on the early and later compressive strength of grouting materials. The existing cement-based grouting The material can no longer meet the requirements

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