An early-strength high-strength non-shrinkage grouting material with a large amount of heavy slag

Abstract

The invention belongs to the field of a building engineering material, and particularly relates to a early strength type high-strength non-shrinkage grouting material with large mixing amount of mineral slag. The grouting material is prepared from the following ingredients in parts by weight: 10 to 60 parts of pelletized blast furnace heavy ore slag, 0 to 10 parts of blast furnace heavy ore slag micro powder, 25 to 60 parts of ordinary Portland cement, 1 to 20 parts of hardening accelerators, 0.002 to 0.1 part of plastic expansion agents, 0 to 2 parts of water reducing agents, 0 to 1 part of retarders, 0 to 1 part of thickening agents and 0 to 2 parts of anti-foaming agents. The grouting material provided by the invention has the technical characteristics of early strength, high strength, plastic period expansion, high construction flowability, no later stage shrinkage and the like; meanwhile, the industrial waste materials are greatly utilized; the product cost is reduced; the natural resources are saved.

Description

technical field [0001] The invention belongs to the field of construction engineering materials, and in particular relates to an early-strength high-strength non-shrinkage grouting material with a large amount of heavy slag. Background technique [0002] Blast furnace heavy slag is the solid waste slag produced in the process of smelting pig iron in the blast furnace, which is cooled slowly in the air or cooled by pouring an appropriate amount of water to form denser massive hard slag. With the rapid development of my country's iron and steel industry, a large number of abandoned blast furnace heavy slag has caused enormous pressure on the environment. Larger size slag can be melted and drawn to prepare mineral wool; others are processed, crushed and sieved into different particle sizes, which can be used as building materials instead of gravel. [0003] With the rapid development of my country's infrastructure, higher requirements are put forward for the use of grouting ma...

AI Technical Summary

Problems solved by technology

Most of the traditional grouting materials are made of ordinary portland cement as the cementitious material, the setting time is often more than 10 hours, and the daily strength is generally only about 20MPa, which cannot meet the requirements of rapid hardening and early strength such as rush repair, rush construction, and rapid construction.

Early-strength grouting materials are usually prepared by using early-strength sulphoaluminate cement plus hardening accelerator, ordinary portland cement composite aluminate cement or sulphoaluminate cement, etc. Patents CN201010034434, CN201510292426, CN201610103518 and CN201610781729 are all It has been introduced that the early strength of sulphoaluminate cement is relatively high, but the later strength tends to show different degrees of shrinkage, powdering and other phenomena will occur after long-term use, and phase transformation will occur under high-temperature environments, which restricts its wide range. Use; Aluminate cement can also improve the early strength and expansion of the grouting material by using it with gypsum, but there are problems such as low hourly strength and excessive fluidity loss, coupled with its high price, which limits its use

In addition, most of the grouting materials currently have the disadvantages of no expansion in the plastic period, low interface strength, and poor durability, and consume a large amount of increasingly scarce quartz sand resources.

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