A kind of lime-based micro-shrinkage grouting material composition and preparation method thereof

Abstract

The invention discloses lime-based micro-contraction grouting material composition and relates to the technical field of materials for brick and stone historical relic protection. The composition is prepared from components in percentage by weight as follows: 30%-60% of aggregate, 30%-60% of natural hydraulic lime, 3%-9% of an expanding agent, 3%-8% of active micropowder and 0.8%-1.6% of an auxiliary. The micro-contraction grouting material has good compatibility with traditional brick and stone materials in physical and chemical property as well as relatively high strength, besides, micro volume expansion can be produced after the grouting material is poured into gaps due to reasonable introduction of the expanding agent, so that the grouting material can be closely combined with bricks and stone serving as a base material, and more compact grouting is realized.

Description

technical field [0001] The invention relates to the technical field of materials for protecting masonry cultural relics, in particular to a lime-based micro-shrinkage grouting material composition and a preparation method thereof. Background technique [0002] Masonry cultural relics (including petroglyphs, stone or clay sculptures, inscriptions, etc.) and historical buildings are an important part of Chinese culture, but under the influence of various natural factors and human activities, they will also appear aging and hollow. , Peeling, damage, breakage and missing problems require continuous maintenance, repair and protection. In these protection projects, corresponding protective materials are required for bonding fractured components, filling hollow and damaged parts, and strengthening the structure of cultural relics. [0003] Among them, the bonding and strengthening of masonry materials with cracks or cavities generally requires the use of perfusion bonding materia...

AI Technical Summary

Problems solved by technology

Both have their own characteristics. Cement materials are widely used in the engineering industry due to their high bond strength, excellent anti-aging and moisture-proof and impervious properties. However, a large number of scientific research and engineering examples show that modern cement materials are different from traditional masonry. Incompatibility with similar materials, cement contains a large amount of water-soluble salt, which will seriously damage masonry materials; secondly, once a problem occurs in a cement building, it is very difficult or even impossible to repair it again

However, lime-based grouting materials also have defects, such as low strength, slow setting speed and easy shrinkage, so that the filling reinforcement effect is difficult to meet the requirements

[0007] The Chinese invention patent with application publication number CN 101811853 discloses a pouring adhesive material composition, which contains natural hydraulic lime with a weight ratio of 20-60%, 35%-78% aggregate, 0%-0.2 % polymer latex powder, 0.01%~2% water reducing agent and 0.01%~2% water-retaining thickener, which can meet the special protection requirements for bonding and strengthening masonry materials in historical buildings, with excellent adhesion , good weather resistance and self-healing, the problem is that although the shrinkage rate has been improved, it is still too large, and the reduction in strength caused by shrinkage has become a technical bottleneck for further improving the bonding strength of the pouring material

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