High-performance durable natural hydraulic lime mortar for reinforcing and repairing rock and soil buildings and preparation method thereof

Abstract

The invention relates to high-performance durable natural hydraulic lime mortar for reinforcing and repairing rock and soil buildings and a preparation method thereof and belongs to the field of modified research of building materials and preservation materials of cultural relics. The mortar is prepared by partially replacing a main body cementing material natural hydraulic lime (NHL2) by silica fume and adding a certain amount of isobutyl triethoxy silane. The mortar prepared by the method has the characteristic of being light. The total amount of raw materials required for preparing the mortar in same volume, in particular the dosage of the natural hydraulic lime, is reduced. Both the water absorption and volume shrinkage of the modified mortar are reduced, and the service performance of the mortar is improved. The inner porous structure of the mortar is refined, and the mechanical strength is improved. The mortar can be applied to repairing buildings with higher strength designs. The preparation method improves the freeze-thaw resistance, acid corrosion resistance and salt expansion resistance of the mortar to a great extent, so that the mortar can better exert reinforcing and repairing effects.

Description

Technical field [0001] The invention relates to a natural hydraulic lime mortar and a preparation method thereof, in particular to a high-performance durable natural hydraulic lime mortar for the reinforcement and restoration of rock and soil buildings and a preparation method thereof. It belongs to the research and development field of building materials and cultural relic protection materials modification. Background technique [0002] The use of hydraulic mortar has a long history. With the discovery of hydraulic binding materials in the 18th century, air-hardening lime was gradually replaced by hydraulic lime. At the beginning of the 20th century, Portland cement became the most important building material due to its fast hardening speed and high mechanical strength, which reduced the application of hydraulic lime. In recent years, due to the strength characteristics of hydraulic lime that can meet the lower strength requirements of certain building structures and its super...

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Problems solved by technology

At present, there is no report on the use of low-density silica fume to replace part of the natural hydraulic lime modified mortar, and there is no report on the use of silane substances to improve the durability of natural hydraulic lime mortar

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