Modified shell ash mortar and preparation method thereof

Abstract

The invention discloses modified shell ash mortar and a preparation method thereof, belonging to building materials. The modified shell ash mortar is prepared from the following components in parts bymass: 0.6 to 0.8 part of shell ash paste, 0.15 to 0.35 part of mineral powder, 0.05 part of silica fume, 2.5 parts of sand and 0.2 to 0.3 part of tap water. The preparation method comprises the following steps: pouring oyster shell ash into a large plastic barrel, adding 3-4 times of water for curing, carrying out uniform stirring, precipitating, and aging to obtain shell ash paste for later use;fishing out the aged shell ash paste, determining the consistency value of the shell ash paste and adjusting the consistency value of the shell ash paste to be within a range of 120 mm +/- 5 mm; weighing the raw materials according to the mass ratio; sequentially adding the sand, the mineral powder and the silica fume into a mortar mixer for uniform and dry mixing for at least 1 min, then addingand stirring the shell ash paste and water for at least 3 min, and conducting uniform mixing so as to obtain the mortar. The mortar is high in setting and hardening speed, high in strength, binding power and elasticity modulus, good in weather resistance, small in shrinkage deformation and stable in size, and has good compatibility and high matching degree with masonry of historical buildings.

Description

technical field [0001] The invention relates to building materials, in particular to a modified shell ash mortar used for reinforcement and restoration of cultural relics buildings and historical buildings with traditional features and new buildings with traditional features and a preparation method thereof. Background technique [0002] Lime is one of the earliest inorganic cementitious materials used by humans. It is compatible with masonry materials of historical buildings and will not cause secondary damage to historical buildings. It has irreplaceable advantages in the field of historical building restoration. Lime mortar can be well matched with masonry, which not only avoids the problems of easy aging and short service life of organic repair materials such as polymer grout, grout, and polymer mortar, but also avoids the use of cement-based mortar for repair. The problem of obvious color difference and high strength caused by the time, and the matching between the two ...

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Problems solved by technology

[0025] The purpose of the present invention is to solve the performance defects of traditional shell ash mortar such as slow setting and hardening, low hardening strength, large shrinkage deformation and poor weather resistance, to provide the same appearance as

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