Bed mortar for low-temperature fabricated building and preparation method of bed mortar

Abstract

The invention discloses bed mortar for a low-temperature fabricated building and a preparation method of the bed mortar, and belongs to the technical field of building materials. The bed mortar comprises the following raw materials: 5 to 15 weight percent of ordinary cement, 15 to 50 weight percent of special cement, 35 to 50 weight percent of aggregate, 3 to 15 weight percent of a mineral admixture, 0.01 to 1 weight percent of a plastic expansion component, 1 to 10 weight percent of an expanding agent, 0.05 to 1 weight percent of a thickening time control agent, 0.05 to 5 weight percent of an antifreezing agent, 0.1 to 5 weight percent of a construction performance improver and 0.01 to 1 weight percent of an additive; the plastic expanding agent is powder particles prepared by adding an azo compound and lead sulfate tribasic into absolute ethyl alcohol, stirring and drying; and the thickening time control agent is a powder particle with a 'glue pudding' structure, which takes a retarder as a shell and an early strength agent as an inner core. The plastic expansion component and the thickening time control agent are prepared from specific raw materials by a specific preparation method, so that the working performance of the bed mortar for the prefabricated building at -5 DEG C is effectively improved, the mechanical strength of the mortar is improved, shrinkage in a plastic stage is effectively compensated, all materials and facilities do not need to be heated in the construction process, and the construction part does not need sealing, heating and heat preservation measures.

Description

technical field [0001] The invention belongs to the field of building materials, in particular to seat mortar for low-temperature prefabricated buildings. Background technique [0002] As a building form that is currently being vigorously developed, prefabricated buildings are expected to become one of the mainstream building forms in the future. The prefabricated building has the characteristics of green, environmental protection, convenient and quick construction. With the continuous promotion of prefabricated buildings, the steel sleeve grouting connection technology has also been highly recognized by all walks of life. As a connecting material, prefabricated buildings use seat mortar, which is mainly used for prefabricated components. Edge banding treatment of the gap between the bottom plates, separate warehouse construction, and slurry sitting method construction. The newly implemented national standard JG / T 408-2019 "Sleeve Grouting Material for Rebar Connection" cl...

AI Technical Summary

Problems solved by technology

However, the above-mentioned application methods of these existing patented technologies are all used for steel sleeve grouting materials, not for seam sealing edge banding of prefabricated buildings

Images