Structural strengthening sprayable mortar composition and preparation process thereof

Abstract

The invention discloses a structural strengthening sprayable mortar composition and a preparation process thereof. The mortar composition includes 16% to 21% of 42.5-grade ordinary Portland cement, 1% to 4% of active volcanic ash, 71.75% to 82.4% of quartz sand, 0.05% to 0.2% of a thickening and water-retaining component, 0.5% to 3% of a coagulation-promoting component and 0.05% of crack resistant fiber special for mortar. According to the invention, construction thickness of single spraying on a vertical surface of a structural element with a spraying mortar machine reaches 30 to 40 mm, and construction thickness of single spraying on the top surface of the structural element is about 20 mm; when spraying construction is finished, the vertical surface and the top surface of the structural element are subjected to moist curing for merely one day or two days, and then mechanical properties of a surface layer of mortar and normal increase of positive tensile bonding strength between the surface layer of mortar and a substrate can be guaranteed. Cost for the composition provided in the invention is low, and the composition is easy to apply on a large scale and has the advantages of stable performance, long-term storage, convenient transportation and usage, etc.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a sprayable mortar composition for structure reinforcement with excellent on-site construction performance, hanging performance and water retention performance and a preparation process thereof. Background technique [0002] From the 1950s to the 1990s, my country built a large number of factory buildings, public buildings and office buildings with reinforced concrete and brick structures. These buildings have been used for 20-30 years. Due to improper maintenance or construction quality, many houses have potential safety hazards in different structures, some of which are quite serious and endanger the safety of the structure. Due to the large investment in civil engineering, although there are problems in the building itself, it is not demolished and rebuilt. Instead, the method of structural reinforcement is used to repair and reinforce with a small amount of inves...

AI Technical Summary

Problems solved by technology

Therefore, when the structural reinforcement facade and top surface need to be reinforced with thick layers due to design requirements, multiple layered constructions are required, thereby increasing labor time and labor intensity

In addition, the wet curing time of the component reinforcement layer is also an important aspect that affects the construction quality and construction continuity. Considering that the mortar itself is easy to cause water loss due to the porous structure, in order to ensure the normal development of the mortar strength in actual projects, maintain the project quality. , the construction site needs to moisten and maintain the component reinforcement layer for 7 days. Therefore, it greatly affects the construction progress and the continuity with the later decorative construction of the component reinforcement layer

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