Levelling mortar and ground construction process based on the same

Abstract

The invention relates to a levelling mortar, comprising ingredients of, by weight, 20-30% of rapid hardening sulphoaluminate cement, 3-5% of ordinary portland cement, 3-5% of anhydrite, 30-40% of silica sand, 20-30% of calcium carbonate, 0.1-0.3% of water reducing agent, 0.02-0.1% of thickening agent, 0.02-0.1% of early strength agent, 0.1-0.8% of coagulation accelerator, 0.1-0.3% of retarder, 0.1-0.3% of antifoaming agent, 0.5-2% of shrinkage reducing agent, and 0.5-2% of redispersible emulsion powder. The invention also relates to a ground construction process based on the levelling mortar specified in the patent claim 1. The technology comprises steps of: (1) carrying out a base ground surface treatment; (2) finding out a highest point on the ground; (3) coating an interface agent; (4)setting horizontal control points; (5) setting levelling mortar casting segmenting plates; (6) stirring the levelling mortar; (7) casting the levelling mortar; (8) repeating the step (5), (6) and (7); (9) segmenting a work surface; (10) maintaining. The levelling mortar of the present invention and the construction process thereof have advantages of an accurate and controllable construction thickness of a levelling layer, convenient operation, small amount of material usage and high ground flatness after construction.

Description

technical field [0001] The invention belongs to the field of indoor ground construction materials and techniques, in particular to a leveling mortar and a ground construction technique based on the leveling mortar. Background technique [0002] At present, the most commonly used method for indoor ground leveling is to use a certain proportion of cement mortar for plastering construction, and the construction thickness is 40mm-50mm. After the mortar is spread, use a scraper to level the mortar. Ordinary mortar ground leveling is not ideal, the surface of the mortar is easy to sand, and the flatness is not ideal; moreover, due to the thickness of the mortar layer, not only waste of construction materials such as cement and sand, but also increase the weight of the ground, and at the same time It also reduces the indoor height and reduces the effective use of indoor space. [0003] At present, there is also self-leveling cement mortar on the market. When it is used for levelin...

AI Technical Summary

Problems solved by technology

The main disadvantage of this kind of self-leveling mortar is that the volume stability is not ideal, and it is not suitable for the construction process with large thickness. When the construction thickness is large, hollowing and cracking are easy to occur.

Another kind of self-leveling mortar uses gypsum as the cementitious material. The biggest disadvantage of this kind of self-leveling mortar is that the water resistance of the material is not good. When soaked in water, the strength of the self-leveling mortar decreases significantly, and it is easy to bulge and fall off.