Outer-wall external thermal-insulation anti-crack mortar prepared from superfine sand

Abstract

The invention discloses an outer-wall external thermal-insulation anti-crack mortar prepared from superfine sand. The outer-wall external thermal-insulation anti-crack mortar consists of the following ingredients in parts by weight: 25-35 parts of cement, 62-72 parts of superfine sand with fineness modulus of 0.5-0.6, 1.0-3.0 parts of shrinkage reducing agent, 0.2-0.4 part of polymer modifier, 0.1-0.3 part of water-retaining agent, and 0.05-0.15 part of fiber. When the outer-wall external thermal-insulation anti-crack mortar is in use, all the ingredients are mixed with water added in a certain ratio as required on site and are stirred uniformly. Proven by experiments, the outer-wall external thermal-insulation anti-crack mortar has the advantage of solving the technical problems such as serious shrinkage and poor construction performance obstructing the use of the superfine sand with fineness modulus of 0.5-0.6 in the anti-crack mortar; and the anti-crack mortar with the ratio of compressive strength reaching 1.90, the bonding strength reaching 1.0MPa and long operational time reaching 2h is prepared and the anti-crack mortar meets the technical requirements of JG158-2004 ETIRS (external thermal insulation rendering systems made of mortar with mineral binder and nsing wxpanded polystyrene granule as aggregate) on the anti-crack mortar.

Description

technical field [0001] The invention relates to a construction mortar, in particular to an external thermal insulation and anti-cracking mortar for external walls prepared with superfine sand. Background technique [0002] With the deepening of the promotion and application of energy-saving buildings, external wall insulation systems have been widely used. Due to the large changes in the ambient temperature and humidity of the external wall thermal insulation system, large self-shrinkage, or improper construction methods, it is easy to cause hollowing, cracking, and falling off of the external thermal insulation layer of the external wall, thereby causing wall leakage. , ventilation, peeling and other issues. One of the most effective ways to solve this problem is to wipe the anti-crack mortar on the basis of the insulation layer. At present, the main measures to overcome the crack resistance of the insulation layer include the use of fibers to enhance the crack resistance...

AI Technical Summary

Problems solved by technology

[0005] In view of this, the object of the present invention is to provide an anti-cracking mortar for external thermal insulation of external walls prepared with ultrafine sand, which can not only solve the problems of large shrinkage, easy cracking and falling off of the mortar prepared with ultrafine sand, but also water retention and slowing down. Good coagulation, easy construction