In order to make the properties of ready-mixed mortar meet the requirements of specifications and construction, mortar admixture is an essential component. Magnesium aluminum silicate thixotropic lubricant and cellulose ether are commonly used as water retention thickener in mortar. Cellulose ether has good water retention, but there are many problems such as expensive price, high dosage, serious air entraining and resulting in greatly reduced strength of mortar. The price of magnesium aluminum silicate thixotic lubricant is low, but the water retention is lower than that of cellulose ether in the single mixing, so the drying shrinkage value of the prepared mortar is larger, and the bond is reduced.
Premixed mortar refers to wet mixed mortar or dry mortar produced by professional production plants. It has realized industrial production, ensured the stability of quality from the source, and has many advantages such as good operability, less on-site pollution, and effectively improving the progress of the project. Pre-mix (wet mix) mortar from the production point of transportation to the site for use, like commercial concrete, the performance of its higher requirements, to ensure a certain operational time, time in water after mixing, before the initial setting to have good enough workability, can carry out normal construction, operation.
The influence of the compound mixing of magnesium aluminum silicate thixotropic lubricant and cellulose ether on the consistency, delamination, setting time, strength and other properties of pre-mixed (wet mixed) mortar is as follows:
01
The mortar prepared without the addition of water retention thickener has high compressive strength, but poor water retention, cohesion, softness, bleeding is more serious, poor handling feel, and basically cannot be used. Therefore, the water-retaining thickening material is an essential component of ready-mixed mortar.
02
When magnesium aluminum silicate thixotropic lubricant and cellulose ether are mixed, the construction performance of mortar is obviously improved compared with blank mortar, but there are also some shortcomings. When magnesium aluminum silicate thixotropic lubricant is added, the amount of magnesium aluminum silicate thixotropic lubricant has a great influence on water consumption, and the water retention is lower than cellulose ether. When cellulose ether is mixed with cellulose ether, the mortar has better operable performance, but when the content of cellulose ether is high, the strength of mortar is greatly reduced, and the price is relatively expensive, which increases the material cost to a certain extent.
03
Under the condition of ensuring the performance of mortar in all aspects, the best dosage of magnesium aluminum silicate thixothixotic lubricant is about 0.3%, and the best dosage of cellulose ether is 0.1%. The dosage of the two mixtures is controlled in this proportion, and the comprehensive effect is good.
04
The ready-mixed mortar prepared by the compound mixing of magnesium aluminum silicate thixotropic lubricant and cellulose ether has good workability, consistency and loss, delamination, compressive strength and other performance indexes can meet the specification and construction requirements.
Classification and brief introduction of mortar
Mortar is mainly divided into ordinary mortar and special mortar two categories.
(1) ordinary dry mortar
A. Dry mortar: means dry mortar used in masonry works.
B. Dry mortar: refers to the dry mortar used for plastering works.
C. Dry ground mortar: refers to the dry ground mortar used for building ground and roof surface layer or leveling layer.
(2) special dry mortar
Special dry mortar refers to thin layer dry mortar, decorative dry mortar or has a series of special functions such as crack resistance, high bond, waterproof impermeable and decorative dry mortar. It includes inorganic heat preservation mortar, fight crack mortar, plastering mortar, wall ceramic tile bond agent, interface agent, caulking agent, color finishing mortar, grouting material, grouting agent, waterproof mortar.
(3) The basic performance characteristics of different mortars
Vitrified microbeads inorganic insulation mortar
Vitrified microspheres insulation mortar is hollow vitrified microspheres (mainly play the role of heat insulation) for light aggregate and cement, sand and other aggregates and all kinds of additives in accordance with a certain proportion of mixing and mixed for external and external thermal insulation of a new type of inorganic insulation mortar material.
Vitrified beads thermal insulation mortar has excellent thermal insulation performance and fire resistance to aging performance, not empty drum cracking, high strength, on-site construction and water mixing can be used. As a result of the pressure of market competition, stem from the purpose that reduces cost, enlarge sale, there also is partial enterprise on the market to use the light aggregate such as expandable perlite grain to serve as heat insulation material and allege vitrified bead, the quality of this kind of product is under true vitrified bead heat preservation mortar.
Anti-crack mortar Anti-crack mortar is made of anti-crack agent made of polymer emulsion and admixture, cement and sand in a certain proportion can meet a certain deformation and keep cracking mortar. It solves a big problem that has been perplexing the construction industry — the crack problem of light body insulation layer. It is a kind of high-quality environmental protection material with high tensile strength, easy construction and anti-freezing.
The mortar
Where daub in the building or building components of the surface of the mortar, collectively referred to as plaster mortar. According to the difference of plastering mortar function, can divide plastering mortar into common plastering mortar, decorative sand and the plastering mortar that has certain special functions (wait like waterproof mortar, adiabatic mortar, sound absorption mortar and acid-proof mortar). The plastering mortar is required to have good workability, easy to wipe into even and flat thin layer, convenient for construction. There should also be a higher bonding force, mortar layer should be able to bond firmly with the bottom, long-term without cracking or falling off. In a humid environment or vulnerable to external forces (such as the ground and skirt, etc.), but also should have high water resistance and strength.
Ceramic tile binder – ceramic tile glue
Ceramic tile binder, also known as surface brick binder, is made of cement, quartz sand, polymer binder with a variety of additives by mechanical mixing evenly. Ceramic tile binder is mainly used for bonding ceramic tile and face tile adhesive, also known as polymer ceramic tile bonding mortar. It completely solves the problem that there is no high-quality special adhesive material for ceramic tile, floor tile and other materials to choose in the adhesive construction, and provides a new reliable special adhesive product for ceramic tile for The Chinese market.
Caulking agent
Ceramic tile joint filling agent is the use of fine quartz sand, high quality cement, pigments, additives and other advanced production technology is precisely compounded, so that the color is more bright and lasting and wall brick coordination and unity, with beautiful and anti-seepage, anti-crack, mildew, anti-alkali perfect combination.
Grouting material
Grouting material is made of high strength material as aggregate, cement as binder, supplemented by high flow state, micro expansion, anti-segregation and other materials. Grouting material in the construction site to add a certain amount of water, mixing evenly can be used. Grouting material has good self-flow, fast hardening, early strength, high strength, no shrinkage, micro expansion; Non-toxic, harmless, non-aging, no pollution to water quality and the surrounding environment, good self-tightness, rust and other characteristics. In the construction of reliable quality, reduce the cost, shorten the construction period and easy to use and other advantages.
Grouting agent
Grouting agent by high-performance plasticizer, surfactant, silicon calcium micro-expansion agent, hydration heat inhibitor, migration type rust inhibitor, nano mineral silicon aluminum calcium iron powder, stabilizer refined from the grouting agent or refined with low alkali low heat Portland cement and other composite. With micro expansion, no shrinkage, large flow, self-compaction, very low bleeding rate, high filling degree, bag foam layer thin diameter, high strength, rust resistance, low alkali chlorine free, high adhesion, green excellent performance.
Decorative mortar – colored finish mortar
Color decorative mortar is a new kind of inorganic powder decorative material, which has been widely used in the interior and exterior decoration of buildings in developed countries instead of coating and ceramic tile. Color decorative mortar is made of polymer material as the main additive, and refined with high quality mineral aggregate, filler and natural mineral pigment. Coating ply is in commonly 1.5 ~ 2.5 millimeter between, and ply of lacquer face of common emulsive paint is 0.1 millimeter only, because this can obtain extremely good simple sense and stereo adornment effect.
Waterproof mortar
Waterproof mortar is made of cement, fine aggregate as the main material and polymer as the modified material. It is made of mortar with certain impermeability according to proper mix ratio. Guangdong is now in compulsory promotion, the market will slowly rise.
Ordinary mortar
It is made by mixing inorganic cementitious materials with fine aggregate and water in proportion, also known as mortar. For masonry and plastering engineering, can be divided into masonry mortar, plastering mortar and ground mortar, the former is used for brick, stone, block and other masonry and component installation; The latter is used for metope, ground, roof and beam column structure and other surface plastering, in order to achieve protection and decoration requirements.
Post time: Jun-07-2022