Has cement mortar been replaced by gypsum mortar?

The mortar products used by many of our customers are basically using gypsum as filler. Because the traditional cement mortar generally uses manual plastering construction mainly, its construction links are complicated, the site environment is dirty, the landing ash is much, low efficiency, and later on, it also needs a lot of manpower to complete the maintenance, and all of these jobs are required to be completed by skilled workers. Plastering plaster can be made thinner than cement mortar on the same deviation wall surface, which is at least 5 times less than cement mortar in terms of unit square metre dosage, plus its coating rate is far more than that of cement mortar, and the workers can do 2 times more work in a day. If machine-sprayed lightweight plastering plaster is used, the loading efficiency is more than 3 times that of manual work, which can further improve the construction speed and shorten the construction period!

Advantages and disadvantages of cement mortar

Advantages of cement mortar: good compatibility, strong adhesion, high strength after the mortar layer is hardened, the surface is not easy to be scratched, and the cost is more affordable.
Disadvantages of cement mortar: need to be strictly in accordance with the proportion of materials, strict requirements on the construction process, otherwise it is easy to appear hollow drum, cracking and other problems.
Cement mortar in construction, the grass-roots level should be kept flat, dense, no unevenness, no sand. In addition, during the construction of cement mortar, the grassroots must be watered one day in advance, in order to make the surface more moist, so that the surface layer and the grassroots become more solid. Cement mortar in the construction process, must choose mechanical mixing, but also pay more attention to the proportion of sand and other dosage, especially the amount of water added, pay special attention to its mixing time, can not be less than 2 hours, otherwise it will lead to uneven mixing of cement mortar, affecting the construction quality.

Advantages and disadvantages of gypsum mortar

Advantages of gypsum mortar: strong bonding force Due to the addition of a variety of polymers, its water retention is good. Plaster plaster can bond well with almost all kinds of wall substrates, and the effect is especially obvious for aerated concrete walls, and there is no need to brush any interfacial agent when plastering. As plaster plaster has micro-expansion, it can effectively inhibit the shrinkage and cracking phenomenon of plaster, and the wall plaster layer will not appear hollow drum, cracking, and peeling phenomenon.
Disadvantages of gypsum mortar: very poor strength, easy to bruise in the later decoration, and the mortar is not water-resistant, not drainage, in a humid environment, it is easy to appear mouldy.
Gypsum mortar is mainly used for wall levelling, fast solidification, and cement mortar to reach the strength of one month after the comparison, so it is very suitable for projects in a hurry, but also eliminates drums and cracking, reducing the chance of rework.

Comparison between cement mortar and gypsum mortar

Gypsum is a kind of solid waste after power generation, and also need to combine with the actual situation of foreign local judgement, so it does not say that gypsum-based comprehensively replace cement-based. Cement-based is still widely used in crack-resistant plastering mortar and traditional thermal insulation mortar.

Difference in performance

Thermal insulation performance

The thermal insulation performance of gypsum-based thermal insulation mortar is poor, mainly suitable for indoor thermal insulation in mild climate, not suitable for external thermal insulation. Cement-based thermal insulation mortar, on the other hand, has better thermal insulation performance and is more widely used in external wall insulation.

Anti-cracking performance

The anti-cracking performance of cement-based thermal insulation mortar is better than that of gypsum-based thermal insulation mortar, especially in environments with large temperature changes, such as low temperatures in winter and high temperatures in summer in the northern region. Therefore, cement-based thermal insulation mortar is more superior in external wall insulation.

Fireproof performance

Since gypsum itself is flammable, the fireproof performance of gypsum-based thermal insulation mortar is poor. While cement-based thermal insulation mortar can improve the fireproof performance by adding fireproof materials.

Difference in use

Gypsum-based thermal insulation mortar is mainly used for indoor wall and roof insulation, while cement-based thermal insulation mortar is suitable for both indoor and outdoor thermal insulation projects, especially in the most widely used external insulation.

Difference in construction

Usage

Gypsum-based thermal insulation mortar generally needs to be mixed with expanded perlite after adding water, while cement-based thermal insulation mortar needs to be mixed with cement.

Construction temperature

Gypsum-based thermal insulation mortar requires a high construction environment temperature, and should not be constructed under low temperature conditions. Cement-based thermal insulation mortar requires relatively low construction environment temperature, and can be constructed at room temperature.

Construction thickness

The construction thickness of gypsum-based thermal insulation mortar is usually not more than 5cm, while the construction thickness of cement-based thermal insulation mortar can reach more than 10cm.

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