Mortar appearance quality problems

Dry mortar equipment
A. Mortar appearance quality problems

1. The surface of the mortar is rough after plastering, no pulp or uneven after plastering

Analysis of the causes: too many large particles in the aggregate (sand) in the raw material of ready-mixed mortar, the fineness modulus is too high, which leads to less slurry and cannot be polished.

Preventive measures: adjust the particle gradation of the aggregate in the mortar and increase the amount of powder appropriately.


2. Mortar plastering after the appearance of skin, powder, sand phenomenon

Analysis of the causes: the peeling and powdering is mainly due to the mortar used in the raw material sand fineness modulus is too small, the amount of admixture is too much, the construction of excessive calendering leads to part of the powder

The reason for falling sand is not only that the modulus of sand fineness is too small, but also that the mud content of sand is excessive, and the proportion of cementing material is low, which leads to part of the powder falling and peeling.

The proportion of materials is low, which leads to part of the sand floating out of the surface and sanding.

Preventive measures: strict control of sand fineness modulus, particle gradation, mud content and other indicators, increase the cementitious materials, timely adjustment of the formula, adjust the proportion of materials and add

The construction process and maintenance measures should be taken into account.


3. Hollow drum, shedding, penetration and other problems after mortar hardening

Analysis of the causes: poor quality management of the production enterprise, production control is not in place resulting in mortar product quality problems; construction enterprises construction quality is poor, not in strict accordance with

The problem is caused by the poor construction quality of the manufacturing enterprise, which does not strictly follow the requirements of the construction specification; the mismatch between the interface agent, binder and dry mortar used in the wall interface treatment; the temperature change leading to the expansion or shrinkage of the building material; and the problem of the wall interface treatment.

The wall itself is cracked.

Preventive measures: Mortar production units should improve their measures and responsibilities for mortar quality management, while construction enterprises should also improve their measures and responsibilities for mortar project quality.

Both sides should jointly train the production technology construction personnel of key operation points with relevant business skills knowledge.


4. Mortar plastering after the sticky, easy to fall off

Cause analysis: mortar and ease is too poor, bonding force is too low; construction party a plastering too thick, plastering time interval is too short; substrate interface treatment is not appropriate.

Preventive measures: adjust the formula according to different raw materials and different substrates to increase the bonding force; suggest that the construction of the plaster in layers, the total thickness should not exceed 20mm, and pay attention to control

Good time of each process; good interface treatment, especially some new wall materials, to use special matching mortar.