Among the quality problems of construction projects, wall cracks are a very common phenomenon. Mainly based on site experience, detailed observation and analysis of the site plastering process, starting from the quality of materials, detailed analysis of the causes of cracks in cement mortar plaster walls on the analysis, combined with their own practical experience, put forward the corresponding solution strategy, I hope that the relevant engineering and technical personnel can learn from.

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With the continuous improvement of people's quality of building decoration, many existing decoration projects quality has not been able to meet the needs of the occupants, especially the frontal cracks formed during the cement mortar plastering operation. Wall cracks seriously affect the appearance of buildings. At the same time, long-term cracks are subject to rainwater intrusion, causing damage to the overall structure of the building, affecting the stability of the concrete walls and posing a major safety threat to the structure of the building.

This paper analyses the causes of cracks in cement mortar plaster walls, and then combines its own engineering practice. The preventive measures are elaborated in depth, hoping to give reference and reference to relevant engineering technicians.

Causes of cracks

1. Use of unqualified materials

Cement is the main raw material for cement mortar plastering. Due to the rapid development of China's construction industry and the shortage of the cement market, many cement producers start to make large production reserves for the following year's cement sales after the peak season. The warehouse storage time takes more than half a year, reducing the strength of the cement material and easily leading to substandard quality. 

For Drymix Mortar

If cement materials cannot be inspected in depth before entering the construction site, this can easily result in substandard quality, causing problems with the quality of the cement mortar, reducing its strength and being an important factor in causing cracking in plastered walls. Choose the right HPMC could provide the greatest bond strength of mortar.

2. The amount of sand in the cement is not qualified

If the sand used in cement mortar plastering is less than 3mm in diameter, or if the cement mortar containing too much mud is used, it will fill the pores of the cement material, making it impossible for the cement mortar to connect with the aggregate accordingly. The reduction of the cohesion of the aggregate in the material will lead to cracks on the surface of the cement mortar. HPMC have good consistency, non-sagging property could make the work easier during using of distribution method.

3. Incorrect calculation of the cement mortar mix ratio

During the construction process, the cement mortar ratio needs to be configured in accordance with the specifications. If the construction personnel cannot operate correctly according to the standard specification, the cement dosage will be inaccurate; if the heat of hydration of cement is relatively large, the corresponding temperature stress will be generated. If the strength of the cement mortar is low, its cohesion will be reduced, resulting in cracks on the surface of the cement mortar.HPMC have good water retention, make sure all other additives can also reach the best performance.

Let us help you find the best construction grade HPMC wholesale. Welcome to contact us today or visit our website to learn more about HPMC for Drymix Mortar.