Various problems may arise during dry-mix mortar construction. What are the common ones? What is the solution? Landcel will tell you.

1. Why do air bubbles appear soon after the dry-mixed mortar is plastered?

1.1 Reason analysis:
1.1.1 Mortar admixture or water-retaining thickening material has poor adaptability to cement. Causes the reaction to generate bubbles.
1.1.2 The sand fineness modulus of the raw material of the mortar is too low, or the particle gradation is not good, resulting in too high porosity and air bubbles.

1.2 Preventive measures:
1.2.1 Strengthen raw materials, especially admixtures and water-retaining thickening materials and cement adaptability tests. It can be used for production after passing the test.
1.2.2 Reasonably adjust the particle gradation and various indicators of the sand. Ensure that the mortar is qualified to leave the factory.

2. Why does the dry-mixed mortar have different strengths and colors in the same batch of test blocks?

2.1 Reason analysis:
Due to insufficient supply of production materials. Different kinds of cement and fly ash were used in the same project. It leads to changes in the properties of mortar such as water demand and setting time, resulting in differences in strength and color.
2.2 Preventive measures:
2.2.1 Production enterprises should make material preparations in advance for large quantities. Prevent the occurrence of material outage problems during production.
2.2.2 Ready-mixed dry-mixed mortar It is strictly forbidden to use two kinds of cement or fly ash in the same construction site.

3. Why is the setting time of dry-mixed mortar unstable and short?

3.1 Cause analysis:
3.1.1 The setting time of mortar is too short: Due to the high external temperature, large water absorption of the substrate, and low water retention of the mortar, the setting time is shortened, which affects the operation.
3.1.2 The setting time of mortar is too long: the setting time is too long due to season, weather change and excessive admixture, which affects the operation.

3.2 Preventive measures:
3.2.1 Strictly control the dosage of admixtures. Adjust the type and amount of admixture according to different seasons, different weather, and different wall materials.
7.2.2 Strengthen the on-site inspection to understand the construction information in a timely manner.

4. Why does the dry-mixed mortar appear abnormal and not condense?

4.1 Cause Analysis:
The metering of the admixture is out of control. As a result, the mortar is mixed with water and segregated, the consistency is obviously too large, and it does not condense.
4.2 Preventive measures:
strengthen measurement inspection and maintenance. Prevent a part from getting out of control. Strengthen the sense of responsibility of operators and quality inspectors, and resolutely prevent unqualified products from leaving the factory.

5. Why does the dry-mixed mortar have bleeding, segregation, and white film on the surface when it is left standing?

5.1 Cause analysis:
5.1.1 The mixing time of the mortar is too short, and too little water-retaining material is added, resulting in too low water retention.
5.1.2 The gradation of sand particles is not good, and the workability of mortar is too poor.
5.1.3 The quality of cellulose ether is poor or the formula is unreasonable.

5.2 Preventive measures:
rational use of additives and raw materials. Do a good job of trial mixing of different raw materials and adjust the formula in time.

Landcel’s cellulose ether products HPMC, HEMC, HEC, EHEC are suitable for dry-mixed mortar. It can effectively solve some construction problems of dry-mixed mortar. Welcome to consult and order.