Why does the dry-mixed mortar agglomerate, form agglomerates, and the strength is unqualified?
What is the reason for this phenomenon? What is the solution? Landcel will tell you:
3. Why does the dry-mixed mortar agglomerate and form agglomerates on the construction site, and the quality declines?
3.1 Reason analysis:
3.1.1 The moisture content of the raw material sand of the mortar production enterprise does not meet the sand drying requirements. The mixing time of the mortar is too short, and the mixing is uneven.
3.1.2 Mortar manufacturers use irregular raw materials.
3.1.3 The construction company failed to clean up the dry-mixed mortar silo and mixer in time according to the construction requirements of ready-mixed dry-mixed mortar.
3.2 Preventive measures:
3.2.1 Mortar production enterprises should formulate a strict quality management system, formulate quality policies and quality objectives, and establish organizational structures. Strengthen production process control and raw material testing.
3.2.2 Mortar manufacturers should provide on-site services, introduce product features and provide product manuals to ensure project quality.
3.2.3 The construction company shall take measures to improve the quality responsibility of the mortar project, and the dry-mixed mortar silo shall be maintained and cleaned by special personnel.
4. Why does the dry-mixed mortar fail to pass the test block, the strength fluctuates, the dispersion is too large, and the strength judgment is unqualified, while the same mix ratio of the same part at the same time in other construction sites is all qualified and the dispersion is small?
4.1 Reason analysis:
4.1.1 The construction unit failed to pass the test, and the error of the test piece itself was too large, and the diagonal error of some test molds was greater than 3mm, so there was a problem that the error of the test piece was too large.
4.1.2 The roughness of the test piece does not meet the relevant specifications. And no standard maintenance has been carried out.
4.1.3 The test piece itself is unqualified. And the force-bearing area does not meet the requirements, resulting in local compression and low strength.
4.2 Preventive measures:
4.2.1 It is recommended that the experimental personnel of the construction unit carry out technical training to learn the relevant experimental standards and specifications.
4.2.2 Replace the unqualified test mold, and strengthen the monitoring of the used test mold. And resolutely use it if it does not meet the requirements.