- July 30, 2021
- Posted by: admin
- Category: News
Masonry mortar is an indispensable and important part of a building. Only when the bonding quality is fully guaranteed can a building be constructed and stabilized. There are many factors that affect the strength. If any of the materials in the mix ratio is insufficient, or the composition is not enough, it will affect the overall quality. Only by mixing mortar, cement, sand and water in different proportions can the strength grade standard be produced. When matching the materials, it is necessary to grasp the material specifications, quantity, model, etc., so that different materials form a certain mixture according to a specific ratio. The sand dosage in the masonry mortar mix ratio is mainly adjusted continuously according to each strength grade. If the strength grade is different, it needs to be adjusted in time for each cubic meter of mortar sand to ensure that the dosage meets the design standards, meets the construction needs, and saves construction costs.
The amount of cement is also proportional to the strength of the mortar grade. The low-strength grade mortar uses less cement and the high-strength grade mortar uses more cement. This is proven through practice. To get a good mortar, you need to select a certain amount of cement and dry sand, and then add appropriate water for mixing, so that the mortar for construction can be formed. At this time, the volume of the mortar will be reduced by about 10%; usually, The higher the strength level of the mortar, the more cement is used, and the volume will increase when the cement is mixed into the mortar.
The control of the unit water consumption is also directly related to the strength. The unit water consumption affects the fluidity of the mortar. Only the mortar with qualified water consumption can ensure that the mortar has a moderate consistency and meet the basic requirements of construction. The mixing ratio of masonry mortar is mainly the ratio of lime to sand. Only when the amount of cement and sand are fully grasped, and the ratio of the two are used, can high-strength construction materials be matched to ensure the quality of construction.
Matters needing attention when choosing cement dosage Reasonable and scientific use of cement is the prerequisite to ensure the quality of mortar. The amount of cement is mainly changed with the strength level of the mortar. The amount of cement can only be determined if the mortar level is determined first. The two are interrelated, that is, the higher the strength level of the mortar. , The more cement is used, and vice versa, the less. Choose the amount of cement and follow the principle of less cement, so as to further increase the water retention rate of the mortar, effectively improve the water retention performance of the mortar, avoid brickwork cracking, and fundamentally ensure the construction quality. The thickness of sand also has a direct effect on the amount of cement. The smaller the fineness, the greater the mud content. The sand fineness modulus is between 2.3 and 3.0 to ensure that the mud content of the mortar is less than 5%. Medium sand is an ideal material for masonry mortar. Fine sand or extra-fine sand cannot be used to avoid insufficient adhesion and affect construction quality.