The material principle of masonry mortar masonry mortar is an indispensable part of the building, only to ensure the overall quality of bonding, building and stability. There are many factors that affect the strength. If any material in the mix ratio is insufficient, or the composition is insufficient, it will affect the overall quality, in order to produce the material of strength grade standard, it is necessary to grasp the material specification, quantity, model and so on, so that different materials can be mixed in a certain proportion. The amount of sand used in the mix ratio of masonry mortar is adjusted continuously according to the strength grades. If the strength grades are different, it is necessary to adjust the amount of sand for each cubic meter of mortar in time to ensure that the amount of sand meets the design standards, to meet the needs of construction, saving construction costs. It is proved by practice that the amount of cement used in low-strength mortar is less than that in high-strength mortar. To get good mortar, we need to cement and dry sand through a certain amount of selection, and then add appropriate water to mix, so as to form a construction mortar, mortar volume will be reduced by about 10% ; Generally, the higher the strength grade of mortar, the more the amount of cement used, cement mixed into mortar will increase the volume. The amount of water per unit affects the fluidity of mortar. Only the mortar with qualified amount of water can ensure the moderate consistency of mortar and meet the basic requirements of construction. The mixture ratio of masonry mortar is mainly lime-sand ratio. Only when the amount of cement and sand is fully controlled, and the proportion of both can the high-strength construction materials be matched to ensure the construction quality.
The reasonable and scientific use of cement is the precondition to guarantee the quality of mortar. The amount of cement is changing with the strength grade of mortar, to determine the amount of cement, the two are interrelated, that is, the higher the strength grade of mortar, the more the amount of cement, and vice versa. Choosing the amount of cement and following the principle of less amount of cement can further increase the water-holding ratio of mortar, effectively improve the water-holding performance of mortar, avoid cracking of brick masonry, and fundamentally ensure the quality of construction. Sand fineness also has a direct effect on the amount of cement, the smaller the fineness, the larger the mud content, sand fineness modulus between 2.3 ~ 3.0, to ensure that the mud content in mortar mix ratio is less than 5% . The medium sand used in masonry mortar is an ideal material. It can not use fine sand or extra fine sand to avoid insufficient adhesion and affect the quality of construction.
The concrete measures to control cement consumption can achieve the goal of high quality construction only if the process is reasonable. Cement dosage control is the key to ensure the mix ratio of masonry mortar. One is the use of weighing scale cement weight, through fine measurement, effectively ensure the amount of cement, so that the concentration of cement is controlled, usually the amount of cement control in 2% . Second, the construction site must use high-precision consistency meter, effective analysis of the amount of various mortar materials to determine the appropriate proportion. The third is to limit the cement mixing time. To strictly set the time, to meet the mixing time of not less than 2 minutes of the standard, in the mixing process, the need to control the speed, impurities to remove, to avoid excessive lime blocks affect the strength. After mixing, some materials need to be used as early as possible, so as not to affect the overall strength. Fourth, the rational use of additives. If you want to use additives, you need to strictly follow the standards, there must be strict testing, there are scientific parameters to support. Fifth, to meet the actual needs. Different construction projects, the standard of mortar is different, according to the site construction situation, reasonable adjustment of cement consumption, effective adjustment of mix ratio, because the mix ratio is not fixed, according to the variety of cement, grade, performance adjustment, play a role.
Post time: Jul-20-2023