The compressive strength of mortar refers to the ability of the mortar sample to withstand the maximum compressive stress under certain conditions. The compressive strength of mortar is one of the essential indicators to measure the quality of mortar, which is directly related to the stability and safety of buildings. This paper will introduce the relevant knowledge and technology of mortar compressive strength from the following aspects.

Definition and classification of mortar compressive strength

Definition of compressive strength of mortar

The compressive strength of mortar refers to the ability of the mortar sample to withstand the maximum compressive stress under the action of force under the specified time and conditions.

Classification of Mortar

According to different use occasions and requirements, mortar can be divided into the following categories:

(1) Cement mortar: It is mainly composed of cement, sand, and water, and is used for bonding and repairing brickwork, lime brick, and concrete walls.

(2) Lime mortar: It is mainly composed of lime, sand, and water, and is used for bonding and repairing brickwork, lime bricks, wood structures, and adobe walls.

(3) Gypsum mortar: It is mainly composed of gypsum, sand, and water, and is used for bonding and repairing interior walls, ceilings, and decorative surfaces.

Factors affecting the compressive strength of mortar

Raw material quality

The strength of mortar is greatly affected by the quality of raw materials. The quality of raw materials directly affects the strength and service life of mortar. Therefore, quality should be paid attention to when purchasing raw materials.

The rationality of the mix ratio

The rationality of the mix ratio also has an important influence on the strength of the mortar. If the mix ratio is unreasonable, the strength of the mortar will decrease. Therefore, attention should be paid to the rationality of the mix ratio when preparing mortar.

Mixing time and mixing intensity

Mixing time and mixing intensity also affect the strength of the mortar. If the mixing time is too short or the mixing strength is not enough, the strength of the mortar will decrease.

Curing time and curing conditions

Curing time and curing conditions also have an important influence on the strength of mortar. During the curing period, proper temperature and humidity should be maintained to avoid premature drying of the mortar and strong direct sunlight, otherwise, the strength of the mortar will be adversely affected.

Technical measures to improve the compressive strength of mortar

Selection of high-quality raw materials

Using high-quality cement, sand, and water can greatly improve the strength and durability of the mortar. When purchasing raw materials, you should pay attention to the quality and brand of raw materials, and try to choose brands with good quality and good reputation.

Control mix ratio

The mix ratio is one of the important factors affecting the strength of mortar. When preparing mortar, the proportion of cement, sand, and water should be well controlled and reasonably matched to avoid too much or too little water and materials to ensure the stability and consistency of mortar strength.

Use the proper mixing method

When mixing mortar, an appropriate mixing method should be adopted to control the mixing time and mixing intensity. Generally speaking, the mixing time should not be less than 3 minutes, and the mixing intensity should be controlled within the specified range to ensure the quality and strength of the mortar.

Strengthen maintenance management

Maintenance is one of the important links to ensure the strength of mortar. During the curing period, care should be taken to maintain a suitable temperature and humidity, and avoid premature drying of the cannon and strong direct sunlight, to ensure the strength and durability of the mortar.

Using new mortar technology

With the continuous development of science and technology, new mortar technology is also emerging. The strength and durability of mortar can be improved by adopting new mortar technology, such as adding an appropriate amount of nitrocellulose, cement modifier, high-efficiency dispersant, etc., which can improve the crack resistance and strength of mortar.

The compressive strength of mortar is one of the important indicators to measure the quality of mortar. Select high-quality raw materials, control the mix ratio, adopt appropriate mixing methods, strengthen maintenance management, and adopt new mortar technology, which can effectively improve mortar’s compressive strength and durability. In actual engineering, appropriate technical measures should be selected according to the specific situation, and various factors should be considered comprehensively to ensure the quality and strength of the mortar.

There are many other excellent articles that you can continue browsing.