What Is Lime Mortar?

Lime mortar is a mixture of lime + sand + water. Lime mortar is a mortar made by mixing lime paste and sand according to a certain ratio, and the strength is obtained completely by the gas hardening of lime. Lime mortar is only used in low-strength, dry environments. The cost is relatively low.

Lime mortar 1: 3: 1 is lime, 3 is sand, that is, sand is 3 times the lime, 1: 3 lime mortar is a normative statement, which can be found in "Comprehensive Quota of Construction and Decoration Engineering of Guangdong Province", number It is: 8003041. The ratio of 1: 3 lime mortar is: 1.198m³ (medium sand): 0.202t (lime): 0.5m³ (water).

Workability of freshly mixed mortar

The workability of mortar refers to whether the mortar is easy to lay a uniform, continuous thin layer on the surface of masonry, and it is tightly bonded to the base layer. Including two aspects of fluidity and water retention.

(1) Liquidity

The factors that affect the fluidity of the mortar mainly include the type and amount of cementitious materials, the amount of water used, and the type, particle shape, thickness and gradation of fine aggregates. Related to the variety and dosage.

Generally, when the substrate is a porous water-absorbent material, or when it is applied under dry and hot conditions, the fluidity should be selected.

Mortar is a cement used in the construction of bricks. It consists of a certain proportion of sand and cementitious materials (cement, lime plaster, clay, etc.). It is also called mortar and also used as mortar. Mortars are commonly used in cement mortar, mixed mortar (also called cement lime mortar), lime mortar and clay mortar.

According to the composition materials, ordinary mortar can be divided into: lime mortar. It is made of lime plaster, sand and water according to a certain ratio. It is generally used for masonry and plaster layers that are not high in strength and not subject to humidity; cement mortar. It is made of cement, sand and water according to a certain ratio. It is generally used for masonry, wall or ground in wet environment or water; mixed mortar. It is made by adding appropriate admixtures such as fly ash and diatomaceous earth to cement or lime mortar to save the amount of cement or lime and improve the workability of mortar. Commonly used mixed mortars include cement lime mortar, cement clay mortar and lime clay mortar.

Freshly mixed ordinary mortar should have good workability, and hardened mortar should have the required strength and adhesion. The workability of the mortar is related to its fluidity and water retention, which is generally mastered based on construction experience or determined through experiments. The compressive strength of the mortar is indicated by the mortar number. Commonly used ordinary mortar numbers are 4, 10, 25, 50, 100 and so on. For masonry with high strength requirements and important, only mortars larger than 100 are required. The adhesive force of the mortar increases with the increase of its mark, and it is also related to the surface state of the masonry, whether it is clean or not, the degree of humidity, and the construction and maintenance conditions. Therefore, it is generally necessary to wet the bricks before laying bricks to enhance the adhesion between the bricks and the mortar and ensure the quality of the masonry.

The difference between building mortar and concrete is that it does not contain coarse aggregate. It is made of cementitious material, fine aggregate and water in a certain proportion. According to its use, it is divided into masonry mortar and plastering mortar; according to the different materials, it is divided into cement mortar, lime mortar, gypsum mortar and cement-lime mixed mortar. The rational use of mortar has an important role in saving gelling materials, facilitating construction, and improving project quality.

According to different uses, it is divided into: masonry mortar, plastering mortar (including decorative mortar, waterproof mortar), bonding mortar, etc. ^[1] .