Classification and application rules of masonry mortar?

Mortar is a kind of binding substance used in building bricklaying, which is made of a certain proportion of sand and cementing materials (cement, lime putty, clay, etc.). ), also known as mortar and mortar. Mortar is made by mixing with fine aggregate (sand) and cementing materials (cement, lime, clay, etc.). ) In the water. Commonly used are cement mortar, mixed mortar (or cement lime mortar), lime mortar and clay mortar.

According to the composition materials, ordinary mortar can also be divided into:

Lime mortar: It is made of lime paste, sand and water in a certain proportion, and is generally used for masonry and plastering layers with low strength requirements and no moisture.

Cement mortar: it is made of cement, sand and water in a certain proportion, and is generally used for masonry, wall or ground in humid environment or water.

Mixed mortar: It is made by adding appropriate additives such as fly ash and diatomite into cement or lime mortar to save the amount of cement or lime and improve the workability of mortar. Commonly used mixed mortar includes cement lime mortar, cement clay mortar and lime clay mortar.

According to different purposes, it is divided into masonry mortar, plastering mortar (including decorative mortar and waterproof mortar) and so on.

M7.5 cement mortar mixture ratio

Masonry mortar:

Mortar for bricks, stones and other blocks.

Product advantages:

A. It has excellent machinability and adhesion.

B it has excellent water retention, which makes the mortar gel denser under better conditions, and can ensure the effective bonding of mortar on the base surface of dry block.

C it has the characteristics of plastic shrinkage and low dry shrinkage, which ensures the dimensional stability of the wall to the maximum extent.

D, after gelation, it has mechanical properties of rigidity and toughness.

The strength of masonry mortar is expressed by strength grade. Masonry mortar according to compressive strength is divided into? M20, M 15, M 10, m7.5, M5, M25 and so on.

In general, the masonry mortar of M25-M15 is used for the walls of multi-storey buildings; M5 mortar is often used in masonry projects such as masonry foundation, inspection well and rainwater well. M25-m10 masonry mortar is selected for the masonry of industrial workshops, substations and basements. Mortar below M2.5 is commonly used in buildings below the second floor; Simple bungalows and temporary buildings can choose lime mortar; Generally speaking, masonry mortar with strength grade of m7.5 is used in the construction of expressway drainage ditch.

For details of the latest m7.5 cement mortar mix table, please click the blue font to jump.

Plastering mortar:

Mortar coated on the surface of buildings or building components.

Product advantages:

A. able to withstand a series of external influences

B it has enough water washing resistance and can be used for plastering in bathrooms and other damp rooms.

C. reduce the number of plastering layers and improve work efficiency.

D. Good workability makes the base surface of construction smooth and flat.

E it has good sag resistance, low viscosity to plastering tools and easy construction.

F. Mortar has good water retention performance and will not produce cracks after hardening.

G. it has good water vapor permeability.

H. better crack resistance and impermeability.

Thermal insulation mortar:

Additives such as cellulose, rubber powder and fiber are added to polystyrene particle thermal insulation mortar.

Product advantages:

A. it can be used with water and is convenient for construction.

B, high bonding strength, not easy to empty off.

C. Stable physical and mechanical properties, low shrinkage, and prevention of shrinkage cracking or cracking.

D, can be in the wet base construction.

E. the hardened block is dry, and the construction period is short.

F. environmental protection, excellent heat insulation effect.

G. low density, reducing the weight of the building and facilitating the structural design.

Matching mortar for thermal insulation wallboard:

Adhesive and protective mortar for thermal insulation wallboard

Product advantages:

A it has good adhesion to the substrate and polystyrene board.

B it has sufficient denaturation ability (flexibility) and good impact resistance.

C. a variety of decorative materials can be selected for the surface.

D it has light weight and low requirements for walls, and can be directly used on concrete and brick walls.

E. environmental protection and non-toxic, saving a lot of energy.

F. With its excellent adhesion and surface strength, Bo Tu has sufficient protection ability to resist impact and vibration with reinforced grille.

G. Low shrinkage, no cracking, no shelling, long-term weatherability and stability.

It can be used after adding water, which avoids the randomness of on-site mixing mortar and ensures the stable quality.

1. Good water retention and uniformity, and good construction performance.

J. Alkali resistance, water resistance and freeze-thaw resistance

K. quick drying, early strength and high construction efficiency.

Interface mortar:

Interface treatment agent for firmly bonding substrate and surface material

Product advantages:

A. Close the gap of the base material, reduce the absorbability of the base material, and ensure the gelation of the surface mortar.

B, improve the surface strength of the base material and ensure the cohesive force of the mortar.

C, play the role of bonding and bridging between the substrate and the surface layer, so that the substrate and the surface layer are combined into a solid whole.

D, with long-term bonding strength, no aging and no hydration.

E, avoid the secondary watering process before plastering, so as to avoid wall shrinkage.

Decorative mortar:

It can be used for architectural decoration instead of paint and tiles, and can be used as the final decoration without smooth base and other decorative treatment.

Product advantages:

A. natural color texture and soft vision.

B. low cost and high cost performance.

C easy construction, good smearability, quick and convenient construction and various methods.

D. Safety and environmental protection

E. it has good adhesion to the substrate.

F. Good impermeability, low water absorption, high hydrophobicity and pollution resistance.

G. it has good air permeability.

H. the colors are diverse, and the interior and exterior decoration is more interesting and perfect.

I. Water resistance, weather resistance, wear resistance and air permeability

J it is flexible to prevent the coating from cracking.

K. rich expressive force and strong three-dimensional sense

Floor mortar:

Floor mortar, also known as bottom self-leveling, is ground mortar directly bonded with ground structure.

Product advantages:

A. add water, stir and pump, which is simple and easy to use.

B. High compression resistance and compression resistance

C. Low shrinkage rate

D. Excellent adhesion (including interfacial agent)

E. dry companion products with stable quality.

F. Large-scale construction, rapid construction and labor saving.

G automatically level the ground to make the surface smooth and level, and reduce the load of the building.

H. Rapid solidification (rapid solidification system)

Specification for mortar strength inspection:?

Mortar shall be tested for strength. When the strength of masonry mortar test block is accepted, its strength qualification standard must meet the following requirements:?

The average compressive strength of mortar test blocks in the same acceptance batch must be greater than or equal to the cube compressive strength corresponding to the design strength grade.

The average compressive strength of the smallest group of mortar test blocks in the same acceptance batch must be greater than or equal to 0.75 times of the cube compressive strength corresponding to the design strength grade.

Mortar strength should be based on the compressive test results of test blocks with standard curing age of 28d.

Each mixer shall check at least once each batch of masonry mortar of various types and strength grades in masonry with the size not exceeding 250m3.

Inspection method:

Randomly take samples from the outlet of mortar mixer to make mortar test blocks (only one set of test blocks is made for the same mortar), and finally check the strength test report of the test blocks.

Mortar preparation requirements:

(1) The water used for mixing mortar shall conform to the current national standard "Water Standard for Concrete Mixing" (JGJ63). ?

(2) The variety and label of cement used in masonry mortar should be selected according to the masonry location and environment. Before cement is put into use, its strength and stability should be reinspected in batches. The inspection lot shall be a batch with the same manufacturer and number.

(3) The silt content of sand for mortar shall meet the following requirements:

For cement mortar and cement mixed mortar with strength grade not less than M5, it should not exceed 5%; Cement with strength grade lower than M5; Mixed mortar should not exceed10%; Artificial sand, mountain sand and ultra-fine sand should meet the technical requirements of masonry mortar after trial matching. ?

(4) When massive quicklime is digested into lime paste, the digestion time shall not be less than 7d. ?

(5) When mixing mortar on site, the mixture ratio shall be determined by calculation and test in advance, and the materials of each component shall be measured by quality. ?

(6) Masonry mortar shall be mechanically stirred from the end of feeding.

The mixing time shall meet the following requirements:

Cement mortar and cement mixed mortar shall not be less than 2min.

Cement fly ash mortar and mortar mixed with additives shall not be less than 3min.

Mortar mixed with organic plasticizer should be kept for 3 ~ 5min.

Mortar use requirements:

After the mortar is mixed, it should be put into the ash storage device. If the mortar oozes color, it should be mixed again before laying.

Mortar should be used with mixing, and cement mortar and cement mixed mortar must be used within 3h and 4h after mixing.

If the maximum temperature exceeds 30℃ during construction, it must be used within 2h and 3h after mixing.