Why should thin-layer masonry mortar be developed?

paul

New Member
#1
The thickness of masonry mortar joint is generally 8-12mm, mainly determined by the dimensional accuracy of the block material. The lower the dimensional accuracy of the block material is, the thicker the mortar joints will be required. In general, the strength of mortar joint is lower than that of block material, so the block material between mortar joints will always be in the state of flexural and shear stress. And the flexural strength of the block material is about 20% of the compressive strength, so the failure mode of block material is a small prism after the compression of masonry. If the dimensional accuracy of block material is increased and the dimensional error can be controlled within ± 1mm, then the joint of masonry mortar can be controlled within 3-5mm, and thus thin-layer masonry mortar is possible. The joints of masonry mortar become thinner, and the deformation of mortar along the thickness direction will get decreased, so that the amount of mortar used for mortar can be increased. While the cement amount is increased, the strength and elastic modulus of mortar will also be increased. The increase in the elastic modulus of mortar can significantly improve the stress state of block material, making the block material and mortar increasingly better work together, thereby improving the crack resistance and mechanical properties of masonry. The development of thin-layer masonry mortar can not only improve the brick-laying efficiency and reduce the labor intensity, but also reduce the amount of on-site mortar used, reduce wet operations at the construction site and help protect the environment of construction site. Therefore, it is a direction of developing dry-mixed masonry mortar to improve the quality of mortar and reduce the amount of mortar used.
 
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