Self-leveling mortar with thick layer in unitary system and preparation method thereof

Abstract

The invention discloses self-leveling mortar with a thick layer in a unitary system and a preparation method thereof. High belitesulphoaluminate cement is used as a cementing material, and the shrinkage value is low, the cracking of the mortar is effectively inhibited; an active fine filler is added, the early hydration heat release and the formula cost are reduced, the shrinkage is further reduced and the risk of cracking is reduced. The balance of early strength development and sufficient construction time can be achieved by adding an early strength agent and a retarder. By adding adefoamingagent and an air entrainment agent, the newly-mixed mortar contains some non-connected bubbles with small particle sizes, which gives the newly-mixed mortar suitable construction property, and facilitates improving the strength, impermeability and frost resistance of the hardened body of the mortar. In addition, the mortar has high early strength, the strength reaches 20Mpa after one day, and 40Mpa after 28 days, a single construction thickness is 40 millimeters, the construction process is reduced and the cost is saved, and the thick layer self-levelinghas better fluidity and no sedimentation.

Description

technical field [0001] The invention relates to the field of mortar, in particular to a one-component thick-layer self-leveling mortar and a preparation method thereof. Background technique [0002] In the ground decoration construction, self-leveling mortar is used for leveling. When the flatness of the base is poor, two constructions are usually required, two times of brushing the interface agent and two times of self-leveling mortar, which is time-consuming and laborious and increases the cost. When the mortar is applied twice, it is easy to have honeycomb holes due to leakage of the interface agent, which will affect the subsequent construction. Special attention should be paid to the nodes between the two mortar constructions: one is to construct the second layer of mortar without the surface of the first layer of mortar being dry, because the interface agent seals the interface between the two layers of mortar, the water vapor inside the first layer of mortar cannot I...

AI Technical Summary

Problems solved by technology

[0002] In the ground decoration construction, self-leveling mortar is used for leveling. When the flatness of the base is poor, two constructions are usually required, two times of brushing the interface agent and two times of self-leveling mortar, which is time-consuming, laborious and costly

When the mortar is applied twice, it is easy to have honeycomb holes due to leakage of the interface agent, which will affect the subsequent construction

Special attention should be paid to the nodes between the two mortar constructions: one is to construct the second layer of mortar without the surface of the first layer of mortar being dry, because the interface agent seals the interface between the two layers of mortar, the water vapor inside the first layer of mortar cannot It is discharged through the interface, thereby affecting the strength development and durability of the hardened body; the other is that the first layer of mortar is completely dry before the second layer of mortar is applied, and the water in the second layer of mortar will be partially absorbed by the first layer of mortar, resulting in The cementitious material in the second layer of mortar cannot fully hydrate and harden because there is not enough water

[0003] When the construction thickness of the self-leveling mortar is relatively large (such as more than 5mm), due to the difference in the composition of the mortar material (such as the particle size, particle shape and density of the material), the fluidity of different materials is different in the freshly mixed state, and it is easy to The delamination of materials occurs, which leads to bleeding, settlement or even cracking. From the perspective of material performance development, the uneven distribution of this material will also cause the final self-leveling mortar in different positions (such as surface layer, middle layer and bottom layer). Performance (strength, flexibility, etc.) differences, which greatly affect the final use effect

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