Key elements of wet mortar quality control: Thickness issue & Pebble problem

Thickness issue

1. The thickness issue refers to the thickness of the mortar.
The thickness of the sand will directly affect the thickness of the mortar. When the mortar is too thick, the construction surface of the workers will be rough and difficult to smooth. When the mortar is too fine, workers will apply it too thinly at one time when plastering the wall, which will affect the construction progress. The surface hardness of the mortar will also decrease after hardening.
2. Before production, you must go to the sand field to judge the thickness of the sand in advance.
The sand fineness modulus is optimally controlled between 2.4 and 2.7. If the sand is too coarse or too fine, the amount of additives must be adjusted accordingly by the technical department.

Pebble problem

1. The stone problem refers to the occurrence of large stones in the mortar. Which seriously affects the performance of the mortar.

2. The appearance of gravel is mainly brought in through six channels:

(mixer, sand field, mixer truck, upper sand bin and belt, intermediate sand hopper, and sand screening machine).
Mixer: If concrete has been produced before, a large amount of stones will remain in the machine. Which needs to be strictly cleaned inside the machine.
Sand yard: If the sand in the sand yard is close to the gravel yard. It may be mixed with gravel. The work awareness of forklift drivers should be especially strengthened to avoid mixing stones when shoveling sand.
Mixer truck: When transporting concrete to load mortar, make sure the inside of the mixer truck is clean.
Listen to the sound of stones when the drum is rotating (trucks transporting concrete often retain a large amount of stones during cleaning. It has no impact on the quality of the concrete but has a particularly large impact on the mortar).
Sand bin and belt: After producing concrete and then producing mortar. The sand bin and belt must be strictly cleaned. Controlling the condition of stones in the mortar is also a very important step.
Middle sand hopper: If the middle sand hopper is adjacent to the gravel hopper. There is a possibility of mixing into each other. Try to keep the two material buckets as close to each other as possible. If it is too close, control must be tightened to avoid mixing. And ensure that there are no holes in the sand bucket wall to avoid mixing.
Sand screening machine: If the screen of the sand screening machine is damaged, large sand particles will appear. And it must be inspected regularly. Avoid sand quality fluctuations caused by mesh breakage. If the screened sand needs to be transferred. A fixed truck should be used for transfer to avoid the situation where the same truck transports both gravel and sand and mixes the gravel.