Equipment for Concrete Workers

The concrete worker uses formwork and pouring systems, vibrators to remove air bubbles, and power trowels or power floats for finishing. Chemical products include release agents, curing compounds and admixtures such as accelerators, waterproofing admixtures and polypropylene fibres. Aluminium screed rules and mortar spreaders are used to level the mortar. The type of admixture should be chosen according to the result you want and the manufacturer's instructions.

The release agent should be chosen according to the type of formwork and the surface that must remain visible. For timber formwork there are emulsion release agents, while for universal use there are products designed for wood, steel and concrete. For exposed facades, cream release agents are used, designed specifically for exposed surfaces. Apply the release agent before pouring, in a thin, even layer, as stated in the data sheet.

The choice between a single-rotor and a twin-rotor power trowel depends on the surface to be smoothed. For small or irregularly shaped areas the single-rotor is better, while for large surfaces the twin-rotor works faster. Check that the discs and blades are compatible with the machine and that the motor is suited to the thickness of the pour. Work when the concrete has reached the right consistency, as advised by the technician.

The vibrator compacts fresh concrete and removes air bubbles, especially in areas with a lot of reinforcement. It should be inserted vertically into the pour at regular intervals, without touching the formwork or the bars. Do not hold it in one spot for too long, to avoid segregation of the mix. The vibrator produces vibrations: use it with breaks and follow the provisions of D.Lgs. 81/2008 (the Italian Legislative Decree on workplace safety).

An anti-evaporation curing compound forms a film that reduces the evaporation of water from the freshly poured surface. It helps the concrete cure with less risk of shrinkage cracking, especially in hot or windy weather. It is applied by spray or roller immediately after finishing, following the manufacturer's dosage. Do not use it on surfaces that will be painted or bonded without checking compatibility.

Polypropylene fibres are added to the mix to reduce cracking in mortar and concrete pours. Integral waterproofing admixtures and acrylic or vinyl adhesives change the properties of the mix, each for a different result. Choose the admixture according to the application and always follow the dosage and order of addition given by the manufacturer. Admixtures do not replace a correct mix and proper curing.

It is used by concrete workers, bricklayers, building firms and technicians who pour foundations, floors, pavements and concrete structures. It is needed for formwork, pouring, compaction, finishing and curing. For sites of different sizes it is best to plan in advance the volume of the pour, the number of people and the finishing equipment needed.