PASSO A PASSO para AJUSTAR na obra um TRAÇO DE CONCRETO de Fck 20 Mpa.

This video highlights the important concept of adjusting the mix on site, according to the conditions of the materials (moisture content of the sand and gravel). This first mix needs to be adjusted to serve as an example for the others. This is considered the correct procedure for preparing concrete on site. IMPORTANT Considerations... This procedure serves to shape the first mix on site, since you cannot control the moisture content of the sand and gravel. Therefore, adjustments must be made to achieve the required slump for concreting. The concrete mixer was turned off when pouring the cement to PRESERVE THE INTEGRITY of the people.... Sand swelling 25% W/C ratio = 0.55 Fckj = 20 MPa Fcmj = 30 MPa J = 28 days Initial mix (for adjustment) 1 bag of CP4 cement 32 MPa (50 kg) 3.75 cans of medium sand 4.00 cans of gravel 1/2 18 liters of drinking water Final mix (after adjustment) 1 bag of CP4 cement 32 MPa (50 kg) 4.0 cans of medium sand 4.5 cans of gravel 1/2 20 liters of drinking water Slump 12 cm +/- 2 cm Employee; Ademar - Ah concretos Self-taught concrete technology expert with knowledge of concrete mix proportioning, methods, and characteristics. Contact email: [email protected]