THE INFLUENCE OF THE AMOUNT OF FIBER AND SUPERPLASTICIZER ON THE STRENGTH OF CONCRETE FOR THE RIGID PAVEMENTS
DOI:
https://doi.org/10.31650/2786-6696-2022-2-60-69Keywords:
rigid pavement, modified fiber concrete, polypropylene fiber, superplasticizer, strength.Abstract
According to the optimal plan, an experiment was conducted in which the following factors of the concrete composition of rigid pavements were varied: the amount of Portland cement (from 350 to 450 kg/m3), the amount of polypropylene fiber with a fiber length of 39 mm and an equivalent diameter of 0.45 mm (from 0 to 3 kg/m3), the amount of superplasticizer based on polycarboxylates (from 1 to 2%). All concrete mixtures had equal mobility S1. Equal mobility was achieved by selecting the amount of water in the composition with appropriate adjustment of the concrete composition. It was established that with an increase in the amount of Portland cement in the concrete composition, the W/C of mixtures of equal mobility decrease. By increasing the amount of superplasticizer from 1 to 2% of the weight of cement, the W/C of the mixture decreases by 10-12%. When polypropylene fiber is introduced in the amount of up to 1.5 kg/m3, the W/C of the mixture practically does not change. But when the amount of fiber is increased to 2.5-3 kg/m3, the W/C of the mixture significantly increases.
The strength of concrete and fiber concrete was determined at the age of 3 and 28 days. It was established that at the age of 3 days, the compressive strength of the tested concretes is 63-69% of its strength at the design age. By increasing the amount of superplasticizer to 2%, the compressive strength increases by 4.5-6 MPa at the age of 3 days, and increases by 7-9 MPa at the age of 28 days. In the early and design age, when the amount of polypropylene fiber increases to 1.5-1.8 kg/m3, the compressive strength of concrete increases by an average of 3 MPa. A further increase in the amount of fiber already has a negative effect on the strength of concrete. At an early age, the influence of the amount of cement on the flexural strength of concrete is more noticeable than at the design age. Due to the increase in the amount of Portland cement from 350 to 450 kg/m3 at the age of 3 days, the flexural strength increases by an average of 1.4 MPa, and at the age of 28 days it increases by 0.5 MPa. Concretes with amount of superplasticizer 1.7-1.8% have the highest flexural strength. Thanks to the application of dispersed reinforcement, the tensile strength of the tested concretes increases by 0.3-0.5 MPa. When using a rational amount of additives and fiber, the flexural strength of the tested concretes is at least 6 MPa, which corresponds to the class Bbtb4.8. According to the requirements of DBN B.2.3-4:2015, such concrete can be used for rigid pavements of any category.
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