Damage Evolution of Polypropylene–Basalt Hybrid Fiber Ceramsite Concrete under Chloride Erosion and Dry–Wet Cycle

Abstract

To investigate the influence of polypropylene–basalt hybrid fibers (PBHFCC) on the durability of ceramsite concrete, this study determined the appearance change, mass loss rate, relative dynamic elastic modulus, compressive strength and splitting tensile strength of ceramsite concrete with four kinds of hybrid fibers volume admixture under chloride erosion and dry–wet cycles. The results reveal that under this effect, the apparent damage of each group of specimens increased with the growth of the erosion time. The quality, compressive strength and splitting tensile strength of the specimens all increased gradually during the erosion age period of the first 72 d and gradually decreased after 72 d. The relative dynamic elastic modulus was similarly mutated in 48 d. When the hybrid fiber content of the specimens is 0.15 vol %, the enhancement effect of ceramsite concrete is better than that of the other three amounts. The relative dynamic elastic modulus value is used as a damage variable to establish the damage equation, and the damage evolution equation of PBHFCC considering the volume of hybrid fiber under chloride erosion and dry–wet cycle is derived. The conclusions can be used as a reference for the durability design and construction of PBHFCC.

Influence of Polymer Fibers on the Structure and Properties of Modified Variatropic Vibrocentrifuged Concrete

“…And the interactions of these phases with each other through the contact zone will determine the future characteristics of the composite. The effectiveness of the combined use of basalt and polypropylene fiber is also confirmed by a number of the following works [10,44,46,86,87]. The effect of polyreinforcement using polymer fiber and the introduction of microsilica additive has a complex effect on the entire structure of the vibrocentrifuged composite at the macro and micro levels.…”

“…Polypropylene and basalt fibers are the most popular and most often used in the technology of normal-density concrete, and the effectiveness of their use has been confirmed by many scientific studies [ 8 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 ]. Basalt fiber is of inorganic origin, obtained by melting basalt rock in smelting furnaces and drawing continuous threads from this melt through special dies, which are subsequently dried and chopped into fibers.…”

“…As an illustration, in reference [ 43 ], the addition of basalt fiber at a concentration of 0.2% and polypropylene at a concentration of 0.1% to a cement hybrid mortar resulted in an 18.53% increase in compressive strength and a 21.73% increase in bending strength. By utilizing “a combination of basalt and polypropylene fibers in the scope of research” [ 44 , 45 , 46 ], it becomes feasible to enhance the resistance of cement composites against diverse forms of aggressive influences and enhance their durability attributes. The effectiveness, expressed in the increase in mechanical characteristics and impact resistance of cement composites dispersedly reinforced with a combination of basalt and polypropylene fibers in rationally selected dosages, is confirmed by a number of the following studies [ 47 , 48 , 49 , 50 , 51 ].…”

Under Sulfate Dry–Wet Cycling: Exploring the Symmetry of the Mechanical Performance Trend and Grey Prediction of Lightweight Aggregate Concrete with Silica Powder Content

“…The relative dynamic modulus of elasticity is a key metric for assessing changes in the elastic characteristics of concrete when subjected to cyclic or dynamic loading. These parameters are crucial in evaluating the durability and structural integrity of concrete [53,54]. The calculation formula is as follows (2).…”