Experimental Study on the Mechanical Properties and Durability of High-Content Hybrid Fiber–Polymer Concrete

Abstract

Polymer-modified concrete and fiber concrete are two excellent paving materials that improve the performance of some concrete, but the performance of single application material is still limited. In this paper, polymer-modified concrete with strong deformation and fiber concrete with obvious crack resistance and reinforcement effect were compounded by using the idea of composite material design so as to obtain a high-performance pavement material. The basic mechanical properties of high-content hybrid fiber–polymer-modified concrete, such as workability, compression, flexural resistance, and environmental durability (such as sulfate resistance) were studied by using the test regulations of cement concrete in China. The main results were as follows. (1) The hybrid fiber–polymer concrete displayed reliable working performance, high stiffness, and a modulus of elasticity as high as 35.93 GPa. (2) The hybrid fiber–polymer concrete had a compressive strength of 52.82 MPa, which was 31.2% higher than that of the plain C40 concrete (40.25 MPa); the strength of bending of the hybrid concrete was 11.51 MPa, 191.4% higher than that of the plain concrete (3.95 MPa). (3) The corrosion resistance value of the hybrid fiber–polymer concrete was 81.31%, indicating its adjustability to sulfate attack environments. (4) According to cross-sectional scanning electron microscope (SEM) images, the hybrid fiber–polymer concrete was seemingly more integrated with a dense layer of cementing substance on its surface along with fewer microholes and microcracks as when compared to the ordinary concrete. The research showed that hybrid fiber–polymer concrete had superior strength and environmental erosion resistance and was a pavement material with superior mechanical properties.

Quantitative and Qualitative Aspects of Composite Action of Concrete and Dispersion-Reinforcing Fiber

“…[10] steel, basalt polypropylene 1.5 1.25 [14] steel ultrashort ultrafine steel polypropylene 1.92 4.0 0.27 [17] steel 2 [18] Kevlar + carbon 1.0 [19] nylon + jute 1.0 [20] steel, polypropylene 0.25-0.45 [21] PVA steel 1.0-2.0 1.5-4.0 [30] glass, basalt 0.25-2.0 [31] glass 0.5-3.0 [32] glass, polypropylene 0.5-2.0…”

“…Arbitrary orientation is carried out, as a rule, with short fibers, but in this case, roll materials in the form of canvases, mats, and veils, in which the fibers do not have an organized weave, can also be used. In practice, various types of arbitrary orientation can be implemented in structures [10][11][12][13][14][15]. Plane-arbitrary orientation is characterized by an equiprobable and unlimited (free and chaotic) distribution of fibers in a plane (in two-dimensional space).…”

“…The analysis shows that the effect of constraining the orientation of the fibers is manifested mainly in those cases when the corresponding dimensions of the products exceed the length of the reinforcing fibers by no more than five times. With larger crosssectional dimensions of products, the effect of restraint is noticeably reduced, and the parameters of fiber orientation in a concrete matrix, in this case, approach the parameters of plane-arbitrary or volume-arbitrary reinforcement [1,3,[14][15][16][17].…”

“…The possibility of improving the indicators of durability and operational characteristics of the composite [14][15][16][17][18][19][20][21]. A number of works [18][19][20] considered the mechanical properties of concrete, dispersion-reinforced with various types of fibers.…”

Static test research on steel bridge deck pavement structures paved by high-content hybrid fibre polymer concrete

“…That is, none of the existing studies has reported high fibre admixtures for polymeric concrete, with a typical fibre admixture of no more than 3% by volume 34, 41. To further improve cracking resistance and achieve ultra-high toughness, a series of high-performance polymer concretes with high strength, toughness, and environmental adaptability has been studied and realised 35 – 37 by the authors. As reported in the literature 37 , hybrid fibre polymer concrete exhibits reliable working performance, with the elastic modulus, compressive strength, and flexural strength reaching up to 35.93 GPa, 52.82 MPa, and 11.51 MPa, respectively.…”