Mechanical and Durability Characteristics of Latex‐Modified Fiber‐Reinforced Segment Concrete as a Function of Microsilica Content

Abstract

is study evaluated the performance of latex-modified fiber-reinforced concrete (RC) segments as a function of the substitution level of microsilica and type of reinforced fiber, to address the problem of corrosion of steel segments and steel-reinforced fiber segments, which are commonly used to shield tunnel-boring machine (TBM) tunnels in urban spaces. Our study compared macro synthetic, steel, and hybrid (macro synthetic fiber + polypropylene fiber) reinforcing fibers. e substitution levels of microsilica used were 0, 2, 4, and 6%. e target strengths were set at 40 and 60 MPa to test compressive strength, flexural strength, chloride ion penetration resistance, and impact resistance. Testing of latex-modified and fiber-reinforced segment concrete showed that the compressive strength, flexural strength, and chloride ion penetration resistance increased with an increasing substitution level of microsilica. ese improvements were attributed to the densification of the concrete due to filling micropores with microsilica. Micro synthetic fiber was more effective in terms of improved compressive strength, flexural strength, and chloride ion penetration resistance than steel fiber. ese results were due to the higher number of micro synthetic fibers per unit volume compared with steel fiber, which reduced the void volume and suppressed the development of internal cracks. e optimal microsilica content and fiber volume fraction of micro synthetic fiber were 6% and 1%, respectively. To evaluate the effects of the selected mixtures and hybrid fibers simultaneously, other mixing variables were fixed and a hybrid fiber mixture (combination of macro synthetic fibers and polypropylene fibers) was used. e hybrid fiber mixture produced better compressive strength, flexural strength, chloride ion penetration resistance, and impact resistance than the micro synthetic fibers.

Concrete Modular Pavement Structures with Optimized Thickness Based on Characteristics of High Performance Concrete Mixtures with Fibers and Silica Fume

“…The comparison of the findings with those of other studies [ 30 , 31 , 38 ] confirms that both silica fume and fibers significantly increase the load capacity of the PCP slab and, as a result, reduce its thickness. However, this study showed that the effect of reduction depends not only on the concrete mechanical characteristics, base type and joint type but also on the design method.…”

“…Higher content of fibers also significantly influenced the total deformations, which are important for the serviceability limit state. In general, an improvement of concrete characteristics leads to a reduction in the thickness of concrete slabs [ 30 ]. Parker [ 31 ] found that fiber reinforced concrete reduces the thickness of the thin concrete layer by 30% to 50%.…”

Effect of Steel Fiber on the Strength and Flexural Characteristics of Coconut Shell Concrete Partially Blended with Fly Ash

“…Wang and Wang [69] increased the compressive strength of LWC by 23% by using lightweight shale aggregate. Lee and Song [70] found that adding 1% steel fiber to LWC utilizing cellular expanded shale aggregate increased the compressive strength by 37%. In this investigation, steel fiber added to coconut shell concrete enhanced the compressive strength from 15% to 39%.…”

Development of Sustainable Concrete from Hypo Sludge Combined with Basalt Fibre and Latex

“…The inclusion of SBR latex enhances the workability, compressive strength, and flexural strength of pervious concrete, as well as the split tensile strength [18]. The addition of latex to concrete enhanced water permeability resistance due to the creation of a latex layer on the concrete [19] and reduced water absorption in concrete [20]. The incorporation of styrene-butadiene rubber (SBR) latex into light-weight aggregate concrete reduced the water content of the concrete, and it was discovered that latex reduces the penetration of chloride ions [21].…”