This paper presents a rhetorical discussion on the subject of fiber-reinforced concrete, FRC. It is intended as an overview of the types of commercially available FRCs and how they work. It discusses commonly applied terminology and models of mechanical behavior that form a basis for understanding material performance without presenting mathematical details. Historical review is intended to help build a background for what is currently understood about FRC rather than as historical reporting. References from both early and contemporary authors are included as a means of tying the subject together along a time line.

Fiber-reinforced concrete: An overview after 30 years of development

FRP-strengthened RC beams. I: review of debonding strength models

Strength properties of nylon- and polypropylene-fiber-reinforced concretes

Steel-fiber reinforced concrete is increasingly being used day by day as a structural material. The complete stress–strain curve of the material in compression is needed for the analysis and design of structures. In this experimental investigation, an attempt has been made to generate the complete stress–strain curve experimentally for steel-fiber reinforced concrete for compressive strength ranging from 30 to 50 MPa. Round crimped fibers with three volume fractions of 0.5%, 0.75% and 1.0% (39, 59, and 78 kg/m3) and for two aspect ratios of 55 and 82 are considered. The effect of fiber addition to concrete on some of the major parameters namely peak stress, strain at peak stress, the toughness of concrete and the nature of the stress–strain curve is studied. A simple analytical model is proposed to generate both the ascending and descending portions of the stress–strain curve. There exists a good correlation between the experimental results and those calculated based on the analytical model. Equations are also proposed to quantify the effect of fiber on compressive strength, strain at peak stress and the toughness of concrete in terms of fiber reinforcing parameter.

Stress-strain curves for steel-fiber reinforced concrete under compression

https://www.quakewrap.com/frp%20papers/Progress-On-Understanding-Debonding-Problems-In-Reinforced-Concrete-And-Steel-Members-Strengthened-Using-FRP-Composites.pdf

Progress on understanding debonding problems in reinforced concrete and steel members strengthened using FRP composites

Measurement of Properties of Fiber Reinforced Concrete

Flexural behavior of reinforced concrete rectangular beams with epoxy bonded carbon fiber reinforced plastic (CFRP) laminate is experimentally investigated. Comprehensive test data are presented on the effect of CFRP laminates, bonded to the soffit of a beam, on the first crack load, cracking behavior, deflections, serviceability loads, ultimate strength and failure modes. The increase in strength and stiffness provided by the bonded laminates is assessed by varying the number of laminates. The results generally indicate that the flexural strength of strengthened beams is significantly increased. Theoretical analysis using a specially developed computer software is presented to predict the ultimate strength and moment deflection behavior of the beams. The comparison of the experimental results with theoretical values is presented, along with an investigation of the failure nodes.

Reinforced concrete rectangular beams strengthened with CFRP laminates

This paper describes the procedure and results of the field tests on high-density polyethylene (HDPE), PVC, and metal large diameter pipes subjected to a highway design truck loading. Numerical simulations using finite element method are performed to determine pipe-soil system response under live load application. Comparisons of field test data with the predicted responses are made for soil pressures around and above the pipes, deformed cross-sectional pipe profiles, and pipe deflections. The field test results indicated that the buried flexible pipes, embedded with highly compacted graded sand with silt, demonstrated good performance without exhibiting any visible joint opening or structural distress. Under shallow burial conditions, the AASHTO specified deflection limit of 5% is found to be adequate for installation of the flexible pipes during the construction phase, and a vertical deflection limit of 2% is suggested for HDPE pipes based on the truck load response and repeated loading effect.

Full-Scale Field Tests on Flexible Pipes under Live Load Application

The superstructure for integral abutment bridges is cast integrally with abutments that are supported by a single row of piles. Thermal expansion or contraction and concrete creep and shrinkage induce bending stresses in the piles. Very limited design and construction guidelines are available and no unified design procedures exist nationwide; hence, there is a lack of enthusiasm to adopt integral abutment bridges for long spans. Current design and construction practices of integral abutment bridges have been reviewed. Important design parameters are identified with an emphasis on temperature, creep, and shrinkage effects of concrete bridge decks, varying soil strata, and the pile-soil interaction. A parametric study is described regarding the effects of a predrilled hole, the type of fill in the predrilled hole, elevation of the water table, soil type, and pile orientation. The results from the parametric study should aid in the selection and design of piles for integral abutment bridges.

State-of-the-art of integral abutment bridges: design and practice

This paper presents the results of a feasibility study to investigate the flexural behavior of structurally damaged full-scale pretensioned concrete slabs retrofitted with bonded carbon fiber reinforced plastic (CFRP) laminates. The effect of CFRP laminates bonded to the soffit of precracked solid and voided slabs is investigated in terms of flexural strength, deflections, cracking behavior and failure modes. The results, generally, indicate that strengthening of significantly cracked slabs by bonding CFRP laminates is structurally efficient and that the retrofitted slabs are restored to stiffness and strength values nearly equal to or greater than those of the original undamaged slabs. The results indicate that the retrofitted slabs maintained adequate structural integrity and composite action at all stages of testing up to failure.

Madasamy Arockiasamy

Papers

Measurement of Properties of Fiber Reinforced Concrete

Reinforced concrete rectangular beams strengthened with CFRP laminates

Full-Scale Field Tests on Flexible Pipes under Live Load Application

State-of-the-art of integral abutment bridges: design and practice

Experimental investigation on structural repair and strengthening of damaged prestressed concrete slabs utilizing externally bonded carbon laminates