International Concrete Abstracts Portal

Reports on the performance of semi-full scale pavement and overlay slabs under static loads. The test results of 60 mm SFRC pavement slabs having 0.5 percent fibers by volume have been presented under different loading and subgrade conditions. The test results of 100 mm PCC (plain cement concrete) pavement slab resting over a well-compacted subgrade have also been presented. The performance of 201 mm ferro-fibro overlay cast over 60mm cracked SFRC pavement has been reported and compared with a 40 mm SFRC overlay slab cast over 60 mm SFRC pavement. The experimental results of semi-full scale overlay and pavement slabs have been validated by infinite element analysis, a numerical technique developed for the analysis of unlimited domain of a layered system consisting of an overlay, pavement and subgrade of known properties. A comparative study has been presented with respect to Ferro-fibro and SFRC overlays.

A simplified analytical procedure is proposed to predict stress-strain diagram of ferrocement composites under tension. A fracture mechanics approach is used to predict the load at first cracking. Results of a limited experimental investigation are also shown and used to evaluate the analytical model. The influence of curing is also demonstrated experimentally.

Presents comprehensive test data on the flexural strength, deflection, and cracking behavior of thin sheets of 6 to 13 mm thickness reinforced with a wide range of reinforcing elements. Two different sizes of sheets were generally tested under four-point loading, and in the case of glass fibers, a further small laboratory scale test specimen was also tested. Five different types of reinforcing elements were used: steel fibers, welded steel mesh without and with steel fibers, two types of woven polypropylene fabrics and glass fibers. The matrix was designed for durability and high workability with low water-binder ratio and a superplasticizer. In addition, 50 to 70 percent of the portland cement was replaced by fly ash. Extensive test data are presented and compared in terms of limit proportionality, modulus of rupture and cracking. It is shown that a wide range of reinforcement elements can be successfully used for thin sheet applications, and that the performance characteristics of thin sheets are very much a function of the type, geometry, and volume fraction of the reinforcement.

Describes the investigation of a new range of cellulose fibers suited to the reinforcement of a portland cement matrix. This investigation indicated that fibers selectively derived from high-density summerwood are better suited for reinforcement than is the unmodified pulp that contains a large measure of fibers derived from springwood as well as summerwood. Another cellulose fiber material, termed expanded fiber because of its finely fibrillated microstructure, was indicated to have potential as a processing aid. Expanded fiber displayed excellent suspending and retention properties and imparted relatively high uncracked strength to finished composites. Overall, substantial performance differences were observed comparing, tests on wet versus dry specimens and the long-term durability was not evaluated. Despite these limitations, flexural stress/strain performance of the cellulose reinforced composites compared quite well to asbestos and glass fiber reinforced composites. The cellulose composites had substantially more ductility than asbestos cement; in this regard, the load-deflection curve was similar to glass reinforced cement.

The fabrication, properties, and application of carbon fiber reinforced cement (CFRC) product made of coal tar pitch-based high-performance carbon fiber are presented. The experiments were conducted by mixing the chopped carbon fiber strands with cement and sand to obtain CFRC. The mixing test results revealed that this type of carbon fiber disperses quickly and uniformly in ordinary mortar. No special type of mixer is required. To optimize the characteristics of CFRC, experimental analysis was conducted on batches made in a mortar mixer regarding the fiber properties and mix proportion. The relationships of these parameters to the mechanical properties were examined. It was revealed that the parameters determining the apparent viscosity F (flow index) of CFRC slurries are fiber diameter í1, filament number n, specific surface area S, and fiber volume fraction Vf. It was also revealed that the parameters determining the strength of the hardened body were fiber tensile strength TS and Vf. The flexural strength of the 20 mm thick CFRC is about 3 to 4 times greater than that of plain mortar. This CFRC is also stronger and more durable than other FRC under the same conditions. High productivity, light weight, and weatherability characterize this new CFRC. These characteristics being appreciated, precast CFRC products have been increasingly used in construction in Japan. Some detailed descriptions of the practical applications are also made.