Tensile and fiber dispersion performance of ECC (engineered cementitious composites) produced with ground granulated blast furnace slag

Kim, Jin-Keun; Kim, Jeong‐Su; Ha, Gee Joo; Kim, Seong Su

doi:10.1016/j.cemconres.2007.04.006

Cited by 215 publications

(92 citation statements)

References 13 publications

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“…The addition of BFS can improve the durability of concrete, for instance, enhancing sulfate attack resistance and decelerating chloride ion penetration. Besides, the addition of BFS results in a more homogeneous fiber distribution, because BFS particles provide a driving force for fiber dispersion [14]. Therefore, the use of limestone powder and BFS in ECC not only reduces the cost and increases the greenness, but also improves the workability, the mechanical properties and the durability of ECC.…”

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Development of engineered cementitious composites with limestone powder and blast furnace slag

et al. 2009

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Nowadays limestone powder and blast furnace slag (BFS) are widely used in concrete as blended materials in cement. The replacement of Portland cement by limestone powder and BFS can lower the cost and enhance the greenness of concrete, since the production of these two materials needs less energy and causes less CO 2 emission than Portland cement. Moreover, the use of limestone powder and BFS improves the properties of fresh and hardened concrete, such as workability and durability. Engineered cementitious composites (ECC) is a class of ultra ductile fiber reinforced cementitious composites, characterized by high ductility, tight crack width control and relatively low fiber content. The limestone powder and BFS are used to produce ECC in this research. The mix proportion is designed experimentally by adjusting the amount of limestone powder and BFS, accompanied by four-point bending test and uniaxial tensile test. This study results in an ECC mix proportion with the Portland cement content as low as 15% of powder by weight. This mixture, at 28 days, exhibits a high tensile strain capacity of 3.3%, a tight crack width of 57 lm and a moderate compressive strength of 38 MPa. In order to promote a wide use of ECC, it was tried to simplify the mixing of ECC with only two matrix materials, i.e. BFS cement and limestone powder, instead of three matrix materials. By replacing Portland cement and BFS in the aforementioned ECC mixture with BFS cement, the ECC with BFS cement and limestone powder exhibits a tensile strain capacity of 3.1%, a crack width of 76 lm and a compressive strength of 40 MPa after 28 days of curing.

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Development of engineered cementitious composites with limestone powder and blast furnace slag

et al. 2009

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“…The changes in the matrix are primarily associated with the control on the grain size of sand, sand/cement ratio, the type and quantity of mineral admixtures and the use of plasticizers/superplasticizers additives and viscosity modifying agents [12][13] . In this paper the influence of sisal fibre volume fraction (1%, 2%, 3%, 4% and 6%), fibre length (25 mm and 50 mm) and cement matrix workability on the compressive stressstrain behaviour of cement mortar composites is evaluated experimentally.…”

Section: Introductionmentioning

confidence: 99%

Compressive stress-strain behaviour of cement mortar-composites reinforced with short sisal fibre

Lima

Filho

2013

Mat. Res.

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To design building elements using sisal fibre reinforced mortar composites, the stress-strain curves of the composites both under tensile and compression load is needed. In this study short sisal fibre-cement based composites were developed and their stress-strain behaviour under compression characterized experimentally. The composites consisted of two mortar matrices, one self-compacting and one of normal consistency, reinforced with randomly distributed short sisal fibre (25 and 50 mm long) in volume fractions ranging from 2% to 6%. Based on the experimental results a compressive constitutive law for the composites was proposed based on the damage theory developed by Mazars (1986). This theory was used to model the ascending branch of the stress-strain curve and a damage parameter associated to the fibre-reinforcing index is proposed to allow the modelling of the post-peak behaviour of the composites. The modified model was then validated using results available in the literature. The experimental results obtained in the study indicated that the addition of short sisal fibres to cement matrices tends to reduce its elastic modulus, peak stress and strain and to increase its toughness. However, the use of a self-compacting matrix allowed better sisal fiber dispersion and composites with superior performance were obtained. The modified analytical model was able to predict with good accuracy the ascending and descending branch of the stress-strain curves of the sisal fiber-mortar composites and allowed evaluating the effect of fibre reinforcing index on material damage. In the ascending branch, an increase in the damage from 40% to 70% is recorded for fiber volume ranging from 2 to 6%. In the descending branch, on the other hand, the variation of fiber volume allowed a reduction of the damage from 65% to 60%.

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“…This can be attributed to the ash addition, which improves fibre dispersion. According to Kim et al [9], fibre dispersion is improved by the workability of the mixture. This tendency, however, must be verified through fibre dispersion tests, which were not carried out in the present work.…”

Section: Flexural Testmentioning

confidence: 99%

Tensile Behaviour and Durability Issues of Engineered Cementitious Composites with Rice Husk Ash

et al. 2017

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The Engineered Cementitious Composites (ECC) is a special type of High Performance Fibre Reinforced Cementitious Composite (HPFRCC) characterized by a high tensile ductility with a 2% maximum volume of micro fibres. ECC has a tensile strain-hardening performance that leads to multiple cracking behaviour, thus providing the high ductility to the concrete. One of the main applications of ECC is as structural reinforcement in the construction or rehabilitation of rigid and flexible pavements. In order to adapt the ECC to the Brazilian environment, polypropylene fibres have been used instead to PVA fibres. Moreover, rice husk ash (RHA) has also been used as a partial replacement to cement, aiming to produce an environmentally friendly and a more economically viable version of the ECC. This work presents the results obtained for ECC mixtures containing 10%, 20% and 30% (by volume) of non-processed rice husk ash, as a replacement to cement. An experimental study has been carried out to investigate the tensile behavior and durability issues of these ECCs. The results indicate that the use of RHA is technically viable and that the replacement of 30% cement by RHA leads to the most promising performance in terms of high ductility, resistance to crack propagation, decrease in the water absorption and voids content and heat at hydration.

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Tensile and fiber dispersion performance of ECC (engineered cementitious composites) produced with ground granulated blast furnace slag

Cited by 215 publications

References 13 publications

Development of engineered cementitious composites with limestone powder and blast furnace slag

Development of engineered cementitious composites with limestone powder and blast furnace slag

Compressive stress-strain behaviour of cement mortar-composites reinforced with short sisal fibre

Tensile Behaviour and Durability Issues of Engineered Cementitious Composites with Rice Husk Ash

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