Matches in UGent Biblio for { ?s ?p Engineerd Cementitious Composites (ECC) is a class of ultra ductile fiber reinforced cementitious composites, characterized by a high ductility and a tight crack width control. In the production of ECC, beside mix design, processing is another crucial factor for both fresh and hardened properties of ECC. The processing influences the fresh properties of ECC, and the fresh properties of ECC mortar have a significant effect on the hardened properties. Therefore, in order to obtain good hardened properties, fresh properties have to be properly controlled, for example, by means of water or chemical admixture adjustments. This paper explores a complementary approach, focusing on ECC processing sequence aimed at producing ECC of both good fresh and hardened properties. For the new processing sequence, a part of liquid materials, normally water and superplasticizer, are first mixed with matrix materials and fibers are then added. After fibers disperse in mortar homogenously, the rest of the liquid materials are added to modify the workability of fresh ECC and the material properties of hardened ECC. In this paper, the influence of different mixing sequences of water was investigated by comparing the experimental results of uniaxial tensile tests. The new mixing sequence was found to increase the tensile strain capacity and the ultimate tensile strength of ECC. This increase is more prominent in the mixtures with a higher water/powder ratio.. }
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- aggregation abstract "Engineerd Cementitious Composites (ECC) is a class of ultra ductile fiber reinforced cementitious composites, characterized by a high ductility and a tight crack width control. In the production of ECC, beside mix design, processing is another crucial factor for both fresh and hardened properties of ECC. The processing influences the fresh properties of ECC, and the fresh properties of ECC mortar have a significant effect on the hardened properties. Therefore, in order to obtain good hardened properties, fresh properties have to be properly controlled, for example, by means of water or chemical admixture adjustments. This paper explores a complementary approach, focusing on ECC processing sequence aimed at producing ECC of both good fresh and hardened properties. For the new processing sequence, a part of liquid materials, normally water and superplasticizer, are first mixed with matrix materials and fibers are then added. After fibers disperse in mortar homogenously, the rest of the liquid materials are added to modify the workability of fresh ECC and the material properties of hardened ECC. In this paper, the influence of different mixing sequences of water was investigated by comparing the experimental results of uniaxial tensile tests. The new mixing sequence was found to increase the tensile strain capacity and the ultimate tensile strength of ECC. This increase is more prominent in the mixtures with a higher water/powder ratio.".