Structural Performance of Polymer Fiber Reinforced Engineered Cementitious Composites Subjected to Static and Fatigue Flexural Loading

Abstract

This paper presents the influence of silica sand, local crushed sand and different supplementary cementing materials (SCMs) to Portland cement (C) ratio (SCM/C) on the flexural fatigue performance of engineered cementitious composites (ECCs). ECC is a micromechanically-based designed high-performance polymer fiber reinforced concrete with high ductility which exhibits strain-hardening and micro-cracking behavior in tension and flexure. The relative high cost remains an obstacle for wider commercial use of ECC. The replacement of cement by SCMs, and the use of local sand aggregates can lower cost and enhance greenness of the ECC. The main variables of this study were: type and size of aggregates (local crushed or standard silica sand), type of SCMs (fly ash "FA" or slag), SCM/cement ratio of 1.2 or 2.2, three fatigue stress levels and number of fatigue cycles up to 1 million. The study showed that ECC mixtures produced with crushed sand (with high volume of fly ash and slag) exhibited strain hardening behavior (under static loading) with deformation capacities comparable with those made with silica sand. Class F-fly ash combined with crushed sand was the best choice (compared to class CI fly ash and slag) in order to enhance the ECC ductility with slag-ECC mixtures producing lowest deflection capacity. FA-ECC mixtures with silica sand developed more damage under fatigue loading due to higher deflection evolution than FA-ECC mixtures with crushed sand. OPEN ACCESSPolymers 2015, 7 1300

Avaliação da resistência a fadiga dos Engineered Cementitious Composites (ecc), reforçados com fibra de polipropileno e produzidos com adição de cinza de casca de arroz

“…Na Figura 11 constam dados de ensaios de fadiga em ECC realizados por diferentes pesquisadores [8][9][13][14][15], incluindo os produzidos nesta pesquisa. Os ensaios de fadiga são influenciados por muitos fatores, dos quais se pode destacar a frequência aplicada nos ciclos de carga, os tipos de materiais presentes nos compósitos, os modos de carregamento, a variação entre σ máx e σ mín , entre outros.…”

Fresh and Hardened Properties of Engineered Geopolymer Composite with MgO

“…Researchers at Ryerson University have played significant role in developing ultra-high performance concrete (UHPC), self-consolidating concrete (SSC), lightweight self-consolidating concrete (LWSCC), and engineered cementitious composites (ECC) mixes [32][33][34][35]. A comprehensive study has undertaken recently by the same research group to develop geopolymer based smart engineered cementitious composite (smart EGC: smart Engineered Geopolymer Composite) with self-healing and/or self-sensing properties using dry mix technique.…”

Bond Strength of GFRP Bars Embedded in Engineered Cementitious Composite using RILEM Beam Testing

“…Given the worldwide demand for infrastructure systems, the potential application of ECC either in new construction or as repair/retrofitting material is enormous. Research over the years has contributed to the development of green cost-effective ECC mixtures incorporating locally available sand (instead of relatively expensive and difficult to obtain micro-silica sand), natural pozzolans, industrial wastes and self-healing agents (Sahmaran et al 2009;Ozbay et al 2012;Sherir et al 2015;Hossain and Anwar 2014;Sherir et al 2017) as well as their potential applications in bridge and building structures confirming superior structural and durability performance (Hossain et al 2015a, b;Rafiei et al 2013;Issani and Hossain 2013).…”

“…The GFRP reinforced ECC is a new technology and can improve strength, ductility, durability, resistance to deterioration against aggressive environment, self-healing capability and overall service life of structures compared to their conventional concrete counterparts (Sherir et al 2015(Sherir et al , 2017Hossain et al 2015a, b). Full understanding of the bond characteristics of GFRP bars in ECC is important for this technology to be adopted in structural applications.…”