Strain energy and process zone based fracture characterization of a novel iron carbonate binding material

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• 作者：Sumanta Das^a ; ^{Sumanta.Das@asu.edu" class="auth_mail" title="E-mail the corresponding author} ; David Stone^b ; ^{dajstone@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; Barzin Mobasher^a ; ^{barzin@asu.edu" class="auth_mail" title="E-mail the corresponding author} ; Narayanan Neithalath^a ; ^{Narayanan.Neithalath@asu.edu" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Iron-based binder ; Fracture process zone ; Strain energy ; R-curve ; Tensile constitutive response
• 刊名：Engineering Fracture Mechanics
• 出版年：2016
• 出版时间：May 2016
• 年：2016
• 卷：156
• 期：Complete
• 页码：1-15
• 全文大小：3476 K

文摘

The fracture behavior of a novel structural binder developed using carbonation of metallic iron powder is investigated using notched beams under three-point bending. The iron-based binder demonstrates significantly higher fracture energies compared to conventional ordinary Portland cement binders in both unreinforced and glass fiber-reinforced states. The influence of metallic iron particle inclusions and the carbonate binder on the strain energy release rates (R) and width of the fracture process zone (FPZ; which is the zone of strain localization at the tip of the crack) are evaluated and compared to that of Portland cement-based binders. Tensile constitutive response of these binders is extracted using a crack-face bridging model. The control and fiber-reinforced iron-based binders demonstrate higher tensile strength and ultimate strain capacity as compared to conventional cementitious binders.