Microstructure Variability in addition to Macroscopic Composite Properties of High Per as long as ma

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Microstructure Variability in addition to Macroscopic Composite Properties of High Per as long as ma

Mathew, Viju, Contributing Editor has reference to this Academic Journal, PHwiki organized this Journal Microstructure Variability in addition to Macroscopic Composite Properties of High Per as long as mance Fiber Rein as long as ced Cementitious Composites Victor C. Li in addition to Shuxin Wang Advanced Civil Engineering Materials Research Laboratory The University of Michigan High Per as long as mance Fiber Rein as long as ced Cementitious Composites High strength High durability Self-compacting High tensile failure resistance HPFRCC Characteristics: Strain-Hardening

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Engineered Cementitious Composites Composite response in uniaxial tension Fiber volume fraction 2% 0 1 2 3 4 5 0 1 2 3 4 5 6 Strain (%) Tensile Stress (MPa) 0 20 40 60 80 100 Crack Width (m) Concrete Strain 10 times exp in addition to ed ECC Mihara Bridge in Hokkaido Bridge-deck Link Slab Retrofit Michigan, 2005 Conventional Bridge Joint Durable ECC Link Slab ECC Link Slab

Variation of Tensile Behavior PVA fiber rein as long as ced ECC, Vf = 2% Extreme variability case Microstructure Inhomogeneity Matrix flaws Fiber distribution 10 mm Scale Linking Single fiber pullout behavior Crack initiation at flaw Bridging stress vs. crack opening Multiple-cracking process Composite stress vs. strain Steady State Cracking Requirement Crack Saturation Requirement

Single Fiber Modeling Debonding Pullout Fiber parameters Interface parameters Modeling of Fiber R in addition to omness Conditions as long as Strain-hardening sss sss Variability of Jtip, Jb’ Matrix parameter

Effect of Initial Flaw Size on Cracking Strength (Computed) Matrix intrinsic tensile strength 5 MPa Tailoring of Flaw Size Distribution as long as Saturated Multiple Cracking Superimpose artificial flaws with prescribed sizes Artificial flaws: plastic, bubbles, lightweight aggregates, etc. flaw size c cmc p(c) flaw size c cmc p(c) s s artificial flaw distribution natural flaw distribution Activated flaws activated flaws Flaw Size Tailoring in PVA-ECC 4mm plastic beads

Lightweight Aggregates as Artificial Flaws s/c = 0.8, fa/c = 0.8, w/b = 0.24, PVA Vf = 2.0% lightweight aggr.: 7 vol% w/o lightweight aggr. Plastic Beads as Artificial Flaws s/c = 0.8, fa/c = 1.2, w/b = 0.24, PVA Vf = 2.0% w/ 7 vol% beads w/o beads Open Issues Further underst in addition to linkages between r in addition to omness of microstructures in addition to variability in composite behaviors Capture in addition to quantify r in addition to omness of critical microstructures Incorporate probabilistic models in ECC theoretical framework

Multiple Cracking Process Conclusions Microstructure variability significantly influences ductility of ECC materials Control of key microstructure variability is critical to achieve robust strain-hardening behavior Ensure enough margin between Jtip in addition to Jb’ Implantation of artificial flaws with controlled size Further work in characterization in addition to modeling of microstructure r in addition to omness is needed

Mathew, Viju Spa Magazine Contributing Editor www.phwiki.com

Mathew, Viju Contributing Editor

Mathew, Viju is from United States and they belong to Spa Magazine and they are from  San Francisco, United States got related to this Particular Journal. and Mathew, Viju deal with the subjects like Health and Wellness; Spas and Health Clubs; Travel

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