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Title: Spatially-resolved characterization techniques to investigate impact damage in ultra-high performance concretes
Authors: Military Engineering Basic Research Program (U.S.)
Moser, Robert D.
Allison, Paul G.
Chandler, Mei Qiang, 1968-
Keywords: Characterization
Ultra High Performance Concrete
Publisher: Geotechnical and Structures Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: ERDC/GSL TR ; 13-17.
Description: Technical Report
Abstract: Little work has been done to study the fundamental material behaviors and failure mechanisms of cement-based materials including Ordinary Portland Cement concrete (OPC) and Ultra-High Performance Concretes (UHPCs) under high-strain impact and penetration loads at lower length scales. These high-strain rate loadings have many possible effects on UHPCs at the microscale and nanoscale, including alterations in the hydration state and bonding present in phases such as Calcium Silicate Hydrate (C-S-H), in addition to fracture and debonding. In this work, the possible chemical and physical changes in UHPCs subjected to high strain-rate impact and penetration loads were investigated using a novel technique wherein nanoindentation measurements were spatially correlated with images using Scanning Electron Microscopy (SEM) and chemical composition using Energy Dispersive X-ray microanalysis (EDX). Results indicate that impact degrades both the elastic modulus and indentation hardness of UHPCs, and in particular hydrated phases, with damage likely occurring due to microfracturing and debonding.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Technical Report

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