Title: X-ray CT characterization and fracture simulation of ASR damage of glass particles in alkaline solution and mortar

Abstract

The alkali-silica reaction (ASR) damage in reactive aggregates affects the long-term durability of the concrete infrastructure. The generated ASR gel can expand by imbibing water from the pore solution and the resulting expansion pressure causes the aggregate fracture. This study aims to simulate the development of ASR damage in glass particles of two types of samples (glass in alkali solution and glass mortars). The dynamic micro X-ray CT technique was conducted to monitor the crack propagation in glass aggregates at different reaction stages (up to 64 hrs). The Boundary Element Method (BEM) and Displacement Discontinuity Method (DDM) were used to efficiently simulate the crack propagation within irregular glass particles under gel expansion pressures. The aggregate boundaries were built with the BEM elements and the initial cracks were meshed with the DDM elements. The estimated expansion pressure was applied to the initial crack surfaces. The discontinuous displacements and stresses were calculated along the crack path and crack tip. The mixed-mode Stress Intensity Factors (SIFs) were calculated based on plane stress conditions. The maximum circumferential stress criteria was used to simulate the propagation of cracks along a specific angle. The simulation results include the simulated crack path and the combined SIFs changingmore » with the increments. With the estimate expansion pressure, the glass particle damages were simulated within conditions of alkali solution and confined motar samples. The predicted crack propagation path was compared with the X-ray CT imaging data. The comparison results demonstrate the DDM has the ability to predicting the ASR damage propagation inside aggregates.« less

Authors:

Guo, Shuaicheng ^[1]; Dai, Qingli ^[1]; Sun, Xiao ^[1]; Xiao, Xianghui ^[2]

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+ Show Author Affiliations

1. Michigan Technological Univ., Houghton, MI (United States). Dept. of Civil and Environmental Engineering
2. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS), X-ray Science Division

Publication Date:

2017-05-20

Research Org.:

Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Org.:

Michigan Department of Environmental Quality; China Scholarship Council; USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:

1475557

Grant/Contract Number:  

AC02-06CH11357

Resource Type:

Accepted Manuscript

Journal Name:

Theoretical and Applied Fracture Mechanics

Additional Journal Information:

Journal Volume: 92; Journal Issue: C; Journal ID: ISSN 0167-8442

Publisher:

Elsevier

Country of Publication:

United States

Language:

English

Subject:

36 MATERIALS SCIENCE; Alkali Silica Reaction; Boundary Element Methods; Crack Propagation; Displacement Discontinuity Methods; X-ray micro computed tomography