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  1. Mechanical Properties and Nanostructure of Cement-Based Materials Reinforced with Carbon Nanofibers and Polyvinyl Alcohol (PVA) Microfibers

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    Description: There have been numerous studies that have aimed at improving the low tensile strength, stiffness, and toughness of cementitious materials. This study aims to show that all of these characteristics can be greatly improved by the addition of ladder scale reinforcement at the nano and micro scale. Carbon nanofibers (CNFs)...
    Keyword: hybrid composites, scanning electron microscopy, mechanical properties, carbon nanofibers, nanofiber reinforcement, and polyvinyl alcohol microfibers
    Creator: Zoi S. Metaxa, Maria S. Konsta-Gdoutos, and Surendra P. Shah
    Owner: Chris Diaz
    Date Uploaded: 08/14/2017
    Date Modified: 08/17/2017
    Date Created: 2011
    Rights: All rights reserved
    Resource Type: Article
  2. Crack Measurement: New Approach to Addressing Blasting Complaints

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    Keyword: crack response and vibration-induced cracking
    Creator: Charles H. Dowding
    Owner: Chris Diaz
    Date Uploaded: 08/14/2017
    Date Modified: 08/14/2017
    Date Created: 2001
    Rights: All rights reserved
    Resource Type: Article
  3. Micro-Meter Measurement of Cracks to Compare Blast and Environmental Effects

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    Description: Concern over construction vibration-induced cracking has led to development of a new approach to vibration monitoring called autonomous crack measurement (ACM) and illustrated in Figure 1. This paper describes the concept as well as sensor performance in the first test house fitted an ACM system. Response of three cracks in...
    Keyword: concrete masonry unit
    Creator: Michael Louis and Charles H. Dowding
    Owner: Chris Diaz
    Date Uploaded: 08/14/2017
    Date Modified: 08/14/2017
    Date Created: 2003
    Rights: All rights reserved
    Resource Type: Article
  4. Response of Cracks to Construction Vibrations and Environmental Effects

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    Description: This paper summarizes micro-inch response of cosmetic cracks in a typical slab-ongrade ranch style house to both construction equipment-induced vibration and environmental (weather) effects. This structure was instrumented, and its response studied as part of the development of an Autonomous Crack Measurement (ACM) system. ACM systems are intended to record...
    Keyword: Autonomous Crack Measurement
    Creator: Charles H. Dowding and Mickey L. Snider
    Owner: Chris Diaz
    Publisher: American Society of Civil Engineers
    Date Uploaded: 08/14/2017
    Date Modified: 08/14/2017
    Date Created: 2004
    Rights: All rights reserved
    Resource Type: Part of Book
  5. Effects of Crack Width on Carbonation Penetration: Implications for Crack-Dating

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    Description: Carbonation, a neutralizing reaction in cement paste, can be used to date cracks in cementitious materials. Currently, comparison between two cracks is the only method available to predict a relative age with carbonation. These two crack studies require a crack of known age in a similar material with similar exposure...
    Keyword: civil engineering
    Creator: Laura E. Sullivan-Green
    Owner: Chris Diaz
    Date Uploaded: 08/14/2017
    Date Modified: 08/14/2017
    Date Created: 2005-03
    Rights: All rights reserved
    Resource Type: Masters Thesis
  6. Blast Induced Micrometer Response of Cracks in Concrete Block Structures

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    Description: Blasting and climatological response of cracks are compared for structures constructed of concrete block typical of home construction in Europe. While much has been written comparing micrometer crack response of wood frame structures typical of residential construction in North America, little has been written concerning response of structures more typical...
    Keyword: climatological crack and vibration
    Creator: Charles H. Dowding
    Owner: Chris Diaz
    Date Uploaded: 08/14/2017
    Date Modified: 08/14/2017
    Date Created: 2007
    Rights: All rights reserved
    Resource Type: Research Paper
  7. Internet-Enabled Geotechnical Data Exchange

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    Description: Surveillance of large geotechnical projects requires autonomous collection of data from a wide range of instrument types. An equally large range of data formats are employed by these measurement systems. A data exchange protocol is needed to make field data available for interpretation on a variety of platforms. This paper...
    Keyword: infrastructure
    Creator: David E. Kosnik
    Owner: Chris Diaz
    Date Uploaded: 08/14/2017
    Date Modified: 08/14/2017
    Date Created: 2007
    Rights: All rights reserved
    Resource Type: Research Paper
  8. Response of Uncracked Drywall Joints and Panels to Blast Vibration and Weather

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    Description: Cracking is one of the most common concerns cited by owners of structures adjacent to construction or mining blasting. While a large database of case studies documenting the relative insignificance of ground motion induced by responsible blasting compared to weather effects on cracks in nearby structures has been established, the...
    Keyword: Autonomous Crack Measurement
    Creator: Jeffrey E. Meissner and Charles H. Dowding
    Owner: Chris Diaz
    Date Uploaded: 08/14/2017
    Date Modified: 08/14/2017
    Date Created: 2011
    Rights: All rights reserved
    Resource Type: Research Paper
  9. Influence of Nucleation Seeding on the Compressive Strength of Ordinary Portland Cement and Alkali Activated Blast-­Furnace Slag (Infrastructure Technology Institute Year 2 Final Report)

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    Description: A study is conducted to determine the effects on the early hydration kinetics and compressive strength by seeding of Portland cement and alkali-activated blast furnace slag with a pure form of calcium silicate hydrate (C-S-H). The effects of C-S-H seeding during the early nucleation and growth period of each type...
    Keyword: Cement production
    Creator: Hamlin Jennings , Jeffrey J. Thomas, and Mija Helena Hubler
    Owner: Nurganym Agzamova
    Publisher: Northwestern University Libraries
    Language: English
    Date Uploaded: 07/26/2017
    Date Modified: 08/14/2017
    Date Created: 2009
    Rights: All rights reserved
    Resource Type: Report
  10. Project No. B371, Acoustic Emission and Strain Gage Monitoring of WIDOT Structure B-5-158, Tower Drive Tied Arch - Green Bay, Wisconsin. Technical Report #1

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    Description: The in-depth inspection by WIDOT detected two sites that had visible cracks in the stiffener-to-hanger diaphragm welds, the east side of Hanger 6 in the north tie girder, and the east side of Hanger 4 in the south tie girder. Additionally, many ultrasonic indications were detected by WIDOT in the...
    Keyword: Acoustic emission testing
    Creator: David W. Prine
    Owner: Nurganym Agzamova
    Publisher: Northwestern University Libraries
    Language: English
    Date Uploaded: 07/26/2017
    Date Modified: 08/14/2017
    Date Created: 1993-06-16
    Rights: All rights reserved
    Resource Type: Report