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Crack width control and mechanical properties of low carbon engineered cementitious composites (ECC)

Journal Article · · Construction and Building Materials
 [1];  [2];  [2]
  1. Univ. of Michigan, Ann Arbor, MI (United States); OSTI
  2. Univ. of Michigan, Ann Arbor, MI (United States)
Engineered Cementitious Composites (ECC) have superior properties with high tensile ductility and tight crack width compared to conventional concrete. The properties of ECC are significantly influenced by the material composition which can be tailored to enhance the sustainability of ECC. Towards this goal, recycled crumb rubber (CR) and silica fume (SF) were used to tailor the properties of a polypropylene-fiber reinforced ECC with a low carbon binder based on limestone calcined clay cement (LC3) in this study. Crumb rubber was found to be effective in enhancing strain-hardening performance and reducing the width of the multiple microcracks. However, a loss of compressive strength was accompanied by an increasing amount of CR. While silica fume or lower w/b ratio enhanced the compressive strength, the crack width of ECC increased at higher SF content or lower w/b. The underlying mechanisms of these trends were traced to the alteration of the matrix fracture toughness and fiber/matrix interfacial bond. Rubber particle bridging was found to contribute to crack width control. Finally, the combined use of the LC3 green binder and CR led to a lowering of the embodied and operational carbon footprint of ECC.
Research Organization:
Univ. of Michigan, Ann Arbor, MI (United States)
Sponsoring Organization:
USDOE Advanced Research Projects Agency - Energy (ARPA-E)
Grant/Contract Number:
AR0001141
OSTI ID:
1977029
Alternate ID(s):
OSTI ID: 1881548
Journal Information:
Construction and Building Materials, Journal Name: Construction and Building Materials Journal Issue: C Vol. 348; ISSN 0950-0618
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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