Engineered Cementitious Composites (ECC) with limestone calcined clay cement (LC3)

Duo Zhang , Beata Eliza Jaworska , He Zhu , Kensey Dahlquist , V.C. Li

Abstract

Recent research have recognized that coupled use of calcined clay, limestone and cement clinker in concrete is viable to reduce environmental footprints at manufacture and to enhance material durability. In this study, a novel application of the limestone calcined clay cement (LC3) is demonstrated by substituting the Ordinary Portland Cement (OPC) in Engineered Cementitious Composites (ECC). The composite mechanical properties including σ-δ and σ-ε relationships and residual crack widths were evaluated to 28 days under uniaxial tension. Matrix chemistry was characterized using thermogravimetric analysis and X-ray diffraction, while the pore structure of matrices and composites was analyzed using mercury intrusion porosimetry. The LC3-based ECC showed more rapid early strength development but lower 28-day strength (~32 MPa) due to a 20% higher water-to-solid ratio for attaining adequate workability and fiber dispersion. Nevertheless, the tensile strain capacity of LC3-based ECC achieved over 6% with an average residual crack width less than 50 μm. Additionally, the composite pore structure exhibited a decreasing volume fraction of large pores and voids (>100 nm) after substituting LC3 for OPC. The use of LC3 marginally decreased the embodied material energy and cost, but led to about 32% and 28% reductions in CO2 emissions compared to traditional OPC-based ECC and concrete, respectively. As a preliminary study, LC3-based ECC shows promise as a greener ductile concrete compared with OPC-based ECC.
Author Duo Zhang
Duo Zhang,,
-
, Beata Eliza Jaworska (FCE / ICE)
Beata Eliza Jaworska,,
- The Institute of Civil Engineering
, He Zhu
He Zhu,,
-
, Kensey Dahlquist
Kensey Dahlquist,,
-
, V.C. Li
V.C. Li,,
-
Journal seriesCement & Concrete Composites, [Cement and Concrete Composites], ISSN 0958-9465, e-ISSN 1873-393X
Issue year2020
Vol114
Pages1-10
Article number103766
Keywords in EnglishEngineered cementitious composites (ECC) ; Limestone calcined clay cement (LC3) ; Tensile ductility ; Crack width Concrete
ASJC Classification2215 Building and Construction; 2500 General Materials Science
DOIDOI:10.1016/j.cemconcomp.2020.103766
URL https://www.sciencedirect.com/science/article/abs/pii/S0958946520302729?via%3Dihub
Languageen angielski
Score (nominal)200
Score sourcejournalList
ScoreMinisterial score = 200.0, 29-08-2020, ArticleFromJournal
Publication indicators Scopus SNIP (Source Normalised Impact per Paper): 2018 = 2.857; WoS Impact Factor: 2018 = 5.172 (2) - 2018=6.486 (5)
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