TY - JOUR
T1 - Sustainable high strength, high ductility engineered cementitious composites (ECC) with substitution of cement by rice husk ash
AU - Zhang, Zhigang
AU - Liu, Siyu
AU - Yang, Fan
AU - Weng, Yiwei
AU - Qian, Shunzhi
N1 - Funding Information:
The authors would like to graciously thank start-up research funding provided by school of Civil and Environmental Engineering, NTU to carry out this research work. Zhigang Zhang would like to thank the Fundamental Research Funds for the Central Universities (Grant No. 2021CDJQY-008 ), National Natural Science Foundation of China (Grant No. 52078083 ), and Natural Science Foundation Project of Chongqing (cstc2020jcyj-msxmX0901), and 111 Project of China (Grant No. B18062 ) for partial support of this work.
Publisher Copyright:
© 2021 Elsevier Ltd
PY - 2021/10/1
Y1 - 2021/10/1
N2 - Generally high strength engineered cementitious composites (ECC) requires high cement content, which is negative to its sustainability as the cement production contributes as much as 8% of global CO2 emissions. To deal with this issue, a sustainable ECC was designed using rice husk ash to partially replace cement up to 40%. Experimental results presented that the compressive strength of the newly designed ECC at 28 days increased from 80 MPa to 111 MPa in spite of diminished cement content. Furthermore, the tensile strain capacity of ECCs increased significantly by forming more micro-cracks as the cement replacement ratios increased. As a side effect, it also reduced the tensile strength of ECCs, which is nevertheless greater than that of conventional C90/105 concrete. At micro-scale, incorporating RHA into ECCs lowered the matrix toughness, yet just reduced the matrix/fiber interfacial bond slightly, as a result, increased PSH index, which well agrees the enhancement of strain capacity of ECCs at composite level. The current results are expected to guide the design of high strength ECC with efficient cement use, and make ECC more sustainable.
AB - Generally high strength engineered cementitious composites (ECC) requires high cement content, which is negative to its sustainability as the cement production contributes as much as 8% of global CO2 emissions. To deal with this issue, a sustainable ECC was designed using rice husk ash to partially replace cement up to 40%. Experimental results presented that the compressive strength of the newly designed ECC at 28 days increased from 80 MPa to 111 MPa in spite of diminished cement content. Furthermore, the tensile strain capacity of ECCs increased significantly by forming more micro-cracks as the cement replacement ratios increased. As a side effect, it also reduced the tensile strength of ECCs, which is nevertheless greater than that of conventional C90/105 concrete. At micro-scale, incorporating RHA into ECCs lowered the matrix toughness, yet just reduced the matrix/fiber interfacial bond slightly, as a result, increased PSH index, which well agrees the enhancement of strain capacity of ECCs at composite level. The current results are expected to guide the design of high strength ECC with efficient cement use, and make ECC more sustainable.
KW - Cement
KW - Engineered cementitious composites
KW - Interface
KW - Mechanical properties
KW - Rice husk ash
UR - http://www.scopus.com/inward/record.url?scp=85111078145&partnerID=8YFLogxK
U2 - doi.org/10.1016/j.jclepro.2021.128379
DO - doi.org/10.1016/j.jclepro.2021.128379
M3 - Journal article
SN - 0959-6526
VL - 317
JO - Journal of Cleaner Production
JF - Journal of Cleaner Production
M1 - 128379
ER -
