TY - JOUR
T1 - Development and characteristics of ultra high-performance lightweight cementitious composites (UHP-LCCs)
AU - Lu, Jian Xin
AU - Shen, Peiliang
AU - Zheng, Haibing
AU - Ali, Hafiz Asad
AU - Poon, Chi Sun
N1 - Funding Information:
The authors gratefully acknowledge the financial support of The Hong Kong Polytechnic University . The technical assistances of Ms. Dorothy Chan and Ms. Emily Fung (Technicians in the Department of Civil and Environmental Engineering) in carrying out the BET and acoustic properties tests are gratefully acknowledged. Thanks are also due to Dr Zhang Yangyang for his assistance in the Q-XRD analysis. We express our appreciation to the editor and all the anonymous reviewers for their valuable comments for the improvement of this work.
Publisher Copyright:
© 2021 Elsevier Ltd
PY - 2021/7
Y1 - 2021/7
N2 - High strength and light weight are two recent opposite development trends of concrete. This study proposed a design concept of an ultra high-performance lightweight cementitious composite (UHP-LCC), which had a compressive strength of higher than 120 MPa and an air-dried density down to around 1800 kg/m3. The UHP-LCCs were innovatively developed by incorporating micro-sized hollow particles with a high strength shell (hollow glass microspheres, HGM) into an ultra-high performance cementitious composite (UHPC). The roles of HGM in the UHP-LCCs were investigated by evaluating the reactivity of the HGM and the mechanisms on achieving the excellent mechanical properties, low density and superior durability were revealed. The Chapelle test results showed that the HGM exhibited some pozzolanic reactivity, which facilitated the reaction between the shell of HGM and the alkali hydration products of the paste matrix. This chemical reaction was conducive to improving the HGM-paste interface and enhancing the mechanical properties. With the use of microspheres with a high stiff shell, the fundamental properties of the UHP-LCCs including thermal insulation, sound absorption, resistance to water ingress and electrical resistivity were improved significantly. The strategies for preparing the UHP-LCCs with high structural efficiency and great performance were proposed. The results of this study provide a new approach for designing and producing a lightweight UHPC, which would be a promising material for long-span structures.
AB - High strength and light weight are two recent opposite development trends of concrete. This study proposed a design concept of an ultra high-performance lightweight cementitious composite (UHP-LCC), which had a compressive strength of higher than 120 MPa and an air-dried density down to around 1800 kg/m3. The UHP-LCCs were innovatively developed by incorporating micro-sized hollow particles with a high strength shell (hollow glass microspheres, HGM) into an ultra-high performance cementitious composite (UHPC). The roles of HGM in the UHP-LCCs were investigated by evaluating the reactivity of the HGM and the mechanisms on achieving the excellent mechanical properties, low density and superior durability were revealed. The Chapelle test results showed that the HGM exhibited some pozzolanic reactivity, which facilitated the reaction between the shell of HGM and the alkali hydration products of the paste matrix. This chemical reaction was conducive to improving the HGM-paste interface and enhancing the mechanical properties. With the use of microspheres with a high stiff shell, the fundamental properties of the UHP-LCCs including thermal insulation, sound absorption, resistance to water ingress and electrical resistivity were improved significantly. The strategies for preparing the UHP-LCCs with high structural efficiency and great performance were proposed. The results of this study provide a new approach for designing and producing a lightweight UHPC, which would be a promising material for long-span structures.
KW - Hollow glass microspheres (HGM)
KW - Lightweight cementitious composite (LCC)
KW - Lightweight UHPC
KW - Structural efficiency
KW - Ultra high strength
UR - http://www.scopus.com/inward/record.url?scp=85104798365&partnerID=8YFLogxK
U2 - 10.1016/j.cemconres.2021.106462
DO - 10.1016/j.cemconres.2021.106462
M3 - Journal article
AN - SCOPUS:85104798365
SN - 0008-8846
VL - 145
JO - Cement and Concrete Research
JF - Cement and Concrete Research
M1 - 106462
ER -