Development and characteristics of ultra high-performance lightweight cementitious composites (UHP-LCCs)

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 ...

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Bibliographic Details
Published in:Cement and concrete research 2021-07, Vol.145, p.106462, Article 106462
Main Authors: Lu, Jian-Xin, Shen, Peiliang, Zheng, Haibing, Ali, Hafiz Asad, Poon, Chi Sun
Format: Article
Language:English
Subjects:
Chemical reactions
Compressive strength
Density
High strength
Hollow glass microspheres (HGM)
Lightweight
Lightweight cementitious composite (LCC)
Lightweight UHPC
Mechanical properties
Microspheres
Sound transmission
Structural efficiency
Thermal insulation
Thermal resistance
Ultra high strength
Water resistance
Weight reduction
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Summary: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. •An ultra high-performance lightweight cementitious composite (UHP-LCC) was designed.•The UHP-LCCs had ultra high strength (>120 MPa) and very low density (
ISSN:0008-8846
1873-3948
DOI:10.1016/j.cemconres.2021.106462