Abstract
Glazed hollow bead insulation concrete (GHBC) presents a promising application prospect in terms of its light weight and superior fire resistance. However, only a few studies have focused on the creep behaviour of GHBC exposed to high temperatures. Therefore, in this study, the mechanism of high temperature on GHBC is analysed through a series of tests on uniaxial compression and multistage creep of GHBC, exposed from room temperature up to 800 °C. The results show a decrease in the weight and compressive strength of GHBC as the temperature rises. After 800 °C, the loss of weight and strength reach to 9.67% and 69.84%, respectively. The creep strain and creep rate increase, with a higher target temperature and higher stress level, while the transient deformation modulus, the creep failure threshold stress, and creep duration are reduced significantly. Furthermore, the creep of GHBC exhibits a considerable increase above 600 °C and the creep under the same loading ratio at 600 °C increases by 74.19% compared to the creep at room temperature. Indeed, the higher the temperature, the more sensitive the stress is to the creep. Based on our findings, the Burgers model agrees well with the creep test data at the primary creep and steady-state creep stages, providing a useful reference for the fire resistance design calculation of the GHBC structures.
Highlights
Owing to its relatively lighter weight, lower thermal conductivity, and better fire resistance compared to other types of concrete, glazed hollow bead insulation concrete (GHBC) has attracted increasing attention in recent years [1]
The main purpose of this study is to investigate the mechanical properties and creep behaviour of Glazed hollow bead insulation concrete (GHBC) after exposure to high temperature, which will be useful in the fire safety designs of GHBC
Is is demonstrated in in Figure displayed as specific withtorespect to that of GHBC
Summary
Owing to its relatively lighter weight, lower thermal conductivity, and better fire resistance compared to other types of concrete, glazed hollow bead insulation concrete (GHBC) has attracted increasing attention in recent years [1]. The glazed hollow bead is (GHB) a kind of inorganic glass mineral material with an irregular sphere made of volcanic rock and turpentine crushed into ore sand and processed using a special puffing procedure [2]. The unique internal cavity and porous structure of GHB are supposed to be key in providing the characteristics of light weight, heat insulation, fire resistance, and aging resistance [4] It is widely used in buildings such as walls, beams, and column members [5], which can significantly reduce the structural weight, foundation load, and basic engineering quantity and achieve remarkable economic benefits [6]. It simplifies the design of building insulation projects, and it reduces self-weight, avoiding the weak combination of the main structure and insulation layer in numerous insulation projects [7,8]
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