Buy article PDF
The purchased file will be sent to you
via email after the payment is completed.
US$ 35
|
Advances in Concrete Construction Volume 15, Number 6, June 2023 , pages 419-430 DOI: https://doi.org/10.12989/acc.2023.15.6.419 |
|
|
 open accessEnhancement of mechanical and durability properties of preplaced lightweight aggregate concrete |
||
Bo Peng, Jiantao Wang, Xianzheng Dong, Feihua Yang, Chuming Sheng and Yunpeng Liu
|
||
| Abstract | ||
| In this study, the effect of two types of aggregates (fly ash aggregate and shale aggregate) on the density, strength, and durability of preplaced lightweight aggregate concrete (PLWAC) was studied. The results showed that the 7 - 28 days strength of concrete prepared with fly ash aggregates (high water absorption rate) significantly increased, which could attribute to the long-term water release of fly ash aggregates by the refined pore structure. In contrast, the strength increase of concrete prepared with shale aggregates (low water absorption rate) is not apparent. Although PLWAC prepared with fly ash aggregates has a lower density and higher strength (56.8 MPa @ 1600 kg/m3), the chloride diffusion coefficient is relatively high, which could attribute to the diffusion paths established by connected porous aggregates and the negative over-curing effect. Compared to the control group, the partial replacement of fly ash aggregates (30%) with asphalt emulsion (20% solid content) coated aggregates can reduce the chloride diffusion coefficient of concrete by 53.6% while increasing the peak load obtained in a threepoint bending test by 107.3%, fracture energy by 30.3% and characteristic length by 103.5%. The improvement in concrete performance could be attributed to the reduction in the water absorption rate of aggregates and increased energy absorption by polymer during crack propagation. | ||
| Key Words | ||
| durability; lightweight aggregate concrete; mechanical properties; polymer | ||
| Address | ||
| "(1) Bo Peng, Jiantao Wang, Xianzheng Dong, Chuming Sheng, Yunpeng Liu: State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, 430070, China; (2) Jiantao Wang: Huarun Cement Research & Development Co.Ltd, Guangzhou, 410460, China; (3) Feihua Yang: Beijing Building Materials Academy of Sciences Research, Beijing, 100041, China." | ||
| References | ||
| ||