Hygrothermal properties of biochar-modified pervious concrete in hot and humid area

WU Wei; TAN Kanghao; ZHANG Yunhan; WANG Junsong

doi:10.11835/j.issn.2096-6717.2021.171

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Hygrothermal properties of biochar-modified pervious concrete in hot and humid area

Civil Engineering | 更新时间：2023-07-10

- Hygrothermal properties of biochar-modified pervious concrete in hot and humid area
- Journal of Civil and Environmental Engineering Vol. 45, Issue 4, Pages: 173-181(2023)
- 作者机构：
  
  1.广西大学土木建筑工程学院；工程防灾与结构安全教育部重点实验室，南宁 530004
  2.北京工业大学建筑工程学院，北京 100044
  3.华南理工大学亚热带建筑科学国家重点实验室，广州 510640
- 作者简介：
  
  brief: WU Wei (1993- ), main research interests: building materials and energy saving, E-mail: wuweia403@163.com.
  TAN Kanghao （corresponding author）, PhD, E-mail: haokangtan@163.com.
- 基金信息：
  
  National Natural Science Foundation of China(51678243;51678164);The Innovation Project of Guangxi Graduate Education(YCBZ2021022)
- DOI：10.11835/j.issn.2096-6717.2021.171
  CLC： TU528.1
- Received：19 April 2021，
  
  Published：25 August 2023
- 稿件说明：
移动端阅览
WU Wei, TAN Kanghao, ZHANG Yunhan, et al. Hygrothermal properties of biochar-modified pervious concrete in hot and humid area[J]. Journal of Civil and Environmental Engineering, 2023, 45(4): 173-181.
DOI：

WU Wei, TAN Kanghao, ZHANG Yunhan, et al. Hygrothermal properties of biochar-modified pervious concrete in hot and humid area[J]. Journal of Civil and Environmental Engineering, 2023, 45(4): 173-181. DOI： 10.11835/j.issn.2096-6717.2021.171.

摘要

透水混凝土因丰富的孔隙结构而具有良好的渗透和调湿性能，不仅能渗透降雨以减少地表径流，还能在内部截留一定的水分并通过水分蒸发降低表面温度。为提高透水混凝土的保水性以延长其降温效果，利用农业废弃物制成生物炭作为保水填料，并按照一定质量比取代水泥，制备出生物炭透水混凝土，分析生物炭对透水混凝土力学性能的影响，进而在最佳取代率下探讨生物炭对透水混凝土的热物参数和吸水蒸发降温性能的影响。结果表明：当生物炭取代率小于5.0%时，研磨后的超细炭颗粒可以充分发挥填充和内固化效应，有效提高透水混凝土的力学性能；生物炭的掺入对其发射率影响并不显著，但降低了反射率和导热系数；生物炭具有较高的比表面积和丰富的孔隙，添加到透水混凝土后能显著提高其毛细吸水能力和保水能力，而额外吸收的水分能有效降低其表面温度3~6 ℃，维持14~18 h的蒸发冷却效果。

Abstract

Pervious concrete has good permeability and moisture adjustment properties due to its rich pore structure. It can not only penetrate rainfall to reduce surface runoff

but also retain a certain amount of water inside then via evaporation to decrease surface temperature. In order to improve the water retention of pervious concrete and prolong its cooling effect

this study introduced a modified method of incorporating biochar produced by pyrolyzing agricultural wastes into pervious concrete as hygroscopic filler. The effects of biochar on the mechanical properties of pervious concrete were analyzed

then the thermophysical properties

water absorption properties and evaporative cooling performance of biochar-modified pervious concrete with the optimum replacement rate were studied. The results show that the carbonaceous particles after grinding could fully exert the filling and internal curing effects when the replacement rate was less than 5.0%

and effectively improve the mechanical strength of pervious concrete. It was found that the biochar addition had little impact on the emissivity of pervious concrete

while significantly reduced the reflectivity and thermal conductivity. Contributing to the abundant micro-pores and higher specific surface area of biochar particles

it could improve capillary water absorption and water storage ability of pervious concrete. During the evaporation process

the water absorption increment could effectively reduce surface temperature of 3-6 ℃ and maintain evaporation cooling effect for 14-18 h.

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