XIE Hongyang, DAI Yiwen, REN Yuhang, DENG Yong

(School of Civil Engineering and Architecture, Nanchang Hangkong University, Nanchang 330063, China)

Abstract：In order to explore the effects of foam content (mass fraction, the same below), brick powder content, water-to-material ratio (mass ratio, the same below), hydroxypropyl methylcellulose (HPMC) content, and dry-wet cycle on the properties of brick-doped foam concrete, orthogonal experiments of four factors and five levels were carried out, and the optimal mixing ratio of brick-doped powder foam concrete was determined by combining the power coefficient method. The results show that the optimal mixing ratio of brick-doped powder foam concrete is that foam, brick powder and HPMC content are 3%, 30%, 0.05%, and the water-to-material ratio is 0.55. The compressive strength of foam concrete showes a downward trend with the increase of foam and brick powder content, and a trend of first increasing and then decreasing with the increase of water-to-material ratio and HPMC content. With the increase of the number of dry and wet cycles, the compressive strength of brick-doped powder foam concrete continues to decrease, because the complete pores inside the foam concrete will produce a phenomenon similar to stress concentration around after water absorption and dehydration, resulting in tiny cracks, resulting in the original closed holes becoming harmful holes, and even through cracks, which greatly affects the durability of brick-doped powder foam concrete.

Keywords：foam concrete; brick powder; orthogonal test; water-material ratio; hydroxypropyl methylcellulose; wet and dry cycle; power coefficient method

Get Citation：XIE H Y, DAI Y W, REN Y H, et al. Effects of multiple factors and wetting and drying cycles on properties of brick powder foamed concrete[J]. China Powder Science and Technology, 2023, 29(5): 125-134.

DOI：10.13732/j.issn.1008-5548.2023.05.014

Received：2022-01-11,Revised：2023-07-06,Online：2023-08-28 13：57。

Funding Project：国家自然科学基金项目,编号:52068054;南昌航空大学研究生创新专项资金项目,编号YC2022-130。

First Author：谢洪阳(1973—),男,教授,博士,硕士生导师,研究方向为结构工程。E-mail: xiehongyang486@163.com。

Corresponding Author：戴宜文(1999—),硕士研究生,研究方向为结构工程。E-mail: dyw2458751868@163.com。