XIE Hongyang, DAI Yiwen, DONG Jianjun, DENG Yong

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

Abstract：In order to explore the influence of foam content (mass fraction), brick powder content, water-material ratio, HPMC (hydroxy propyl methyl cellulose) content, and freeze-thaw cycle on the performance of brick powder mixed foam concrete, orthogonal experiments with 4 factors and 5 levels were carried out. Combined with the efficiency coefficient method, the optimal mixing ratio of brick powder foamed concrete was determined. The foam content was 3%, brick powder content was 30%, water-material ratio was 0.55 and HPMC content was 0.05%. The results show that compressive strength of foam concrete mixing brick powder with the increase of bubble content is on the decline, with brick powder, water ratio and the increase of HPMC presents the downward trend after rising first, and with the increase of freeze-thaw cycles, mixed powder foam concrete brick strength decreases continuously, the reason is that the bubble inside the concrete after complete stomatal fully absorbing water freezes. As a result, the pore wall is squeezed to produce rupture cracks, which lead to the previously closed holes becoming harmful holes. With the increase of the number of freeze-thaw cycles, a large number of small cracks will even expand and pool into penetrating cracks, which seriously reduce the strength of foamed concrete and greatly affect the durability of foamed concrete mixed with brick and powder.

Keywords：foam concrete; brick powder; orthogonal test; water-material ratio; freeze-thaw cycle; power coefficient method

Get Citation：XIE H Y, DAI Y W, DONG J J, et al. Influence of different factors on the properties of foamed concrete[J]. China Powder Science and Technology, 2023, 29(4): 120-129.

DOI：10.13732/j.issn.1008-5548.2023.04.012

Received：2022-10-09,Revised：2022-12-14,Online：2023-06-13 10:56。

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。