多因素及干湿循环对泡沫混凝土性能的影响

Effects of multiple factors and wetting and drying cycles on properties of brick powder foamed concrete

谢洪阳, 戴宜文, 任宇航, 邓勇

（南昌航空大学土木建筑学院, 江西南昌330063）

引用格式：谢洪阳, 戴宜文, 任宇航, 等. 多因素及干湿循环对泡沫混凝土性能的影响[J]. 中国粉体技术, 2023, 29(5): 125-134.

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

收稿日期：2022-01-11,修回日期：2023-07-06，在线出版时间：2023-08-28 13：57。

基金项目：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。

第一作者简介：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。

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

摘要：为了探索泡沫掺量(质量分数,下同)、砖粉掺量、水料比(质量比, 下同)和羟丙基甲基纤维素(HPMC)掺量、干湿循环对掺砖粉的泡沫混凝土性能的影响, 开展四因素五水平的正交实验, 并结合功效系数法确定掺砖粉泡沫混凝土的最优配合比。结果表明: 泡沫混凝土的最优配合比为泡沫、砖粉、 HPMC掺量分别为3%、 30%、 0.05%、水料比为0.55。泡沫混凝土的抗压强度随泡沫和砖粉掺量的增加呈下降趋势、随水料比和HPMC掺量的增加呈现先上升后下降的趋势;随着干湿循环次数的增加,掺砖粉泡沫混凝土的抗压强度不断减小,原因是泡沫混凝土内部的完整气孔在吸水和脱水之后,周围会产生类似于应力集中的现象,产生微小裂缝,导致原先密闭的孔洞变为有害孔洞,甚至会产生贯穿裂缝,极大地影响掺砖粉泡沫混凝土的耐久性。

关键词：泡沫混凝土; 砖粉; 正交试验; 水料比; 羟丙基甲基纤维素; 干湿循环; 功效系数法

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

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