Dong Yun, Ma Yuanshan, Zhu Jinbiao, Qiu Jianchun
Huaiyin Institute of Technology, Faculty of Architecture and Civil Engineering, Huai'an 223001, China.
College of Water Conservancy and Hydropower Engineering, Hohai University, Xikang Road No. 1, Nanjing 210098, China.
Materials (Basel). 2022 Jul 26;15(15):5176. doi: 10.3390/ma15155176.
In this paper, the effects of dry density, w/c ratio, and municipal solid waste incineration (MSWI) powder on the multi-scale properties and internal pore structure of foamed concrete were studied by using a single-factor controlled experiment. It was found that an increase in the dry density of foamed concrete could effectively reduce the porosity, leading to the improvement of compressive strength and impermeability and to the reduction of water absorption. The compressive strength, water absorption, and impermeability were mainly affected by the porosity when the w/c ratio changed. With the increase in porosity, the water absorption rate increased, and the compressive strength and impermeability decreased. The addition of MSWI powder caused no obvious change in the overall pore size distribution of the foamed concrete, and there was no significant change in the water absorption and impermeability of the structure. However, because the hydration activity of MSWI powder was lower than that of ordinary Portland cement, the compressive strength of foamed concrete decreased with the increase in MSWI powder.
本文采用单因素控制试验研究了干密度、水灰比和城市固体废弃物焚烧（MSWI）粉对泡沫混凝土多尺度性能及内部孔隙结构的影响。研究发现，泡沫混凝土干密度的增加可有效降低孔隙率，从而提高抗压强度和抗渗性，并降低吸水率。当水灰比变化时，抗压强度、吸水率和抗渗性主要受孔隙率影响。随着孔隙率的增加，吸水率增大，抗压强度和抗渗性降低。MSWI粉的加入对泡沫混凝土的整体孔径分布无明显影响，结构的吸水率和抗渗性也无显著变化。然而，由于MSWI粉的水化活性低于普通硅酸盐水泥，泡沫混凝土的抗压强度随MSWI粉用量的增加而降低。
