Title: Study on the Pore Characteristics of Micro Foam Concrete Based on Different Mixing Ratios

Author(s): Changhui Jin, Ningshan Jiang, Hui Li, Chengkui Liu, Aoxiang Cao Jianing Wang , Xiaochu Wen

Publication: Materials Journal

Volume:

Issue:

Appears on pages(s):

Keywords: fractal dimension; porosity; recycled micro powder

DOI: 10.14359/51740703

Date: 3/15/2024

Abstract:
The use of construction waste to prepare recycled micro powder can improve the utilization of construction waste resources and effectively reduce carbon emissions. In this paper, researchers used waste concrete processing micro powder to prepare foam concrete and quantitatively characterized the performance and pore structure of foam concrete by SEM, PCAS, and mechanical property testing methods with different mixing ratios of micro powder, the results showed that: The effect of single mixing of micro powder or fly ash is better than the composite mixing test, and the optimal proportion of compressive strength of single mixing of micro powder is higher than that of single mixing of fly ash. The optimum mixing ratio is 6:4 between cement and micro powder, and the best effect is achieved when the micro powder mixing amount is 40%. Single or double mixing can fill the pores between the foam and strengthen the performance of the substrate. The test of single-mixed or compound-mixed micro powder showed that the fractal dimension decreased with the increase of porosity; the fractal dimension of the specimen increased, the average shape factor became smaller, the compressive strength decreased, and the water absorption rate increased.