Title:
Study on Pore Characteristics of Microfoam Concrete Based on Different Mixing Ratios
Author(s):
C. Jin, N. Jiang, H. Li, C. Liu, A. Cao, J. Wang, and X. Wen
Publication:
Materials Journal
Volume:
121
Issue:
3
Appears on pages(s):
17-28
Keywords:
fractal dimension; porosity; recycled micro powder
DOI:
10.14359/51740703
Date:
5/1/2024
Abstract:
The use of construction waste to prepare recycled micro powder
can improve the use of construction waste resources and effectively
reduce carbon emissions. In this paper, researchers used
waste concrete processing micro powder to prepare foam concrete
(FC) and quantitatively characterized the performance and pore
structure of FC by scanning electron microscopy (SEM), pore
and fissure image recognition and analysis system (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 tests
of single-mixed or compound-mixed micro powder showed that the
fractal dimension decreased with the increase of porosity; when
the fractal dimension of the specimen increased, the average shape
factor became smaller, the compressive strength decreased, and the
water absorption rate increased.