Effect of Particle Size on Hydration Kinetics and Microstructure Development of Recycled Brick Powder-Cement Pastes

doi:10.12141/j.issn.1000-565X.220784

Abstract

Abstract:

With the advancement of urbanization and the transformation of the old city, the production and stock of construction waste in China are ever increasing, with waste clay bricks accounting for 50%~70%. It has been found that recycled brick powder has the potential as a supplementary cementitious material, but it can lead to a significant reduction in the mechanical properties of cement-based materials. In order to explore the effect of particle size on the activity of recycled brick powder and the hydration kinetics of cement, this study prepared recycled brick powder with different particle sizes by high-energy ball milling. The physical and chemical properties and hydration activity of recycled brick powder were characterized. The effect of particle size of recycled brick powder on the hydration process, microstructure and mechanical properties of recycled brick powder-silicate cement system was analyzed. Based on the Krstulovic-Dabic model, the hydration kinetic parameters of the system were obtained to realize the quantitative evaluation of the hydration process. The results show that with the decrease of the particle size of the recycled brick powder, the lattice distortion of the silicon-aluminum mineral becomes larger and the surface binding energy decreases, resulting in an increase in its hydration activity. The early hydration of recycled brick powder mainly plays a physical filling role, which can accelerate the early hydration of recycled brick powder-cement system and improve the hydration degree of crystallization nucleation and crystal growth→phase boundary reaction→diffusion process. With the decrease of particle size of recycled brick powder, the starting time of pozzolanic reaction is advanced and the degree of pozzolanic reaction is higher. Finally, the later strength of cement mixed with 30% fine-grained recycled brick powder exceeds that of pure cement. This paper lays a foundation for the efficient application of recycled brick powder in cement-based materials.

Key words: recycled brick powder, particle size, hydration kinetics, compressive strength, microstructure development

CLC Number:

TU525

YU Qijun, MA Ting, ZHANG Tongsheng, et al.. Effect of Particle Size on Hydration Kinetics and Microstructure Development of Recycled Brick Powder-Cement Pastes[J]. Journal of South China University of Technology(Natural Science Edition), 2023, 51(11): 63-73.

Figures/Tables 16

Fig.1

Fig.2

Table 1

Fig.3

Fig.4

Fig.5

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Fig.8

Table 2

Effect of particle size on hydration kinetic parameters of RBP-Portland cement system （at 25 ℃）"

D₅₀/μm	n	$K 1'$	$K 2'$	$K 3'$	过程	α₁	α₂
参照组	1.692 22	0.068 00	0.018 37	0.003 16	NG→I→D	0.174	0.236
42.3	1.708 89	0.063 59	0.015 92	0.002 87	NG→I→D	0.144	0.234
27.9	1.713 33	0.063 95	0.016 09	0.002 79	NG→I→D	0.148	0.236
11.2	1.726 53	0.064 07	0.016 29	0.002 64	NG→I→D	0.154	0.237
2.9	1.727 07	0.064 51	0.016 40	0.002 53	NG→I→D	0.167	0.238

Table 2

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原材料	化学组成/%
原材料	SiO₂	Al₂O₃	Fe₂O₃	CaO	MgO	K₂O	Na₂O	SO₃	TiO₂	烧失量	其他
硅酸盐水泥	21.60	4.35	2.95	63.81	1.76	0.51	0.16	2.06		1.19
再生砖粉	64.98	20.63	7.47	1.33	0.77	2.87	0.31	0.17	0.97	0.15	0.25

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