固井水泥石孔隙结构演变及力学强度发展规律

doi:10.11896/cldb.20060195

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Abstract Pore structure development law of set cement can provide a crucial reference for cementing process design and cementing quality evaluation. Herein, based on the cement hydration numerical simulation model HYMOSTRUC3D, a novel set cement hydration model was established, the CH content and compressive strength of set cement were obtained to compare the tested results of XRD and the mechanical testing machine respectively, where the deviations between the simulation results and the experimental results were 0.7%—8.7% and 0.5%—10.7%, respectively. The results were in good agreement, which verified the accuracy of the model. Then, based on the established model, the mineral components (C₃S, C₂S, C₃A and C₄AF), hydration products (C-S-H and CH), porosity and pore size distribution, etc. with water-cement ratio as well as hydration age, besides a three-dimensional microstructure of set cement was reconstructed in Para View. In addition, Ryshkewitch function, Schiller function and quadratic linear function were chosen to fit the relationship between compressive strength and the total porosity or the capillary porosity, respectively. The results show that:(1)the porosity gradually decreases, the pore size distribution gradually narrows and the compressive strength gradually increases during the cement hydration process. With the increase of water to cement ratio, the porosity increases, the wide range of pore size distribution increases, and the compressive strength decreases. (2)The compressive strength of set cement is negatively correlated with total porosity or capillary porosity, Ryshkewitch function, Schiller function and quadratic linear function are used to fit the relationship between compressive strength and total porosity or to fit the relationship between compressive strength and capillary porosity, while the fitting determination coefficients are 0.92, 0.85, 0.91 and 0.97, 0.95, 0.97 respectively. (3)Compared with Schiller function and quadratic linear function, Ryshkewitch function is more universal to study the relationship between compressive strength and total porosity or capillary poro-sity. Capillary porosity is the main factor that determines the compressive strength of set cement. (4)y=191.5e^-0.074x can be used to predict and study the relationship between compressive strength and capillary porosity.

Key words： HYMOSTRUC3D model set cement the content of CH compressive strength porosity pore size distribution

Published: 01 July 2021

CLC number:

TE256

Fund:National Key Research and Development Program of China (2016YFE0204300).

About author:: Shaojun Zheng received his B.S. degree in civil engineering from China University of Geosciences (Wuhan) in June 2016. He is currently pursuing his Ph.D. at China University of Geosciences (Wuhan) under the supervision of prof. Guosheng Jiang and associate prof. Tianle Liu. His research has focused on the temporal and spatial evolution of microstructure in the process of water-based mud material hydration under multi field coupling.
Tianle Liu received his Ph. D. degree in drilling and completion engineering from St. Petersburg State University of Mining and Technology in June 2016. He is currently an associate professor in China University of Geosciences (Wuhan), was selected into the “Overseas excellent doctoral talent introduction program” of Hubei Province and “Entrepreneurship and Innovation Talents Program” of Jiangsu Province. His research interests are the research of cement-based material close accumulation, unconventional cementing and special reinforcement technology. He has presided over or participated in more than 10 scientific research projects, published more than 30 articles in important journals at home or abroad, applied for 6 Chinese invention patents and 8 Russian invention patents as the first person.

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	ZHENG Shaojun
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	GAO Peng
	JIANG Guosheng
	FENG Yingtao
	LI Lixia
	CHEN Yu

Cite this article:

ZHENG Shaojun,LIU Tianle,GAO Peng, et al. Pore Structure Evolution and Strength Development of Set Cement[J]. Materials Reports, 2021, 35(12): 12092-12098.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.20060195 OR http://www.mater-rep.com/EN/Y2021/V35/I12/12092

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