Pore Structure Evolution and Strength Development of Set Cement
ZHENG Shaojun1,2, LIU Tianle1,2, GAO Peng3, JIANG Guosheng1,2, FENG Yingtao4, LI Lixia1,2, CHEN Yu4
1 Faculty of Engineering, China University of Geosciences, Wuhan 430074, China 2 Unconventional Cementing and Special Strengthening Laboratory, China University of Geosciences, Wuhan 430074, China 3 School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China 4 Oilfield Chemistry R&D Institute, COSL, Sanhe 065201, China
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.
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2021, Vol. 35 
