AUTHOR=Zhiqiang Wu , Hengjie Liu , Xiong Qu , Guangai Wu , Xuesong Xing , Xiaowei Cheng , Xiucheng Ni 

TITLE=Improvement of Calcium Aluminate Cement Containing Blast Furnace Slag at 50°C and 315°C

JOURNAL=Frontiers in Materials

VOLUME=Volume 8 - 2021

YEAR=2022

URL=https://www.frontiersin.org/journals/materials/articles/10.3389/fmats.2021.807596

DOI=10.3389/fmats.2021.807596

ISSN=2296-8016

ABSTRACT=Improving cementing quality is important to ensure cement ring integrity during the thermal production of heavy oil thermal recovery wells. Calcium aluminate cement (CAC) was added with three types of blast furnace slags to determine curing performance at 50 °C × 1.01 MPa and 315 °C × 20.7 MPa. CAC slurry performance was evaluated using the cement paste compressive strength and permeability tests to study the physical properties of CAC with blast furnace slag. X-ray diffraction analysis, scanning electron microscopy (SEM), and thermal analysis (DSC/TG) were carried out to investigate the mineralogical composition of CAC with blast furnace slag. Results show that adding blast furnace slag did not affect the performance of cement slurry. Moreover, C2ASH8 curing occurred at low temperature, the microstructure of CAC paste was compact, and the permeability resistance was improved, thus improving the low-temperature properties of neat CAC. When cured at a high temperature, the CAC paste was mainly hydrated with C3ASH4 and AlO(OH), which had a well-developed crystal structure. Adding blast furnace slag can improve the CAC resistance to high temperature.