The Effect of Ethylene Diamine Tetra(Methylene Phosphonic Acid) Sodium on the Hydration of Tricalcium Silicate at 80 °C

被引:2
|
作者
Zou, Yiwei [1 ]
Song, Weikai [1 ]
Sun, Chao [1 ]
Yu, Tianshuai [1 ]
Zhu, Sijia [1 ]
Wang, Chunyu [2 ]
Yao, Xiao [2 ]
机构
[1] COSL Oilfield Chem, R&D Inst, Yanjiao 065201, Peoples R China
[2] Nanjing Tech Univ, Coll Mat Sci & Engn, Nanjing 211816, Peoples R China
关键词
tricalcium silicate; retarder; EDTMPS; oil well cementing; hydration; CEMENT; ADSORPTION; RETARDER; KINETICS;
D O I
10.3390/pr12112414
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
In the field of oil well cementing, controlling the hydration process of cement slurries is essential to ensure successful placement and long-term well integrity, especially under challenging high-temperature and high-pressure conditions. Organic phosphonates such as ethylene diamine tetra(methylenephosphonic acid) sodium (EDTMPS) have been identified as effective retarders that can delay the hydration of tricalcium silicate (C3S), the primary phase responsible for early strength development in cement. This research explores the effect of EDTMPS on C3S hydration, using a combination of analytical techniques including isothermal calorimetry, TGA, XRD, and SEM. The results demonstrate that 0.2% EDTMPS extended the induction period of C3S hydration by up to 4.27 h, reduced the heat flow during the acceleration period by 65%, and lowered the cumulative heat of hydration at 1 d by approximately 14%. As a result, EDTMPS significantly delayed the development of C-S-H gel and CH, thereby extending the setting time of the cement slurry and causing a reduction in the early compressive strength of the cement pastes. Therefore, EDTMPS had a slight effect on the compressive strength of cement pastes at 28 d. The results offer important insights into the retarding mechanism of organic phosphonates and their potential applications in enhancing the performance of oil well cement under high temperatures.
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页数:11
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