Effect of hydrothermal curing on early hydration of G-Oil well cement

被引：37

作者：

Palou, Martin ^{[1
,2
]}

Zivica, Vladimir ^{[1
]}

Ifka, Tomas ^{[1
]}

Bohac, Martin ^{[2
]}

Zmrzly, Martin ^{[2
]}

机构：

[1] Slovak Acad Sci, Inst Construct & Architecture, Bratislava 84503 45, Slovakia

[2] Brno Univ Technol, Fac Chem, Brno 61200, Czech Republic

来源：

JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY | 2014年 / 116卷 / 02期

关键词：

Hydrothermal curing; Thermal decomposition; Microstructure; Pore structure; Compressive strength; PORTLAND-CEMENT; TEMPERATURE; SILICA;

D O I：

10.1007/s10973-013-3511-7

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

G-Oil well cement has been cured under standard and hydrothermal conditions with different steam pressures and temperatures. Compressive strength, pore structure parameters, microstructure, and hydrated products were evaluated after 7 days curing by using SEM, MIP, and simultaneous TGA/DSC. Obtained results showed that 7 days aged sample cured under standard conditions has the highest compressive strength with compact pore structure and hydrated products similar to those found after hydration of Ordinary Portland cement. With increasing temperature and pressure from standard conditions (25 A degrees C, 10125 Pa) to hydrothermal ones (150 A degrees C and 0.3 MPa, 200 A degrees C and 1.2 MPa), compressive strength has drastically decreased from 77.5 +/- A 2.0 to 20.5 +/- A 1.0 MPa due to the transformation of original hydrated products (C-S-H) to crystallized alpha-C2SH and C6S2H3. The crystallization has led, under hydrothermal curing, to the increase of permeability and pore structure depletion. The final compressive strength after curing for 7 days at 150 A degrees C (51.8 +/- A 2.0 MPa) and 200 A degrees C (20.5 +/- A 1.0 MPa), which significantly exceeds the recommended values of 3.45 MPa according to API to hold many casings of oil wells is questionable for application in geothermal ones.

引用

页码：597 / 603

页数：7

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