Relationship Between Engineering Properties, Mineralogy, and Microstructure in Cement‐Based Hydroceramic Materials Cured at 200°–350°C

Kyritsis, Konstantinos; Bentz, Dale P.; Meller, Nicola; Wilson, Moira

doi:10.1111/j.1551-2916.2008.02914.x

Cited by 21 publications

(7 citation statements)

References 23 publications

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“…Finally, it is possible that the difference in composition between the two samples affected the mechanical properties. Recent work suggests that increasing xonotlite content at the expense of tobermorite is likely to result in an increase in compressive strength, which would fit with the differences observed here. Previous research, however, has shown that xonotlite was weaker than tobermorite, making it difficult to draw conclusions about the effect of composition on the strengths observed herein.…”

Section: Discussionsupporting

confidence: 84%

Thermal Stability of the Cement Sheath in Steam Treated Oil Wells

Makar¹,

Lozano²

2011

J. Am. Ceram. Soc.

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The material in this document is covered by the provisions of the Copyright Act, by Canadian laws, policies, regulations and international agreements. Such provisions serve to identify the information source and, in specific instances, to prohibit reproduction of materials without written permission. For more information visit http://laws.justice.gc.ca/en/showtdm/cs/C-42Les renseignements dans ce document sont protégés par la Loi sur le droit d'auteur, par les lois, les politiques et les règlements du Canada et des accords internationaux. Ces dispositions permettent d'identifier la source de l'information et, dans certains cas, d'interdire la copie de documents sans permission écrite. Pour obtenir de plus amples renseignements : http://lois.justice.gc.ca/fr/showtdm/cs/C-42 Considerable work has been done in the past on the phase equilibria and physical properties of thermal cements heated directly to high temperatures. In thermal recovery oil wells the cement sheath is, however, cured for days to years at temperatures of 40°C or less before it is subjected to steam injection temperatures of up to about 320°C. The effects of this alternative curing regime have not been well documented. Here, the impact of pre-curing samples for 1, 14 and 28 days at 35"c before heating to 230°C on phase assemblages, morphologies and physical properties of thermal cement were investigated. Control samples included thermal cements heated directly to high temperature as well as samples cured only at 35 °C. Xonotlite formed the predominant phase in the pre-cured thermal cements instead of the tobermorite found in the control sample heated directly to 23o"c. Although all pre-cured samples were predominantly xonotlite, their morphological characteristics of the phase assemblages were found to vary distinctly with pre-curing time. Significant differences between the pre-cured and directly cured samples were also observed in terms of porosity, permeability and mechanical behaviour.

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Section: Discussionsupporting

confidence: 84%

Thermal Stability of the Cement Sheath in Steam Treated Oil Wells

Makar¹,

Lozano²

2011

J. Am. Ceram. Soc.

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“…Glass components are applied mainly to concrete modification [21][22][23][24][25][26][27][28]. Analyses conducted by the SILICATY Group and others [29][30][31][32] prove that it is possible to limit the amount of lime up to 2% on the condition of good quality sand (rich in Al) or other modifiers are used. Very good results (in particular within the microstructure) are obtained in concrete when an amorphous component (fly ash, glass powder) is added.…”

Section: Introductionmentioning

confidence: 99%

A Sustainable Autoclaved Material Made of Glass Sand

2019

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Far-reaching technological progress, manufacturing, and rapidly advancing globalization dictate new conditions for the development and changes in the construction industry. Valorization of by-products and the use of secondary materials in the production of building materials have attracted a lot of attention. Silicate materials were assessed on the basis of their compressive property. An orthogonal compositional plan type 3k (with k = 2), that is, a full two-factor experiment was applied in order to carry out the compressive strength and bulk density tests. Glass sand was added to the silicate mass as a modification. The results show that the compressive strength was higher than that of traditional bricks. Scanning electron microscopy coupled with energy dispersive spectrometry SEM/EDS was used to study the microstructure, whereas the XRD analysis was applied to examine the structures. Laboratory tests were performed on samples with dimensions of 50 × 50 × 50 mm. The results show the bulk density increase to the value of 1.75 kg/dm3, which increases the acoustic performance of the new products. The results of the modifications also indicate changes in the structure of the new bricks. The reference sample contained α-quartz, zeolite, tobermorite 9A, and calcium aluminum silicate (Ca2Al4Si12O32), whereas the samples modified with glass sand, the presence of phases such as α-cristobalite, natrolite, tobermorite 11A, gyrolite, and analcite was recorded.

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“…Xonotlite, a calcium silicate hydrate, has been industrially produced as a main constituent for heat insulating material [1,2] and building material [3] because of its high stability at high temperature and fibrous crystal form. Xonotlite can be prepared from a silica and calcium hydroxide suspension using a hydrothermal process [4][5][6][7][8][9][10]. The xonotlite crystal formation mechanism from the suspension is complicated and dependent on the reactivity of the raw materials [7][8][9] due to the various intermediate reaction products are formed in the reaction processes.…”

Section: Introductionmentioning

confidence: 99%

Pre-reaction temperature effect on C–S–H colloidal properties and xonotlite formation via steam assisted crystallization

Hsiang

Chen

2015

Mater Struct

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The pre-reaction temperature effects on the crystallization and micro-structure of xonotlite for C-S-H gels with Ca/Si ratio = 1 using a steam assisted crystallization process was investigated. The pre-reaction temperature affected the crystallinity, pore structure and silicate chain structure of C-S-H gels, thereby influencing the xonotlite micro-structure and formation kinetics. A higher Q 2 /Q 1 Si peak intensity ratio were observed in C-S-H gels prereacted at 80°C, indicating that a higher pre-reaction temperature can promote condensation reactions between the Si-OH units, and hence transforming of silicate chain structure from a single chain structure to a double chain structure. The XRD background intensities around 2H = 20°-35°resulting from the occurrence of amorphous C-S-H phase decreased as the pre-reaction temperature increased, suggesting that the pre-reaction temperature can increase the degree of structural order and crystallinity. More xonotlite were formed for C-S-H gels pre-reacted at 40°C and 60°C after reacting at 180°C for 32 h and 190°C for 16 h compared to the sample pre-reacted at 80°C, due to the decrease of the solubility resulting from the increase of the average silicate chain length and the decrease of Ca/Si ratio after pre-reaction at 80°C.

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Relationship Between Engineering Properties, Mineralogy, and Microstructure in Cement‐Based Hydroceramic Materials Cured at 200°–350°C

Cited by 21 publications

References 23 publications

Thermal Stability of the Cement Sheath in Steam Treated Oil Wells

Thermal Stability of the Cement Sheath in Steam Treated Oil Wells

A Sustainable Autoclaved Material Made of Glass Sand

Pre-reaction temperature effect on C–S–H colloidal properties and xonotlite formation via steam assisted crystallization

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