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Article
Publication date: 1 April 1957

V. Evans

The first part of this article, published last month, was primarily concerned with a general approach to the problem and dealt with some of the materials used for…

Abstract

The first part of this article, published last month, was primarily concerned with a general approach to the problem and dealt with some of the materials used for corrosion resistant floors, including impervious membranes, PVC and polythene. This month, in concluding the article, the author gives details of several types of floor and their suitability in different industries.

Details

Anti-Corrosion Methods and Materials, vol. 4 no. 4
Type: Research Article
ISSN: 0003-5599

Article
Publication date: 9 April 2018

Syahrir Ridha, Afif Izwan Abd Hamid and Che Ku Afiza Hanim Che Ku Mazuan

The purpose of this paper is to investigate the mechanical properties changing of geopolymer cement under different brine salinity.

Abstract

Purpose

The purpose of this paper is to investigate the mechanical properties changing of geopolymer cement under different brine salinity.

Design/methodology/approach

Geopolymer Cement of Class F Fly Ash and Class G Cement slurries were prepared according to API RP 10B. The optimum alkaline activator/cement and water/cement ratio of 0.44 was used for geopolymer and Class G cement samples, respectively. The alkaline activator was prepared by mixing the proportion of Sodium Hydroxide (NaOH) solutions of 8 M and Sodium Silicate (Na2SiO3) using ratio of 1:2.5 by weight. The slurries were cured for 24 hours at 130oC and 3,000 psi in HPHT Curing Chamber followed by coring process. Both cement sample were immersed in brine water salinity up to 28 days with different brine salinity up to 30 per cent of NaCl. The mechanical properties were investigated using OYO Sonic Viewer-SX and Uniaxial Compressive Strength. The surfaces of the cement samples were extracted for Scanning Electron Microscope (SEM) and EDS tests to evaluate the morphology and chemical compositions of the cured samples.

Findings

The paper shows that geopolymer samples experiences strength reduction in brine water but the reduction rate of geopolymer is about half of the Ordinary Portland cement based oil well cement. The finding was also verified by SEM and EDS result.

Originality/value

This paper investigates the mechanical property changes of emerging geopolymer cement due to different water salinity. The results provide potential application of geopolymer cement for oil well cementing.

Details

International Journal of Structural Integrity, vol. 9 no. 2
Type: Research Article
ISSN: 1757-9864

Keywords

Article
Publication date: 6 September 2013

Chengqiang Ren, Yi He, Dezhi Zeng and Taihe Shi

The long‐term durability of cement becomes an important challenge in oil and gas wells due to the aggressive acid gas. H2S has been found in more and more wells. The…

Abstract

Purpose

The long‐term durability of cement becomes an important challenge in oil and gas wells due to the aggressive acid gas. H2S has been found in more and more wells. The purpose of this research was to add polymer latex to the Class G cement in order to promote the H2S corrosion resistance of oilwell cement.

Design/methodology/approach

The water loss and thickening time of cement slurry and compressive strength and gas permeability of bond cement were investigated to determine the cement formulation. The corrosion resistance of the polymer cement was compared to base Class G cement in solution with 1.8 MPa H2S at 120°C.

Findings

The optimum concentration of polystyrene latex was determined as 5 percent. The permeability change, compressive strength loss and corrosion ratio of latex cement were all lower than for the base Class G cement. The electrochemical impedance spectroscopy results and microstructure details confirmed that the latex cement had stronger resistance to the aggressive medium. Thus, latex cement had excellent corrosion resistance to H2S.

Originality/value

The findings of this study can further improve the sulfide resistance of Class G cement. Two roles of the polystyrene latex were observed in the cement, including interstitial in‐filling of the pore structure and packing around hydration products, which are proposed to properly explain the results.

Details

Anti-Corrosion Methods and Materials, vol. 60 no. 5
Type: Research Article
ISSN: 0003-5599

Keywords

Article
Publication date: 1 February 2002

R. Romagnoli, R.O. Batic, V.F. Vetere, J.D. Sota, I.T. Lucchini and R.O. Carbonari

Hardened cement paste is a heterogeneous system resulting from the grouping of particles, films, microcrystals and other solid structural elements bounded in a porous…

Abstract

Hardened cement paste is a heterogeneous system resulting from the grouping of particles, films, microcrystals and other solid structural elements bounded in a porous mass. The cement paste microstructure must be understood firstly due to its influence on concrete properties. The behaviour of concrete greatly depends on the conformation of localised special structures rather than on general structures found in the mass cement paste. The objective of this paper was to study the cement paste microstructure, as a function of the water–cement ratio, in order to interpret the variations of the steel–mortar bond strength and the developing of the corrosion process in steel–mortar specimens kept in tap water and 3 percent sodium chloride solutions for 1 year. A description of the steel–mortar interface was also provided.

Details

Anti-Corrosion Methods and Materials, vol. 49 no. 1
Type: Research Article
ISSN: 0003-5599

Keywords

Article
Publication date: 16 August 2013

Shingo Asamoto, Yvi Le Guen, Olivier Poupard and Bruno Capra

In the carbon dioxide capture and storage (CCS) project, the integrity of CO2 injection wells plays a vital role in the long‐term safety of CO2 storage. The authors aim to…

Abstract

Purpose

In the carbon dioxide capture and storage (CCS) project, the integrity of CO2 injection wells plays a vital role in the long‐term safety of CO2 storage. The authors aim to practically investigate possible CO2 leakage of a CO2 injection well section during the injection operation and shut‐in by the thermomechanical FEM simulation. The application of numerical simulation to the CO2 injection well deep underground is the first step that will help in the quantitative evaluation of the mechanical risks.

Design/methodology/approach

The injection of CO2 at a temperature different from those of the well and the surrounding geological formation is likely to cause different thermal deformations of constitutive well materials. This could lead to cement cracking and microannuli openings at the interfaces of different materials such as casing/cement and cement/rock. In this paper, the possibility and order of magnitude of cement cracking and microannuli creation in the cross section of the well are assessed from a numerical case study within a classical thermomechanical finite element model framework.

Findings

The possibility of compressive failure and tensile cracking in the cement of the studied wells due to CO2 injection is small unless a large casing eccentricity or an initial defect in the cement is present. Some microannuli openings are generated at interfaces cement/casing and/or cement/rock during the CO2 injection because of different thermal shrinkage of each material. However, the width is not important enough to cause significant CO2 leakage under the studied conditions. The use of “flexible” cement especially developed for oil well applications could mitigate the risk of cement cracking during CO2 injection.

Originality/value

Numerous experimental studies on the chemical deterioration of the cement under severe conditions have been carried out. On the other hand, only a few investigations have focused on the mechanical behavior under thermal/pressure changes related to CO2 injection. In this paper, the quantitative analysis to investigate cement cracking and microannuli formation is achieved to help in the identification of possible mechanical defects to cause CO2 leakage. In addition, the discussion about the risk of the possible casing eccentricity and the application of flexible cement in the oil and gas field to CO2 injection well could be practically useful.

Details

Engineering Computations, vol. 30 no. 6
Type: Research Article
ISSN: 0264-4401

Keywords

Article
Publication date: 1 March 1997

Kamal T. Hindy

Investigates the characterization of cement dust collected by electrostatic precipitators and fabric filters to study its ability to be used as a concrete material. The…

485

Abstract

Investigates the characterization of cement dust collected by electrostatic precipitators and fabric filters to study its ability to be used as a concrete material. The study includes 26 cement dust samples collected from different points on dry process lines in four of the major cement plants in the United Arab Emirates. The collected samples were subjected to detailed physical tests and chemical analyses. Results obtained were compared with the British Standard Specifications set for ordinary Portland cement. Finds that eight samples show comparable physical properties and chemical as well as mineral composition.

Details

Environmental Management and Health, vol. 8 no. 1
Type: Research Article
ISSN: 0956-6163

Keywords

Article
Publication date: 1 October 1960

V. Evans

For the purposes of this article, adhesives, lutes and putties are excluded even though many of them have applications in the corrosion‐resistant field. Included are the…

Abstract

For the purposes of this article, adhesives, lutes and putties are excluded even though many of them have applications in the corrosion‐resistant field. Included are the pouring and mortar‐type cements based on bitumen or sulphur, sodium and potassium silicate solutions, silica sols, rubber or synthetic rubber latices, and synthetic resins. The author considers the composition and working properties of these cements and surveys present trends in their use in industry. Recent and possible future developments are covered.

Details

Anti-Corrosion Methods and Materials, vol. 7 no. 10
Type: Research Article
ISSN: 0003-5599

Article
Publication date: 1 March 1955

T.D. Robson

The corrosion of concrete, and the factors causing or preventing it, present at least as complex a problem as metallic corrosion, and the two are frequently inter‐related…

Abstract

The corrosion of concrete, and the factors causing or preventing it, present at least as complex a problem as metallic corrosion, and the two are frequently inter‐related. A vast tonnage of steel in all kinds of structures is protected by concrete from corrosion In the following article, the author outlines the various types of cement used in concrete, following this with a description of the chemical agents which can corrode concrete, such as organic acids, sulphates, etc. He then examines concrete as a means of preventing corrosion and also as a corrosive agent.

Details

Anti-Corrosion Methods and Materials, vol. 2 no. 3
Type: Research Article
ISSN: 0003-5599

Article
Publication date: 1 October 2018

Syahrir Ridha, Afif Izwan Abd Hamid, Riau Andriana Setiawan and Ahmad Radzi Shahari

The purpose of this paper is to investigate the resistivity of geopolymer cement with nano-silica additive toward acid exposure for oil well cement application.

Abstract

Purpose

The purpose of this paper is to investigate the resistivity of geopolymer cement with nano-silica additive toward acid exposure for oil well cement application.

Design/methodology/approach

An experimental study was conducted to assess the acid resistance of fly ash-based geopolymer cement with nano-silica additive at a concentration of 0 and 1 wt.% to understand its effect on the strength and microstructural development. Geopolymer cement of Class C fly ash and API Class G cement were used. The alkaline activator was prepared by mixing the proportion of sodium hydroxide (NaOH) solutions of 8 M and sodium silicate (Na2SiO3) using ratio of 1:2.5 by weight. After casting, the specimens were subjected to elevated curing condition at 3,500 psi and 130°C for 24 h. Durability of cement samples was assessed by immersing them in 15 wt.% of hydrochloric acid and 15 wt.% sulfuric acid for a period of 14 days. Evaluation of its resistance in terms of compressive strength and microstructural behavior were carried out by using ELE ADR 3000 and SEM, respectively.

Findings

The paper shows that geopolymer cement with 1 wt.% addition of nano-silica were highly resistant to sulfuric and hydrochloric acid. The strength increase was contributed by the densification of the microstructure with the addition of nano-silica.

Originality/value

This paper investigates the mechanical property and microstructure behavior of emerging geopolymer cement due to hydrochloric and sulfuric acids exposure. The results provide potential application of fly ash-based geopolymer cement as oil well cementing.

Details

International Journal of Structural Integrity, vol. 9 no. 5
Type: Research Article
ISSN: 1757-9864

Keywords

Article
Publication date: 19 August 2022

Yuting Lu, Wanwan Fu, hao Ren, Shifang Wu, Jiesheng Liu and Hao Peng

The purpose of this paper is to develop a high-performance composite emulsion cement waterproof coating. The coating has excellent durability and is effective in…

Abstract

Purpose

The purpose of this paper is to develop a high-performance composite emulsion cement waterproof coating. The coating has excellent durability and is effective in protecting cement mortar substrates from harmful ions.

Design/methodology/approach

The polymer cement waterproof coatings with different emulsion compounding ratios were tested for mechanical properties and water resistance after alkali immersion, water immersion, thermal aging and UV aging, and the coatings were analyzed by infrared spectroscopy after aging to evaluate its durability. Meanwhile, the coating that presents favorable durability was applied to cement mortar test blocks. The protective effect of the coating on the test blocks was tested by immersion method, and X-ray diffraction analysis was performed on the eroded test blocks.

Findings

The coating with neoprene latex/acrylate latex weight ratio of 90/10 presents favorable durability and has superior overall performance. Besides, when it is applied to cement mortar blocks, the coatings effectively reduced the erosive effect of harmful ions on cement mortar blocks, resulting in much lower mass change ratios and less internal structural damage of the blocks significantly.

Originality/value

The obtained coating will be of great application potential for use in building waterproofing construction. Moreover, the coating can practically prevent chloride ions and sulfate ions from penetrating cement-based materials.

Details

Pigment & Resin Technology, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 0369-9420

Keywords

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