Effects of High Temperature on the Residual Performance of Portland Cement Concretes

Tolentino, Evandro; Lameiras, Fernando Soares; Gomes, Ana Maria Rabelo; Silva, Claudio A. Rigo da; Vasconcelos, Wander L.

doi:10.1590/s1516-14392002000300014

Cited by 36 publications

(16 citation statements)

References 7 publications

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“…As stated previously the relationship between moisture content and relative humidity is complex and dependent on the characteristics of the pore structure of the concrete in question so naturally will vary from concrete to concrete and also over time and space within the one concrete. Kelvin equation calculations carried out using the pore size distribution reported for other Portland cement concretes ( [54,55]) and the old coupon concrete used in this study suggests that the maximum error in the prediction of M v/v using Eq. (8) is likely to be approximately +/-0.25.…”

Section: Influence Of Sewer Gas H 2 S Concentrationmentioning

confidence: 75%

Modelling concrete deterioration in sewers using theory and field observations

Wells

Melchers

2015

Cement and Concrete Research

101

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Section: Influence Of Sewer Gas H 2 S Concentrationmentioning

confidence: 75%

Modelling concrete deterioration in sewers using theory and field observations

Wells

Melchers

2015

Cement and Concrete Research

101

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“…MTA has low resistance to compression because its composition is similar to that of Type I Portland cement 8,13,14 . Besides, the addition of bismuth oxide (radiopaque agent) to MTA has the effect of increasing its porosity and friability over the long-term 4,29 .…”

Section: Repairmentioning

confidence: 99%

Portland cement with additives in the repair of furcation perforations in dogs

et al. 2012

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PURPOSE:To evaluate the use of Portland cements with additives as furcation perforation repair materials and assess their biocompatibility. METHODS:The four maxillary and mandibular premolars of ten male mongrel dogs (1-1.5 years old, weighing 10-15 kg) received endodontic treatment (n=80 teeth). The furcations were perforated with a round diamond bur (1016 HL). The perforations involved the dentin, cementum, periodontal ligament, and alveolar bone. A calcium sulfate barrier was placed into the perforated bone to prevent extrusion of obturation material into the periradicular space. The obturation materials MTA (control), white, Type II, and Type V Portland cements were randomly allocated to the teeth. Treated teeth were restored with composite resin. After 120 days, the animals were sacrificed and samples containing the teeth were collected and prepared for histological analysis. RESULTS:There were no significant differences in the amount of newly formed bone between teeth treated with the different obturation materials (p=0.879). CONCLUSION:Biomineralization occurred for all obturation materials tested, suggesting that these materials have similar biocompatibility.Key words: Biocompatible Materials. Calcium Sulfate. Dental Cements. Furcation Defects. Dogs. RESUMO OBJETIVO:Avaliar o uso de cimentos Portland aditivados na reparação de perfurações radiculares e a biocompatibilidade destes materiais. MÉTODOS:Oitenta pré-molares, quatro da arcada dentária superior e quatro da arcada inferior de 10 cães machos, sem raça definida, com idade em torno de um a um ano e meio, pesando entre 10 e 15 kg foram submetidos a tratamento endodôntico, sendo realizadas perfurações nas furcas com broca de diamante 1016 HL. A cavidade envolveu dentina e cemento, como também periodonto e o osso alveolar. Na porção óssea da obturação, barreira de sulfato de cálcio foi utilizada evitando extravasamento do cimento para o espaço periodontal. Foi realizada a distribuição randomizada dos cimentos MTA (controle), Portland tipo II, Portland tipo V e Portland branco estrutural nas obturações. Os dentes foram restaurados com resina composta. Após 120 dias realizou-se eutanásia, retirada dos dentes, preparação e análise histológica. RESULTADOS:Entre os cimentos não houve diferença estatística significante quanto à neoformação óssea (p=0,879). CONCLUSÃO:Ocorreu biomineralização com os diferentes cimentos usados no estudo, sugerindo que estes são similares em termos de biocompatibilidade.Descritores: Materiais Biocompatíveis. Sulfato de Cálcio. Cimentos Dentários. Defeitos da Furca. Cães.Silva Neto JD et al.

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“…Locally available ordinary portland cement produced in "Badoosh cement factory" according to the Iraqi standard specification (IQS, No.5, 1984) was used throughout the research work. The chemical and mineralogical analysis of the cement is shown in table (1).…”

Section: Experimental Program 31 Materials Cementmentioning

confidence: 99%

“…In (2002) Tolentino et al [1] analyzed the residual performance of Portland cement concretes heat-treated at (600) C after cooling down to room temperature. Concretes with characteristic compressive strength at (28) days of (45) MPa and of (60) MPa were studied.…”

Section: Introductionmentioning

confidence: 99%

Effect of High Temperature on Mechanical Properties of Concrete Containing Admixtures

Ahmad¹,

Abdulkareem²

2010

(AREJ)

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This research work includes an experimental investigation to study the effect of high temperatures on the mechanical properties of concrete containing admixtures. A comparative study was conducted on concrete mixes, reference mix without an additive and that with an admixture. Concrete was exposed to three levels of high temperatures (200,400,600)°C, for a duration of one hour, without any imposed load during the heating. Five types of admixtures were used, superplasticizer, plasticizer, retarder and water reducing admixture, an accelerator and an air entraining admixture. Mechanical properties of concrete were studied at different high temperatures, including: compressive strength, splitting tensile strength, modulus of elasticity and ultimate strain. Test results showed a reduction in the studied properties by different rates for different additives and for each temperature, the decrease was very limited at temperature up to (200°C) but was clear at (400,600)°C.

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Effects of High Temperature on the Residual Performance of Portland Cement Concretes

Cited by 36 publications

References 7 publications

Modelling concrete deterioration in sewers using theory and field observations

Modelling concrete deterioration in sewers using theory and field observations

Portland cement with additives in the repair of furcation perforations in dogs

Effect of High Temperature on Mechanical Properties of Concrete Containing Admixtures

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