J Camilleri1. 1. Department of Building and Civil Engineering, Faculty of Architecture and Civil Engineering, University of Malta, Malta. josette.camilleri@um.edu.mt
Abstract
AIM: To investigate the physical properties of a novel accelerated Portland cement. METHODOLOGY: The setting time, compressive strength, pH and solubility of white Portland cement (Lafarge Asland; CEM 1, 52.5 N) and accelerated Portland cement (Proto A) produced by excluding gypsum from the manufacturing process (Aalborg White) and a modified version with 4 : 1 addition of bismuth oxide (Proto B) were evaluated. RESULTS: Proto A set in 8 min. The compressive strength of Proto A was comparable with that of Portland cement at all testing periods (P > 0.05). Additions of bismuth oxide extended the setting time and reduced the compressive strength (P < 0.05). Both cements and storage solution were alkaline. All cements tested increased by >12% of their original weight after immersion in water for 1 day with no further absorption after 28 days. Addition of bismuth oxide increased the water uptake of the novel cement (P < 0.05). CONCLUSIONS: The setting time of Portland cement can be reduced by excluding the gypsum during the last stage of the manufacturing process without affecting its other properties. Addition of bismuth oxide affected the properties of the novel cement. Further investigation on the effect that bismuth oxide has on the properties of mineral trioxide aggregate is thus warranted.
AIM: To investigate the physical properties of a novel accelerated Portland cement. METHODOLOGY: The setting time, compressive strength, pH and solubility of white Portland cement (Lafarge Asland; CEM 1, 52.5 N) and accelerated Portland cement (Proto A) produced by excluding gypsum from the manufacturing process (Aalborg White) and a modified version with 4 : 1 addition of bismuth oxide (Proto B) were evaluated. RESULTS: Proto A set in 8 min. The compressive strength of Proto A was comparable with that of Portland cement at all testing periods (P > 0.05). Additions of bismuth oxide extended the setting time and reduced the compressive strength (P < 0.05). Both cements and storage solution were alkaline. All cements tested increased by >12% of their original weight after immersion in water for 1 day with no further absorption after 28 days. Addition of bismuth oxide increased the water uptake of the novel cement (P < 0.05). CONCLUSIONS: The setting time of Portland cement can be reduced by excluding the gypsum during the last stage of the manufacturing process without affecting its other properties. Addition of bismuth oxide affected the properties of the novel cement. Further investigation on the effect that bismuth oxide has on the properties of mineral trioxide aggregate is thus warranted.
Authors: Arthur Dias Galarça; Wellington Luiz de Oliveira Da Rosa; Tiago Machado Da Silva; Giana da Silveira Lima; Neftalí Lenin Villarreal Carreño; Thiago Machado Pereira; Orlando Aguirre Guedes; Alvaro Henrique Borges; Adriana Fernandes da Silva; Evandro Piva Journal: Biomed Res Int Date: 2018-11-27 Impact factor: 3.411
Authors: Mario Tanomaru-Filho; Vanessa Morales; Guilherme F da Silva; Roberta Bosso; José M S N Reis; Marco A H Duarte; Juliane M Guerreiro-Tanomaru Journal: ISRN Dent Date: 2012-08-23
Authors: Roberta Bosso-Martelo; Juliane Maria Guerreiro-Tanomaru; Raqueli Viapiana; Fábio Luis Camargo Vilella Berbert; Maria Inês Basso Bernardi; Mario Tanomaru-Filho Journal: Int Sch Res Notices Date: 2015-02-23