scholarly journals Effect of elevated temperature on strain-hardening engineered cementitious composites

2014 ◽  
Vol 69 ◽  
pp. 370-380 ◽  
Author(s):  
Prakash S. Bhat ◽  
Vivian Chang ◽  
Mo Li
2013 ◽  
Vol 683 ◽  
pp. 46-50
Author(s):  
Heng Mao Niu ◽  
Yong Ming Xing ◽  
Yan Ru Zhao

Engineered cementitious composites(ECC) are characterized by strain hardening and tight crack width control. Good fiber distribution can maximize fiber contribution at each stage of the crack bridging process. However, poor fiber distribution can be disadvantage to fiber contribution, even influence the robustness of strain-hardening. Combined with the latest research results, this review highlights the methods of improving fiber distribution in ECC. Good fiber distribution is based on excellent matrix fluidity, which can be determined by mineral admixtures, admixture and water/binder (w/c). Fiber included surface morphology, size and content of fiber have also an effect on fiber distribution in the ECC. Additionally, slag and sand size shape of matrix components play a surprising role on fiber distribution. Based on the reviewed methods it is argued that fiber optimization and matrix components tailoring can be used to improve fiber distribution.


2022 ◽  
Vol 30 (1) ◽  
pp. 433-449
Author(s):  
Mohamad Hakimin Khazani ◽  
Oh Chai Lian ◽  
Lee Siong Wee ◽  
Mohd Raizamzamani Md Zain ◽  
Norrul Azmi Yahya

This paper discusses the quantitative bibliographic data derived from scientific publications on Engineered Cementitious Composites (ECC) subjected to elevated temperature, the influence of elevated temperature on the mechanical properties, particularly the compressive strength and microstructure behavior of Engineered Cementitious Composites (ECC) mixtures based on the review of previous pieces of literature. Systematic literature reviews were employed as the methodology in this study. The age of related publications selected to be reviewed was limited to publications for the past ten years, 2010 to December 2020. It was found from available research that exposure of the ECC specimen at the elevated temperature starting from 200oC significantly reduced the compressive strength when the temperature increases, melting of fiber and increase of porosity causes the dramatically increase micro-cracks.


2013 ◽  
Vol 709 ◽  
pp. 122-126
Author(s):  
Heng Mao Niu ◽  
Yong Ming Xing ◽  
Yan Ru Zhao

Engineered cementitious composites (ECC) are characterized by strain hardening and tight crack width control. Good fiber distribution can maximize fiber contribution. Processing can substantially influence fiber distribution, and consequently influence mechanical performance. Combined with the latest research results, this review summarizes the results of several studies in which the influence of processing on fiber distribution and mechanical performance was investigated. Based on the reviewed methods it is argued that the processing technique of producing ECC can improve fiber distribution.


2019 ◽  
Vol 8 (3) ◽  
pp. 50-61
Author(s):  
Sabrine Eduarda Tonioli

O setor da construção civil é considerado um dos maiores emissores de CO2 (dióxido de carbono) na atmosfera, tornando-se um setor estratégico na busca pela sustentabilidade. A literatura indica que materiais à base de cimento Portland podem capturar CO2 da atmosfera, em poucas idades, através da carbonatação acelerada. Este trabalho objetiva estudar a influência da carbonatação acelerada nas propriedades mecânicas de um compósito cimentício à base de cimento Portland (ECC – Enginereed Cementitious Composites), reforçado com fibras de PVA (Acetato de Polivinila). O compósito foi hidratado sob duas condições: baixa e alta umidade relativa. Foram realizados ensaios mecânicos, de termogravimetria e de termogravimetria derivativa. Os resultados apontam que a cura úmida beneficia as propriedades mecânicas da matriz, uma vez que favorece as reações de hidratação do cimento, e que a carbonatação acelerada, contribui para o aumento de tensão de primeira fissura. Percebeu-se também que o modo de cura preliminar do compósito influenciou na formação dos produtos hidratados. Identificou-se ainda que a carbonatação não inibe as características de strain hardening do compósito cimentício, tornando possível a sua utilização sob efeito da carbonatação acelerada.


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