Reducing variations in the test results of self-consolidating lightweight concrete by incorporating pozzolanic materials

AzariJafari, Hessam; Tajadini, Azim; Rahimi, Motahareh; Berenjian, Javad

doi:10.1016/j.conbuildmat.2018.01.121

Cited by 20 publications

(9 citation statements)

References 26 publications

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“…The overuse of natural aggregate in the construction sector has harmed the environment in recent decades, and it is estimated that about 7.5 billion tonnes of aggregates are annually consumed by the concrete industry [1][2][3][4][5]. This environmental issue can be somewhat solved by partial replacement of natural aggregates with artificial lightweight aggregates in the building process [6][7][8][9][10]. Although the use of lightweight concrete (LC) dates back to the Roman Empire, modern age artificial lightweight aggregates were produced in the middle of the 20 th century and then they were developed by researchers in the concrete industry [11,12].…”

Section: Introductionmentioning

confidence: 99%

Effect of the curing type on the mechanical properties of lightweight concrete with polypropylene and steel fibres

Madandoust

Kazemi

Talebi

et al. 2019

Construction and Building Materials

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This study assessed the effect of steel and polypropylene fibres at various volume contents on concrete incorporating lightweight expanded clay aggregate (LECA) and water/binder (W/B) ratios of 0.37 and 0.42. The concrete specimens were cured under six curing conditions: wet, 3-day wet, 14-day wet, air-dry controlled, air-dry uncontrolled, and 90 °C vapour. The use of lightweight aggregates in the construction industry has drawn the attention of researchers and, on the other hand, fibres with a high strain-hardening response can be used as an appropriate addition in concrete materials. In this study, the mechanical properties of lightweight concrete containing steel or polypropylene fibres were evaluated by means of compressive strength, splitting tensile strength and modulus of elasticity tests at 3, 7, 28 and 60 days. According to the results, fibre reinforced concrete mixes containing LECA, cured under 90 °C vapour curing, achieved the highest mechanical strength. In addition, the optimum contents of steel fibres to obtain the highest compressive and splitting tensile strengths of lightweight concrete were 1% and 3%, respectively.

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Section: Introductionmentioning

confidence: 99%

Effect of the curing type on the mechanical properties of lightweight concrete with polypropylene and steel fibres

Madandoust

Kazemi

Talebi

et al. 2019

Construction and Building Materials

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“…The colorimetric method of spraying silver nitrate is widely used in experimental works in which the tested concrete is found in saturation conditions and free from the carbonation process. Many works published in recent years in high-impact magazines (such as : Ferreira et al, 2016;Weiss et al, 2017;Wei et al, 2018;He et al, 2018;Slomka-Slupik et al, 2018;Fernández-Ruiz et al, 2018;Lau et al, 2018;Azarijafari et al, 2018) confirm its frequent use in current research. However, some studies (França, 2011;Real et al, 2015) point out that the silver ions (Ag+) in the silver nitrate solution react with the carbonation product CO3, forming Ag2CO3, which also gives a whitish color to the concrete.…”

Section: Relevance Of the Themementioning

confidence: 85%

Procedimento para detectar a penetração de cloretos com nitrato de prata em concreto carbonatado

Pontes

Reus²,

Calvo

et al. 2021

Revista de la Asociación Latinoamericana de Control de Calidad,

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Este trabalho tem por objetivo principal propor um procedimento padrão para a utilização do método colorimétrico para medir a profundidade de penetração de cloretos nas inspeções de estruturas de concreto em que existe a exposição aos cloretos e à carbonatação simultaneamente. Para evitar a ocorrência de resultados "falsos positivos" foram testadas as soluções de hidróxido de cálcio (Ca(OH)₂) e hidróxido de sódio (NaOH) como tratamento prévio. Os testes foram conduzidos em amostras apenas carbonatadas e em amostras contaminadas por cloretos e carbonatadas. Os resultados mostram que a solução de NaOH elimina a interferência da carbonatação. Desse modo, chegou-se a indicação de um método adequado para introdução de leituras de profundidade de contaminação por cloretos nas inspeções do concreto em campo.

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“…Another parameter to determine the correct distribution of the data is the variation coefficient, expressed as a percentage ratio between the standard deviation and the average of the measurements. Low coefficient-of-variation values indicate that the concrete cubes were packaged with accuracy [ 84 ]. Low coefficients of variation are therefore observed for porphyry and metamorphic samples, while slightly higher for mixtures with calcareous aggregates ( Table 17 ).…”

Section: Discussionmentioning

confidence: 99%

Petrographic and Physical-Mechanical Investigation of Natural Aggregates for Concrete Mixtures

2021

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The availability of different lithology with which concrete can be packaged could create substantial questions on the differences that they can provide to the same mixture. Different kinds of aggregates were analyzed individually to investigate their main characteristics, which allowed us to package five types of concrete mixtures. These five mixtures were compared to each other through compressive strength values. Furthermore, it was considered microscopically what possible differences could exist between these different mixtures, for example, differences in the cement/aggregate reaction. The chemical characterization of the aggregates, used as the skeleton of the cement mixes, was proposed as an important investigative phase in order to better understand the differences in the geotechnical and physical-mechanical characteristics and to verify the presence of any harmful phases for the durability of the concrete.

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Reducing variations in the test results of self-consolidating lightweight concrete by incorporating pozzolanic materials

Cited by 20 publications

References 26 publications

Effect of the curing type on the mechanical properties of lightweight concrete with polypropylene and steel fibres

Effect of the curing type on the mechanical properties of lightweight concrete with polypropylene and steel fibres

Procedimento para detectar a penetração de cloretos com nitrato de prata em concreto carbonatado

Petrographic and Physical-Mechanical Investigation of Natural Aggregates for Concrete Mixtures

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