Marios Soutsos
Queen's University Belfast, SPACE - Civil Engineering, Faculty Member
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This paper presents experimental tests carried out on steel fibre reinforced concrete samples, including mechanical tests as well as with non destructive techniques: electrical resistivity and X-ray. Samples are round panels poured in the... more
This paper presents experimental tests carried out on steel fibre reinforced concrete samples, including mechanical tests as well as with non destructive techniques: electrical resistivity and X-ray. Samples are round panels poured in the laboratory in different ways in order to influence the fibre distribution. Electrical resistivity measurements are done as a blind test, to characterise the electrical anisotropy and deduce the orientation of fibres. These results are compared to X-Ray imaging to check the quality of non destructive evaluation. Then, mechanical tests are done to assess the influence of fibres distribution on concrete properties. Flexural and compressive strength are measured on specimens. The influence of fibres orientation is clearly shown. Non destructive characterisation of samples allows the fibres distribution in the concrete to be determined. The influence of this parameter is also clearly shown by the mechanical approach. Résumé Les travaux présentés dans ce...
Coal fly ash (FA) is of high interest as a precursor material for the synthesis of geopolimer binder, representing a waste stream which is readily available from existing industry [1]. FA is not a “standard product” as its physical and... more
Coal fly ash (FA) is of high interest as a precursor material for the synthesis of geopolimer binder, representing a waste stream which is readily available from existing industry [1]. FA is not a “standard product” as its physical and chemical properties vary not only from source to source but also over time from the same power station [2]. UK Department of Energy and Climate Change listed 14 coal fuelled power stations operational in 2014, representing 26% of total generated [3]. FA production in UK is estimated at about 6∙106 t per annum, half of which is sent to landfill, whereas about 114∙106 t of FA is available in stockpiles [4], confirming a significant potential availability for FA-based geopolymer concrete production. The suitability of such available ashes has not been thoroughly investigated yet. This paper analyses the factors affecting the reactivity of FA for the synthesis of geopolymer concrete, investigating physical and chemical properties of precursor materials, a...
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The concrete mixes used in this study had 28 d mean strengths of 50 and 30 MPa and also had Portland cement (PC) partially replaced with ground granulated blast-furnace slag (GGBS) and fly ash (FA). These mixes were the same as those used... more
The concrete mixes used in this study had 28 d mean strengths of 50 and 30 MPa and also had Portland cement (PC) partially replaced with ground granulated blast-furnace slag (GGBS) and fly ash (FA). These mixes were the same as those used in a UK-based project that involved casting of blocks, walls and slabs. The strength development of ‘equivalent’ mortar mixes was determined in the laboratory for curing temperatures of 10, 20, 30, 40 and 50°C. High curing temperatures were found to have a beneficial effect on the early-age strength, but a detrimental effect on the long-term strength. GGBS was found to be more sensitive to high curing temperatures than PC and FA, as reflected in its higher ‘apparent’ activation energy. The accuracy of strength estimates obtained from maturity functions was examined. The temperature dependence of the Nurse–Saul function (i.e. concrete strength gain rate varies linearly with temperature) was not sufficient to account for the improvement in early-age ...
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ABSTRACT
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Two maturity functions, the Nurse-Saul and one based on the Arrhenius equation have been examined to determine their applicability for in-situ strength prediction of concretes made with pulverised fuel ash (PFA). Results from a PFA... more
Two maturity functions, the Nurse-Saul and one based on the Arrhenius equation have been examined to determine their applicability for in-situ strength prediction of concretes made with pulverised fuel ash (PFA). Results from a PFA concrete mix with 30% of its binder being PFA were compared to a Portland cement concrete mix with similar 28-day target mean strength. The strength
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Page 1. RILEM State-of-the-Art Reports Denys Breysse Editor Non-Destructive Assessment of Concrete Structures: Reliability and Limits ofSing|e and Combined Techniques State-of-the-Art Report of the RILEM Technical Committee 207-INR... more
Page 1. RILEM State-of-the-Art Reports Denys Breysse Editor Non-Destructive Assessment of Concrete Structures: Reliability and Limits ofSing|e and Combined Techniques State-of-the-Art Report of the RILEM Technical Committee 207-INR |-"lam Q Springer Page 2. ...
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This paper presents experimental tests carried out on steel fibre reinforced concrete samples, including mechanical tests as well as non-destructive technique (electrical resistivity) and non destructive technique on cores (X-ray).... more
This paper presents experimental tests carried out on steel fibre reinforced concrete samples, including mechanical tests as well as non-destructive technique (electrical resistivity) and non destructive technique on cores (X-ray). Electrical resistivity measurements are done as a blind test, to characterise the electrical anisotropy and deduce the distribution and the orientation of fibres. These results are compared to X-ray imaging
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Page 1. Chapter 3 Ground Granulated Blast Furnace Slag 3.1 Introduction Ground granulated blast furnace slag (GGBS) is a by-product from the blast-furnaces used to make iron. Blast-furnaces are fed with controlled mixture ...
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A full scale insitu reinforced concrete building frame built in a laboratory provided an opportunity to assess the use of the in-situ pull-out test on a systematic basis during construction. Interpretation of strength correlations should... more
A full scale insitu reinforced concrete building frame built in a laboratory provided an opportunity to assess the use of the in-situ pull-out test on a systematic basis during construction. Interpretation of strength correlations should take into account the ...