Mechanical and durability properties of cement mortar with Algerian natural pozzolana

Ghrici, Mohamed; Kenaï, Saïd; Meziane, El-Hadj

doi:10.1007/s10853-006-0227-0

Cited by 83 publications

(36 citation statements)

References 9 publications

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“…After two and three months of immersion, the flexural strength was higher for specimens immersed in sodium sulfate solutions (5% Na 2 SO 4 ) than that for specimens immersed in water. This could be due to the filling of pores by products resulting from the reaction of sodium sulfate with cement hydration products (Ca(OH) 2 ) to form gypsum and ettringite that gives a denser microstructure [11]. After this, the flexural strength is reduced because of micro cracking caused by the sulfate attack.…”

Section: Flexural Strengthmentioning

confidence: 99%

“…However, few investigations have been carried out to evaluate the effect of similar low reactivity slag on concrete durability under severe environmental conditions. Deteriorations of concrete are frequently observed in structures exposed to groundwater or soils containing high concentrations of sulfate, particularly in the south and south-east of Algeria and hence the need to investigate concrete sulphate resistance [11].…”

Section: Introductionmentioning

confidence: 99%

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Durability of mortar and concretes containing slag with low hydraulic activity

Hadjsadok

Kenaï

Courard

et al. 2012

Cement and Concrete Composites

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a b s t r a c tGranulated blast furnace slag has been widely used as a partial substitute for Portland cement in many applications because of advantages which include cost reduction, reduction in heat evolution and improvement of durability properties. However, the effectiveness of slag depends on its hydraulic reactivity. In this paper, the results of an experimental study on the effect of slag with low hydraulicity on the mechanical and durability properties of concrete and the performance of mortar under sulfate attack are discussed. Special attention is given to gas permeability and water absorption of slag concrete. The durability of slag concrete is improved at long term at low Water/Binder ratio. Sulfate resistance of mortar is improved by slag replacement up to 30%.

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Section: Flexural Strengthmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Durability of mortar and concretes containing slag with low hydraulic activity

Hadjsadok

Kenaï

Courard

et al. 2012

Cement and Concrete Composites

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“…In Syria, chemical attacks on concrete structures have caused serious damage to these concretes. According to previous studies (Ghrici et al, 2006;Ramezanianpour et al, 2010; Rodriguez-Camacho and Uribe-Afif, 2002), adding natural pozzolan led, through the pozzolanic reaction, to a refinement of the pore structure, resulting in a highly impermeable matrix. Further, a reduction in Ca(OH) 2 led to reductions in the formation of gypsum and ettringite.…”

Section: Introductionmentioning

confidence: 88%

Influence Of Volcanic Scoria On Mechanical Strength, Chemical Resistance And Drying Shrinkage Of Mortars

al-Swaidani¹,

Aliyan²,

Adarnaly³

et al. 2014

Building Research Journal

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In the study, three types of cement have been prepared; one CEM I type (the control sample) and two blended cements: CEM II/A-P and CEM II/B-P (EN 197-1), each of them with three replacement levels of volcanic scoria: (10 %, 15 %, 20 % wt.) and (25 %, 30 %, 35 % wt.), respectively. Strength development of mortars has been investigated at 2, 7, 28 and 90 days curing. Evaluation of chemical resistance of mortars containing scoria-based cements has been investigated through exposure to 5 % sulphate and 5 % sulphuric acid solutions in accordance with ASTM C1012 & ASTM 267, respectively. Drying shrinkage has been evaluated in accordance with ASTM C596. Test results showed that at early ages, the mortars containing CEM II/B-P binders had strengths much lower than that of the control mortar. However, at 90 days curing, the strengths were comparable to the control mortar. In addition, the increase of scoria significantly improved the sulphate resistance of mortars. Further, an increase in scoria addition improved the sulphuric acid resistance of mortar, especially at the early days of exposure. The results of drying shrinkage revealed that the CEM II/B-P mortar bars exhibited a greater contraction when compared to the control mortar, especially at early ages. However, drying shrinkage of mortars was not influenced much at longer times.

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“…The most commonly used cement in Kenya and most developing countries are the blended Portland cements [1]. The blended Portland cement concrete has lower compressive strengths at 28 days compared to Ordinary Portland cements concrete [2] [12] [13] [14] [15] [16]. The differences in the constituent materials also have an effect on the durability of concrete [17].…”

Section: Introductionmentioning

confidence: 99%

Influence of Constituent Materials Properties on the Compressive Strength of in Situ Concrete in Kenya

Okumu¹,

Shitote²,

Oyawa³

2017

OJCE

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The poor quality of Kenyan in situ concrete has necessitated research to establish the properties of the ingredient materials and their influence on the troubling rate of failure of reinforced concrete structures in the country during construction and usage. The compressive strength of concrete relies on the properties of the constituent materials, proportions of the mixture, workmanship, compaction method and curing conditions. This paper outlines findings of an experimental investigation on the properties of Kenyan concrete ingredient materials and their influence on the compressive strength of concrete in Kenya. Three types of cements (42.5N, 32.5R, 32.5N) from six different cement manufacturers and fine aggregates from three different regions in the country were used during the study. Cements and aggregates chemical analysis was done using the Atomic Absorption Spectrometer machine while the physical and the mechanical properties were checked based on the British Standards. The British DOE concrete mix design method was used to generate the concrete mix proportion and concrete was tested for early and ultimate compressive strengths at 7, 14 and 28 days. It was observed that the different cement brands have varying properties with CEM A having the highest ultimate compressive and flexural strengths. It was further noted that aggregates from the coastal region produced concrete of higher compressive strengths. When the commonly used mix design method was adopted, blended Portland cements produced concrete with ultimate compressive strengths lower than the designed target strengths. The study therefore recommends the development of a concrete mix design procedure for blended cement concrete production in Kenya.How to cite this paper:

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Mechanical and durability properties of cement mortar with Algerian natural pozzolana

Cited by 83 publications

References 9 publications

Durability of mortar and concretes containing slag with low hydraulic activity

Durability of mortar and concretes containing slag with low hydraulic activity

Influence Of Volcanic Scoria On Mechanical Strength, Chemical Resistance And Drying Shrinkage Of Mortars

Influence of Constituent Materials Properties on the Compressive Strength of in Situ Concrete in Kenya

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