Applicability of the standard specifications of ASTM C618 for evaluation of natural pozzolans

Pourkhorshidi, A.R.; Najimi, Meysam; Parhizkar, T; Jafarpour, F; Hillemeier, Bernd

doi:10.1016/j.cemconcomp.2010.08.007

Cited by 130 publications

(42 citation statements)

References 15 publications

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“…However, as it can be seen from Figure 6(a), there is no significant change in the water content even for the binder containing 30% VS which increased only by less than 3% compared to CEM I. This could be explained by the lubricant effect of natural pozzolan on paste when finely divided [1,18] and the effect of VS shape which was characterized by shape-edged grain [19]. The limestone filler, despite its higher fineness, generally demands less water than the corresponding pure cement.…”

Section: Water Requirementsmentioning

confidence: 78%

Improvement of the Early-Age Compressive Strength, Water Permeability, and Sulfuric Acid Resistance of Scoria-Based Mortars/Concrete Using Limestone Filler

al-Swaidani

Soud

Hammami

2017

Advances in Materials Science and Engineering

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Natural pozzolan is being widely used as cement replacement. Despite the economic, ecological, and technical benefits of its adding, it is often associated with shortcomings such as the need of moist-curing for longer time and a lower early strength. This study is an attempt to investigate the effect of adding limestone filler on the compressive strength and durability of mortars/concrete containing scoria. Sixteen types of binders with different replacement levels of scoria (0, 10, 20, and 30%) and limestone (0, 5, 10, and 15%) were prepared. The development of the compressive strength of mortar/concrete specimens was investigated after 2, 7, 28, and 90 days' curing. In addition, the acid resistance of the 28 days' cured mortars was evaluated after 90 days' exposure to 5% H 2 SO 4 . Concrete permeability was also evaluated after 2, 7, 28, and 90 days' curing. Test results revealed that there was an increase in the early-age compressive strength and a decrease in water penetration depths with adding limestone filler. Contrary to expectation, the best acid resistance to 5% H 2 SO 4 solution was noted in the mortars containing 15% limestone. Based on the results obtained, an empirical equation was derived to predict the compressive strength of mortars.

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Section: Water Requirementsmentioning

confidence: 78%

Improvement of the Early-Age Compressive Strength, Water Permeability, and Sulfuric Acid Resistance of Scoria-Based Mortars/Concrete Using Limestone Filler

al-Swaidani

Soud

Hammami

2017

Advances in Materials Science and Engineering

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“…As given in Table , the SAI is about 82%. As stated in previous studies, it should be mentioned that SAI is not a powerful criterion for specifying the pozzolanic activity of a material. This parameter is mainly a useful initial criterion for concrete manufacturers, but it is just a qualitative parameter without sufficient detail which will not be complicated enough to assess the effectiveness of a pozzolan.…”

Section: Resultsmentioning

confidence: 87%

Introduction of a mineral powder as a type of natural cementitious material in concrete: An experimental program

Fazilati

Golafshani

2019

Structural Concrete

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The principal air pollution within the concrete enterprise is cement in charge of roughly 5-7% of manufactured CO 2 emissions. For reducing CO 2 emissions and improving concrete properties, new types of natural cementitious materials have been served in concrete throughout the last two decades. In this study, a mineral powder (MP) as a type of supplementary cementitious material has been introduced and the chemical and physical properties of this MP and mechanical properties of the produced concrete were investigated. In this regard, the total number of 24 concrete mixes with 0 to 40% replacement of Portland cement (PC) with MP was designed. Concrete samples were tested for compressive, flexural, splitting tensile strengths, and elastic modulus at the age of 7, 28, 42, and 90 days. The experimental results indicate that the maximum compressive, flexural, and splitting tensile strengths are obtained by replacing about 5% PC with MP. Finally, the amount of CO 2 emission reduction for concrete specimens containing MP was evaluated. K E Y W O R D S CO 2 emissions, mechanical properties, mineral powder, supplementary cementitious material

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“…Factors affecting the activity of pozzolan are the content of SiO 2 + Al 2 O 3 + Fe 2 O 3 , the amorphous degree of their (7) The SiO 2 and Al 2 O 3 contents here can be obtained from chemical composition analysis and the amorphous phase content from XRD data, PAC for pozzolan could be calculated using Equation (7). PAC declares the proportion of the composition that exhibits pozzolanic activity and is able to react during the second hydration reaction, and provides a characteristic index of potential pozzolanic activity indicating the intrinsic capacity of a pozzolan to react with CH without consideration of particle size.…”

Section: Pozzolanic Activity Componentmentioning

confidence: 99%

“…[5] Wong and Askury [6] used tuff from Lawin, Grik in the Perak State of Malaysia to generate Portland fly ash cement to be used in oil well cementing. Pourkhorshidi et al [7] summarized the applicability of the standard ASTM C618 specifications for the evaluation of natural pozzolans (including trass, tuff, and pumice) in Iran.…”

Section: Introductionmentioning

confidence: 99%

Pozzolanic activity of volcanic rocks from Southern Jiangxi Province, China

Zhou

Deng

2015

Journal of Sustainable Cement-Based Materials

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The pozzolanic activity of volcanic rocks from southern Jiangxi Province, China, was studied in terms of material properties, pozzolanic reaction degree (PRD), and pozzolanic activity index. The pozzolanic activity component of the volcanic rocks calculated from chemical composition and amorphous phase content was appraised as a characteristic index of potential pozzolanic activity. The PRD of the volcanic rock was determined by hydrochloric acid dissolution. The pozzolanic activity index of the volcanic rocks was evaluated as the ratio of the compressive strength of the cement mortar blended with volcanic rock to that of a control cement mortar. The results showed that the volcanic rocks demonstrated great potential for pozzolanic activity in terms of pozzolanic activity component, PRD, and pozzolanic activity index, because they have high SiO 2 + Al 2 O 3 contents and plentiful amorphous phases. Finally, a consistent relationship between PRD and pozzolanic activity index was found.

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Applicability of the standard specifications of ASTM C618 for evaluation of natural pozzolans

Cited by 130 publications

References 15 publications

Improvement of the Early-Age Compressive Strength, Water Permeability, and Sulfuric Acid Resistance of Scoria-Based Mortars/Concrete Using Limestone Filler

Improvement of the Early-Age Compressive Strength, Water Permeability, and Sulfuric Acid Resistance of Scoria-Based Mortars/Concrete Using Limestone Filler

Introduction of a mineral powder as a type of natural cementitious material in concrete: An experimental program

Pozzolanic activity of volcanic rocks from Southern Jiangxi Province, China

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