Effect of Volcanic Ash and Natural Pozzolana on mechanical properties of sustainable cement concrete: A comprehensive review

Hamada, Hussein M.; Abed, Farid; Beddu, Salmia; Humada, AM; Majdi, Ali

doi:10.1016/j.cscm.2023.e02425

Cited by 10 publications

(3 citation statements)

References 76 publications

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“…Several studies carried out on PC systems with volcanic ash have shown that the presence of 0-30 wt.% volcanic ash causes a decrease in mechanical strength at early ages. On the other hand, with the increasing age, the strengths increased with higher volcanic ash contents [33]. In general, the presence of high levels of volcanic ash results in good workability, a high resistance to chloride penetration, high mechanical strength and good durability [34,35], despite the fact that these characteristics may not be displayed in MKPC systems due to the lack of chemical reactivity in the acid-base reaction.…”

Section: Introductionmentioning

confidence: 99%

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The Influence of the Magnesium-to-Phosphate Molar Ratio on Magnesium Potassium Phosphate Cement Properties Using Either Wollastonite or Volcanic Ash as Fillers

Padilla-Encinas,

Dieguez,

Cuevas

et al. 2024

Minerals

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The use of the fillers wollastonite and volcanic ash for the formulation of magnesium phosphate cements prepared at magnesium-to-phosphate molar ratios of 2, 3 and 4 has been investigated, with the objective of evaluating these formulations for the encapsulation of aluminium radioactive waste. The workability, mechanical strength, dimensional stability, pH, chemical composition and mineralogical properties of cement pastes and mortars were examined. All cement pastes presented fast setting, and the workability was only good at 3 and 4 M. The cement mortars presented high compressive strength and dimensional stability. K-struvite was confirmed as the sole reaction product of the reaction for all formulations. The pH of the cement pastes, measured in suspensions, achieved values in the range of 7.8 to 9.5 after the first days of setting, exceeding pH 8.5 for the 2 and 3 M formulations. pH values below 8.5 are theoretically preferred to avoid potential aluminium corrosion. Both fillers presented adequate characteristics (good workability, chemical compatibility) to be used in the formulation of magnesium phosphate cements. The increasing magnesium-to-phosphate molar ratio prevented unwanted efflorescence and increased the mechanical stability of the cement.

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Section: Introductionmentioning

confidence: 99%

“…The development of mechanical strength can vary depending on the size of the volcanic ash. The finer the ash, the higher the pozzolanic activity and strength [33].…”

Section: Introductionmentioning

confidence: 99%

The Influence of the Magnesium-to-Phosphate Molar Ratio on Magnesium Potassium Phosphate Cement Properties Using Either Wollastonite or Volcanic Ash as Fillers

Padilla-Encinas,

Dieguez,

Cuevas

et al. 2024

Minerals

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“…This raw material caused a decrease in the compressive strength of more than 25% when cement was replaced with a 25% content of pumice. Hamade et al [ 25 ] conducted a comprehensive review of the effects of pumice on the mechanical properties of cement concrete. In most of the analyzed research, an increase in the amount of pumice leads to a lower apparent density, a reduction in workability and a reduction in mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Physico-Mechanical Properties and Hydration Processes of Cement Pastes Modified with Pumice, Trass and Waste Chalcedonite Powder

Spychał,

Vyšvařil

2023

Materials

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In this article, the physico-mechanical properties and hydration processes of cement pastes containing three additives are introduced. Cement was replaced with pumice, trass, waste chalcedonite powder at 30% by mass and a combination of pumice or trass and waste chalcedonite powder in the amounts of 15% each. The main aim of this research was to assess the properties of two- or three-component binders to save cement in these binders. Rheological properties such as consistency, yield stress, viscosity and thixotropy were determined, in addition to porosity, 7-day and 28-day flexural and compressive strength and bulk density. Additionally, the heat evolution and degree of hydration of the tested pastes were compared. The use of all additives resulted in a reduction in the consistency of the tested pastes. The highest compressive strength measured after 28 days was observed for the cement paste with a 30% content of waste chalcedonite powder, which is related to it having the best pozzolanic activity of the materials used. The results of this research have confirmed that pumice, trass and waste chalcedonite powder can be used as components of blended Portland cements.

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Study on the activity, phase, thermal decomposition characteristics, microstructure, and chemical element of hardened cement powder under heating temperature of 100°C~1200°C

Ge,

Song,

Quan

et al. 2024

Structural Concrete

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The properties of thermoactivated hardened cement powder (HCP) are of great significance for the recycling and utilization of concrete waste. This paper focuses on heating activation of HCP under the temperature between 100 and 1200°C. The activity, phase changes and microstructure of thermoactivated HCP were analyzed. The results showed that HCP with heating temperature between 1000 and 1200°C showed high activity. Under the conditions of heating activation at 1200°C, water–binder ratio of 0.38 and curing time of 30 days, the compressive strength of the specimen made of HCP reached 17.56 MPa. When the heating temperature is between 700 and 1200°C, CSH gel is gradually decomposed into C2S and C3S. The chemical reaction products of cement and thermoactivated HCP are similar, both containing CaCO3, Ca(OH)2, AFt, Hydrotalcite, etc. Compared to the diffraction peaks of hydrated cement, the diffraction peaks of thermoactivated HCP are broadened and dispersed. The high Ca/Si and Al/Si ratios in the chemical reaction products of thermoactivated HCP are important reasons for the decrease in its mechanical properties.

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Effect of Volcanic Ash and Natural Pozzolana on mechanical properties of sustainable cement concrete: A comprehensive review

Cited by 10 publications

References 76 publications

The Influence of the Magnesium-to-Phosphate Molar Ratio on Magnesium Potassium Phosphate Cement Properties Using Either Wollastonite or Volcanic Ash as Fillers

The Influence of the Magnesium-to-Phosphate Molar Ratio on Magnesium Potassium Phosphate Cement Properties Using Either Wollastonite or Volcanic Ash as Fillers

Physico-Mechanical Properties and Hydration Processes of Cement Pastes Modified with Pumice, Trass and Waste Chalcedonite Powder

Study on the activity, phase, thermal decomposition characteristics, microstructure, and chemical element of hardened cement powder under heating temperature of 100°C~1200°C

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