Effect of volcanic tuff on the characteristics of cement mortar

Al-Zou’by, Jehad; Al‐Zboon, Kamel K.

doi:10.1590/s0366-69132014000200018

Cited by 18 publications

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“…Other problems have been seen in the production process of companies that focus on technological properties [ 13 ] rather than on the intrinsic characteristics of these materials [ 14 , 15 , 16 , 17 ]. The use of tuff as a pozzolan has increased in recent decades in many parts of the world [ 18 , 19 , 20 , 21 , 22 ], with well-known results. Volcanic tuffs can match and outperform other minerals and industrial rocks, such as zeolites, bentonites, perlites, pumicites, trachytes, rhyolites and kaolinites [ 23 , 24 , 25 , 26 , 27 , 28 ], with regards to their cementing properties.…”

Section: Introductionmentioning

confidence: 99%

Altered Volcanic Tuffs from Los Frailes Caldera. A Study of Their Pozzolanic Properties

et al. 2021

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This work presents the results of the study of the physical, chemical, mineralogical and pozzolanic properties of the altered volcanic tuffs (AVT) that lie in the Los Frailes caldera, south of the Iberian Peninsula, and demonstrates their qualities as pozzolans for the manufacturing of mortars and pozzolanic cements of high mechanical strength. The main objective of this research is to show to what extent the AVTs can replace portland cement (PC) in mortars, with standardised proportions of 75:25% and 70:30% (PC-AVT). To achieve these objectives, three AVT samples were studied by a petrographic analysis of thin section (PATS), DRX, FRX and MEB. The pozzolanic properties were determined by three methods: electrical conductivity (ECT), chemical pozzolanicity tests (CPT) at 8 and 15 days and mechanical strength tests (MS) of the specimens at 2, 7, 28 and 90 days. Studies of a PATS, DRX, FRX and MEB showed that the AVT samples’ constitutions are complex where smectite (montmorillonite), mordenite, quartz, halloysite, illite, kaolinite, volcanic glass and lithic fragments coexist. The results of the ECT and CPT tests confirmed the pozzolanic properties of the samples analysed and proved an increase in mechanical strength from 2 to 90 days of testing.

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Section: Introductionmentioning

confidence: 99%

Altered Volcanic Tuffs from Los Frailes Caldera. A Study of Their Pozzolanic Properties

et al. 2021

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“…They concluded that replacing 20% of fine aggregate with brown or grey tuff improved the concrete compressive strength by 10%, and 15% when yellow tuff was used. Al-Zou’by et al [ 17 ] investigated the impact of replacing sand with different levels of tuff replacement (25%, 50%, 75%, and 100% by weight) on concrete. Their results showed that the compressive and flexural strengths of samples containing 50% tuff increased significantly.…”

Section: Introductionmentioning

confidence: 99%

Chloride Diffusion and Acid Resistance of Concrete Containing Zeolite and Tuff as Partial Replacements of Cement and Sand

2017

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In this paper, the properties of concrete containing zeolite and tuff as partial replacements of cement and sand were studied. The compressive strength, water absorption, chloride ion diffusion and resistance to acid environments of concretes made with zeolite at proportions of 10% and 15% of binder and tuff at ratios of 5%, 10% and 15% of fine aggregate were investigated. The results showed that the compressive strength of samples with zeolite and tuff increased considerably. In general, the concrete strength increased with increasing tuff content, and the strength was further improved when cement was replaced by zeolite. According to the water absorption results, specimens with zeolite showed the lowest water absorption values. With the incorporation of tuff and zeolite, the chloride resistance of specimens was enhanced significantly. In terms of the water absorption and chloride diffusion results, the most favorable replacement of cement and sand was 10% zeolite and 15% tuff, respectively. However, the resistance to acid attack reduced due to the absorbing characteristic and calcareous nature of the tuff.

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“…The results demonstrate an increase in absorption with the increase of temperature and percentage of replacement of VA at 28 days age, except for the higher temperature case (500 and 800°C) where the control specimens exhibit the maximum absorption. Heating the specimen would increase the rate of absorption, as the water within the concrete would start evaporating after 100 °C [30]. The water within the hydrated cement can be classified into two categories; the evaporable water (water in the capillary pores and some water in the gel pores) and Non-evaporable water (nearly all chemically combined water and some water not held by chemical bonds) [18].…”

Section: Absorptionmentioning

confidence: 99%

Investigating the effect of elevated temperatures on the properties of mortar produced with volcanic ash

Mohamad

Al‐Hamd

Khaled

2020

Innov. Infrastruct. Solut.

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During the recent years, the use of pozzolanic materials (e.g. volcanic ash) in concrete and cement manufacturing has increased significantly since it can reduce the environment hazard associated with using Portland cement. In this paper, the effect of elevated temperatures on the physical and mechanical characteristics of building mortar produced with volcanic ash is experimentally explored. In order to evaluate the performance of the mortar, four different proportions of volcanic ash (0, 5, 15 and 25%)-as weight replacement of the cement-were prepared. A series of tests were conducted after 28, 90 and 120 days under different temperatures (25, 200, 500 and 800Cº). This paper demonstrates that the replacement of cement by a proportion of volcanic ash can sustain an acceptable level of compressive strength and improve the overall characterization of the mortar while reducing the amount of CO2 released. The mortar with 15% ratio of the volcanic ash replacement showed better flexural and the tensile strength. This paper also heights that the volcanic ash replacement affects the late-age properties of the mortar more than the early-age ones at both ambient and elevated temperatures.

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Effect of volcanic tuff on the characteristics of cement mortar

Cited by 18 publications

References 0 publications

Altered Volcanic Tuffs from Los Frailes Caldera. A Study of Their Pozzolanic Properties

Altered Volcanic Tuffs from Los Frailes Caldera. A Study of Their Pozzolanic Properties

Chloride Diffusion and Acid Resistance of Concrete Containing Zeolite and Tuff as Partial Replacements of Cement and Sand

Investigating the effect of elevated temperatures on the properties of mortar produced with volcanic ash

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