A review on the evolution of Portland cement and chemical admixtures in Brazil

Natalli, Juliana Fadini; Thomaz, Eduardo Christo Silveira; Mendes, Júlia Castro; Peixoto, Ricardo André Fiorotti

doi:10.1590/s1983-41952021000600003

Cited by 13 publications

(7 citation statements)

References 20 publications

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“…The materials used in this work comprised bio-aggregates, Mauá/LafargeHolcim’s cement Type V-ARI (equivalent to the European CEM I 52.5N [ 27 ], from Rio de Janeiro, Brazil —its chemical composition is shown in Table 2 ), mineral coarse aggregates (oblong-shaped crushed granite), and distilled water.…”

Section: Methodsmentioning

confidence: 99%

Bond Behavior of a Bio-Aggregate Embedded in Cement-Based Matrix

Ferreira

Andrade

et al. 2022

Materials

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This paper investigates the bond behavior between a bio-aggregate and a cement-based matrix. The experimental evaluation comprised physical, chemical, image, and mechanical characterization of the bio-aggregate. The image analyses about the bio-aggregate’s outer structure provided first insights to understand the particularities of this newly proposed bio-aggregate for use in cementitious materials. A mineral aggregate (granitic rock), largely used as coarse aggregate in the Brazilian civil construction industry, was used as reference. The bond behavior of both aggregates was evaluated via pull-out tests. The results indicated that both aggregates presented a similar linear elastic branch up to each respective peak loads. The peak load magnitude of the mineral aggregate indicated a better chemical adhesion when compared to the bio-aggregate’s. The post-peak behavior, however, indicated a smoother softening branch for the bio-aggregate, corroborated by the microscopy image analyses. Although further investigation is required, the macaúba crushed endocarp was found to be a thriving bio-material to be used as bio-aggregate.

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Section: Methodsmentioning

confidence: 99%

Bond Behavior of a Bio-Aggregate Embedded in Cement-Based Matrix

Ferreira

Andrade

et al. 2022

Materials

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“…Six pastes were mixed in a contact vortex mixer for 2 minutes at 3000 rpm, one with plain cement and water (reference) and others with cement substitution levels of 5, 10, 15, 20, and 25% BWOC of CHA, while keeping the same w/c. The cement used in this stage was CP V Portland cement, which met the Brazilian specifications of NBR 16697 [35] (equivalent to the European CEM I 52.5N [36]).…”

Section: Proportionmentioning

confidence: 99%

The influence of coffee husk ash as a filler addition in mechanical and hydration properties of cement pastes

Miranda,

Marcelino,

Kuhn

et al. 2024

JER

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In view of the environmental impacts caused by the construction and agroindustry industries, the aim of this work is to evaluate the potential application of coffee husk ash (CHA) as a filling element in cement pastes. For this purpose, coffee husks and their ashes were characterized. Cement pastes, with a water-to-cement ratio of 0.4, were then produced with different amounts of CHA (5, 10, 15, 20 and 25% BWOC), burned at 600°C for 3 h, and characterized. The results showed that CHA had a high content of alkalis. A reduction in the amount and kinetics of calcium hydroxide formation was observed in the pastes. In the semiadiabatic calorimetry test, it seems that the increase in CHA content leads to hydration kinetic acceleration and an increase in the cumulative heat for up to 40 hours of hydration, indicating an effective filler effect caused by CHA.

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“…Thermal properties by differential scanning calorimetry (DSC) Finally, the following materials comprise the cementitious matrix mix constituents: Portland cement CP II F32 (equivalent to the European CEM II [38], manufactured by CSN company at Serra, ES, Brazil); metakaolinite (manufactured by Metacaulim do Brasil, at Jundiaí, SP, Brazil); river sand passing through a 1.19-mm sieve; fly ash; BASF's MasterGlenium 51 superplasticizer (PA type) with a solids content of 51%.…”

Section: Typical Value Unitmentioning

confidence: 99%

PCM-Impregnated Textile-Reinforced Cementitious Composite for Thermal Energy Storage

et al. 2023

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The growing global energy demand requires solutions that improve energy efficiency in all sectors. The civil construction sector is responsible for a large part of global energy consumption. In this context, phase change materials (PCMs) can be incorporated into construction materials to improve the energy efficiency of buildings. The purpose of this study was to incorporate a PCM to jute fabric, applying it in civil construction as a reinforcement for cement matrices. In order to do that, a method of immersing jute fabric in liquid phase change material, and then coating it with a polymer, was proposed. Treated jute fabric was then used to produce a laminated composite with a cementitious matrix. Morphological, mechanical and chemical characterization of jute textiles was performed, as well as an analysis of the composites’ mechanical and thermal behavior. The results verified that jute textiles absorbed 102% PCM in weight, which was successfully contained in the capillary porosity of jute. The PCM was able to delay the composite’s temperature increase by up to 24 °C. It was concluded that this method can be used to incorporate PCM to natural textiles, producing composites with thermal energy storage properties.

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A review on the evolution of Portland cement and chemical admixtures in Brazil

Cited by 13 publications

References 20 publications

Bond Behavior of a Bio-Aggregate Embedded in Cement-Based Matrix

Bond Behavior of a Bio-Aggregate Embedded in Cement-Based Matrix

The influence of coffee husk ash as a filler addition in mechanical and hydration properties of cement pastes

PCM-Impregnated Textile-Reinforced Cementitious Composite for Thermal Energy Storage

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