Preparation and characterization of one-part non-Portland cement

Abdel‐Gawwad, Hamdy A.; El-Aleem, S. Abd; Ouda, Ahmed S.

doi:10.1016/j.ceramint.2015.08.096

Cited by 64 publications

(6 citation statements)

References 27 publications

(27 reference statements)

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“…The mixing water content plays an important role in the dissolution/condensation process [45]. As prviousely stated [40], the use of low water during activation process plays a circular role in the control of condensation rate. The addition of low water content, followed by drying, causes a retardation in the condensation process, forming DAS with high activated species content.…”

Section: Characterization Of Dasmentioning

confidence: 98%

“…It is recognized that the enhancement of hydration products' content strongly re ects on the mechanical properties of the hydrated cement [40,46,58,66,67]. Accordingly, a relationship between compressive strength and hydration products content (determined by TG-analysis) within cement pastes hydrated for 28-days was represented in…”

Section: Phase Identi Cationmentioning

confidence: 99%

“…The activated slurry immediately dried at 80 ºC for 24 h, followed by grinding to yield DAS-powder. The W/BFS ratio of 0.1 was chosen according to previously published work [40], which reported that W/BFS ratio of 0.1 is appropriate water content for the formation of alkali-activated powder with high capability to re-interact with water, yielding hardened materials. One-part-HC was prepared by mixing DAS with OPC at different weights equivalent to 70 wt.…”

Section: Preparation Of One-part Hybrid Cement Powdermentioning

confidence: 99%

See 2 more Smart Citations

An Innovative Method for the Sustainable Utilization of Blast-furnace Slag in the Cleaner Production of One-part Hybrid Cement

Fayed

El-Hosiny

El-Kattan

et al. 2021

Preprint

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Hybrid cement (HC) can be defined as alkali activated-blended-Portland cement (PC). It was prepared by the addition of an alkaline solution to high-volume aluminosilicate-blended-PC. Although this cement exhibits higher mechanical performance compared to conventional blended one (aluminosilicate-PC blend), it represents lower commercial viability because of the corrosive nature of an alkaline solution. Therefore, this study focuses on the preparing one-part-HC using dry activator-based blast-furnace slag (DAS). DAS was prepared by mixing sodium hydroxide (NaOH) with blast-furnace slag (BFS) at low water to BFS ratio, followed by drying and grinding to yield DAS-powder. Different contents of DAS (equivalent to 70 wt.% BFS and 1, 2, and 3 wt.% NaOH) were blended with 30 wt.% PC. A mixture containing 70 wt.% BFS and 30 wt.% PC was used as a reference sample. The mortar was adjusted at sand: powder (BFS-PC and/or DAS-PC) weight ratio of 3: 1. The microstructural analysis proved that DAS-powder is mainly composed of sodium calcium aluminosilicate activated species and unreacted BFS. These species can interact again with water to form calcium aluminum silicate hydrate (C-A-S-H) and NaOH, suggesting that the DAS acts as NaOH-carrier. One-part HC-mortars having 1, 2, and 3 wt.% NaOH recorded 7-days compressive strength values 82, 44, and 27 %, respectively, higher than that of the control sample. At 180-days of curing, a significant reduction in compressive strength was observed within HC-mortar having 3 wt.% NaOH. This could be attributed to the increase of Ca (within C-S-H) replacement by Na, forming Na-rich-phase with lower binding capacity. The main hydration products within HC are C-S-H, C-A-S-H, and chabazite as one of zeolite family.

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Section: Characterization Of Dasmentioning

confidence: 98%

Section: Phase Identi Cationmentioning

confidence: 99%

Section: Preparation Of One-part Hybrid Cement Powdermentioning

confidence: 99%

See 1 more Smart Citation

An Innovative Method for the Sustainable Utilization of Blast-furnace Slag in the Cleaner Production of One-part Hybrid Cement

Fayed

El-Hosiny

El-Kattan

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…Moreover, as for "two-part" AAMs, 2 of 14 different types of aluminosilicate precursors and activators are used, thus the properties of the final products depend on the characteristics and reactivity of the initial raw materials [2]. The most common precursor is fly ash (FA) from coal combustion either alone or coupled with ground granulated blast furnace slag (GGBFS) [3][4][5][6]. The latter is commonly added as calcium-rich precursor for AAMs to improve the reactivity of low-calcium fly ash [7].…”

Section: Introductionmentioning

confidence: 99%

One-Part Alkali-Activated Pastes and Mortars Prepared with Metakaolin and Biomass Ash

2020

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Common alkali-activated materials (AAMs) are usually manufactured with highly alkaline solutions. However, alkaline solutions are dangerous for workers who must wear gloves, masks, and glasses when handling them. This issue makes common (or two-part) AAMs not user-friendly and problematic for bulk production if no safety procedures are followed. In this paper, the possibility of manufacturing alkali-activated pastes and mortars without alkaline solution is investigated. These innovative one-part AAMs have been prepared with metakaolin as the aluminosilicate precursor, potassium-rich biomass ash as the alkaline activator, and water. AAMs have been prepared by varying the K/Al molar ratio: pastes have been studied in terms of reaction kinetics, through isothermal calorimetry, and mortars have been tested in terms of mechanical compressive strength. Results show that the K/Al molar ratio governs both the reaction kinetics and the mechanical strength of these innovative materials. The highest compressive strength is obtained when the K/Al ratio is equal to 2.5 and the water/solid ratio is equal to 0.49. If biomass ash is heated at 700 °C to decompose the calcium carbonate, its reactivity and the final compressive strength increase.

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“…Geopolymers are derived from the reactions between the aluminosilicate materials and alkaline solutions, which are considered as promising alternative cementing materials for Portland cement due to the lower greenhouse gases emissions and utilization of solid waste . However, the corrosive and viscous nature of the alkaline solutions have become an obstacle to the large‐scale applications of geopolymers and its commercial development . In order to produce commercial available geopolymeric products, a new concept for geopolymer preparation, namely by one‐part geopolymer and addition of water to the geopolymeric precursors, has been proposed.…”

Section: Introductionmentioning

confidence: 99%

Preparation of one‐part geopolymeric precursors using vanadium tailing by thermal activation

2019

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The main purpose of this study is to develop a user‐friendly one‐part geopolymer using vanadium tailing (VT). Geopolymeric precursor consists of activated VT and metakaolin that can react directly with water to form geopolymers. The roasting temperature plays an important role in the VT activation, which affects the compressive strength of the final geopolymer. The geopolymer with accepted compressive strength, that is 29.0 MPa after 7 days curing in ambient condition, can be prepared using VT after thermal activation at appropriate temperature (400‐600°C). As the roasting temperature is increased to 700°C, the VT is molten and sintered and the ability of providing alkaline and Si4+ is drastically weakened, which results in a poor compressive strength geopolymer.

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Preparation and characterization of one-part non-Portland cement

Cited by 64 publications

References 27 publications

An Innovative Method for the Sustainable Utilization of Blast-furnace Slag in the Cleaner Production of One-part Hybrid Cement

An Innovative Method for the Sustainable Utilization of Blast-furnace Slag in the Cleaner Production of One-part Hybrid Cement

One-Part Alkali-Activated Pastes and Mortars Prepared with Metakaolin and Biomass Ash

Preparation of one‐part geopolymeric precursors using vanadium tailing by thermal activation

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