Metakaolin

Khatib, Jamal; Baalbaki, Oussama; Elkordi, Adel

doi:10.1016/b978-0-08-102156-9.00015-8

Cited by 38 publications

(14 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It has become a known fact that the partial replacement of Portland cement with supplementary cementitious materials (SCMs) is the most realistic and attainable solution to reduce the release of greenhouse gases associated with cement and concrete production. Clays, heat-treated at an appropriate temperature (usually between 600-900 o C ) [1], have been demonstrated as suitable for use as SCM in concrete [2][3][4][5][6]. This is mostly due to the fact that clays are available in many regions in relatively large quantities as compared to popular SCMs such as pulverised fly ash, ground granulated blast furnace slag (GGBS) and silica fume [7,8].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Potential of Calcined Brick Clay as a Partial Substitution in Blended Cement Mortars

Khorami

2022

JOJMS

View full text Add to dashboard Cite

Calcined kaolinitic clays, among other supplementary cementitious materials, have been acknowledged as having a good potential to reduce the CO2 emissions associated with cement and concrete production. However, little attention has been given to impure kaolinitic clays which are usually used in the manufacture of burnt bricks and other products. This paper has studied the potential use of less pure kaolinitic clay, which is normally used in brick production, as a pozzolan in blended cement mortar. X-ray diffraction studies revealed the presence of kaolinite, illite and quartz in the clay. The clay was calcined at 600 o C and 700 o C and blended with Portland cement at weight percentages of 10, 20 and 30. From the Frattini test, clay calcined at 700 o C showed a better pozzolanic reactivity than that calcined at 600 o C . Blended cements containing 700 o C calcined clay recorded lower water demand and setting times as compared to 600 o C calcined clay. There was a reduction in compressive strength at all replacement levels, both at early and later ages. Mortar containing 700 o C calcined clay recorded higher compressive strength than the clay calcined at 600 o C .

show abstract

Section: Introductionmentioning

confidence: 99%

“…This fast reactivity is mainly due to the abundant formation of highly reactive 5-fold coordinated Al sites in kaolinite during heat treatment [8][9][10][11]. As a result, several researchers, in the past years, have studied the performance of calcined kaolinitic clays in cementitious materials systems [2,12,13].…”

Section: Introductionmentioning

confidence: 99%

Potential of Calcined Brick Clay as a Partial Substitution in Blended Cement Mortars

Khorami

2022

JOJMS

View full text Add to dashboard Cite

show abstract

“…At room temperature, this system had setting problems, and its compressive strength was inadequate at high temperatures (80°C). However, the work by Istuque et al (30) (32); moreover, it is desirable to increase the content of SSA in the mixtures because immobilization will be a key issue in the SSA sustainable management.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the long-term compressive strength development of the sewage sludge ash/metakaolin-based geopolymer

et al. 2021

View full text Add to dashboard Cite

This paper aimed to evaluate the long-term compressive strength development of the sewage sludge ash/metakaolin (SSA/MK)-based geopolymer. SSA/MK-based geopolymeric mortars and pastes were produced at 25ºC with different SSA contents (0 - 30 wt.%). Compressive strength tests were run within the 3-720 curing days range. A physicochemical characterisation (X-ray diffraction and scanning electron microscopy) was performed in geopolymeric pastes. All the geopolymeric mortars presented a compressive strength gain with curing time. The mortars with all the SSA evaluated contents (10, 20, 30 wt.%) developed a compressive strength over 40 MPa after 720 curing days at 25ºC. The maximum compressive strength of the mortars with SSA was approximately 61 MPa (10 wt.% of SSA), similarly to the reference mortar (100% MK-based geopolymer). The microstructure analyses showed that the SSA/MK-based geopolymer presented a dense microstructure with N-A-S-H gel formation.

show abstract

“…Another common aluminosilicate source very low in calcium is metakaolin, a pozzolanic material obtained through the dehydroxylation of the clay mineral kaolinite at temperatures between 650 °C and 750 °C [ 37 , 40 , 41 ]. Novais et al investigated the mineralogical and chemical composition of metakaolin and fly ash and determined the amorphous SiO 2 and Al 2 O 3 and the crystalline phases quartz, muscovite and anatase as the main components of metakaolin.…”

Section: Introductionmentioning

confidence: 99%

Natural Fiber-Stabilized Geopolymer Foams—A Review

et al. 2020

View full text Add to dashboard Cite

The development of sustainable, environmentally friendly insulation materials with a reduced carbon footprint is attracting increased interest. One alternative to conventional insulation materials are foamed geopolymers. Similar to foamed concrete, the mechanical properties of geopolymer foams can also be improved by using fibers for reinforcement. This paper presents an overview of the latest research findings in the field of fiber-reinforced geopolymer foam concrete with special focus on natural fibers reinforcement. Furthermore, some basic and background information of natural fibers and geopolymer foams are reported. In most of the research, foams are produced either through chemical foaming with hydrogen peroxide or aluminum powder, or through mechanical foaming which includes a foaming agent. However, previous reviews have not sufficiently addresses the fabrication of geopolymer foams by syntactic foams. Finally, recent efforts to reduce the fiber degradation in geopolymer concrete are discussed along with challenges for natural fiber reinforced-geopolymer foam concrete.

show abstract

Metakaolin

Cited by 38 publications

References 31 publications

Potential of Calcined Brick Clay as a Partial Substitution in Blended Cement Mortars

Potential of Calcined Brick Clay as a Partial Substitution in Blended Cement Mortars

Evaluation of the long-term compressive strength development of the sewage sludge ash/metakaolin-based geopolymer

Natural Fiber-Stabilized Geopolymer Foams—A Review

Contact Info

Product

Resources

About