Mechanical properties of cement concrete composites containing nano-metakaolin

Supit, Steve W.M.; Rumbayan, Rilya; Ticoalu, Adriana

doi:10.1063/1.5011540

Cited by 10 publications

(11 citation statements)

References 8 publications

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“…Rather, it is caused by the negative impact of CCs on the workability of concrete ( 17 ), and this cannot be fully counteracted by the use of superplasticizers (SP), as the required SP dosage may exceed the recommended limit by the SP manufacturer and such a high dosage may severely affect the setting and strength development of concrete ( 18 ). Past research has shown that the use of CC can improve the mechanical properties (i.e., the compressive, tensile, and flexural strength) and durability of concrete ( 8 , 12 , 16 – 20 ). Some studies reported that CC is quite effective in enhancing the early- and later-age strength of concrete ( 7 , 8 , 15 , 17 ).…”

Section: Summary Of the Existing Knowledgementioning

confidence: 99%

Performance of Impure Calcined Clay as a Pozzolan in Concrete

Jafari

Rajabipour

2020

Transportation Research Record

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Supplementary cementitious materials (SCMs) are natural or industrial by-product materials which are used to improve the performance, durability, and sustainability of concrete mixtures. Motivated by the recent reports on shortage of conventional SCMs, impure calcined clays (CCs) are receiving attention as abundant alternative pozzolans for concrete. In this study, a clay slurry resulting from washing aggregates in a commercial sand and gravel pit was investigated. This source clay was dried and calcined, and the properties and pozzolanic performance of the resulting CC was evaluated. It was observed that despite having a large (>50%wt.) inert quartz content, the CC met all ASTM C618-19 (AASHTO M295) requirements for natural pozzolan. A pavement-grade concrete mixture containing 20%CC as a cement replacement (by weight) produced desired workability and fresh and hardened air content. Strength development was slightly below the control. The use of CC improved the durability of concrete with respect to chloride penetration, alkali–silica reaction, and drying shrinkage in comparison with a control (100% Portland cement) mixture. In addition, ternary limestone-calcined clay–cement and slag-calcined clay–cement mortar mixtures showed excellent strength development while replacing nearly 50% of the Portland cement.

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Section: Summary Of the Existing Knowledgementioning

confidence: 99%

Performance of Impure Calcined Clay as a Pozzolan in Concrete

Jafari

Rajabipour

2020

Transportation Research Record

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“…One of the most common environmental impact abatement techniques in concrete industry is the replacement of cement and natural aggregates with mineral materials reclaimed from industrial waste [4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Crushed Glass and Metakaolin Waste in the Properties of Modified Concrete

Nagrockienė¹

2022

Ceramics - Silikaty

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This paper examines the possibility of using waste crushed glass as a substitute for sand, and waste from the production of foaming agent -metakaolin as a substitute for cement in the production of modified concrete. Concrete mixes were formulated with different amounts of metakaolin (M) replacing cement at 5 %, 10 %, 15 % and 20 % and 25 % crushed glass (TS) replacing sand. From the results of the research, it can be said that crushed glass waste and metakaolin waste can be used in the production of modified concrete, while reducing the amount of cement and sand. The optimal amounts of waste to replace part of cement and sand is 10 % of metakaolin waste and 25 % of crushed glass waste, with which concrete mix increase density, ultrasonic pulse velocity (UPV), compressive strength, frost resistance cycles, absorption decreases. Thus, using metakaolin waste 10 % (replacing Portland cement) and 25 % crushed glass waste (replacing sand) in concrete mixes results in more durability concrete can be used in building structures.

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“…They accelerate calcium hydroxide consumption and promote an additional calcium silicate hydrate condensed gel that makes the microstructure denser, which effectively decreases the permeability [13]. The addition of 10% ultrafine-metakaolin in concrete improved the 7 th day tensile and flexural strength by 21% and 15%, respectively [14]. The studies mentioned previously have provided important information that was used as the basic knowledge for this experimental study where the effect of ultrafinemetakaolin was considered.…”

Section: Introductionmentioning

confidence: 99%

Performance of Cement Mortar Containing Micro and Ultrafine Metakaolin Binders

Supit¹,

Rumbayan²,

Ticoalu³

2022

International Journal on Advanced Science, Engineering and Information Technology

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Research into the usage of locally available construction material is essential and beneficial in ensuring a cost-effective construction project. One of the natural resources that be used as supplementary cementitious material is metakaolin. This research aims to investigate the performance of mortar reinforced with micro-and ultrafine metakaolin based on compressive strength and water absorption tests. Locally sourced metakaolin was mixed in cement mortar after calcined at 800C with a variation amount of 0%, 5%, and 10% by wt. The tests were conducted on the 50mmx50mmx50mm cube specimens after water curing at 7 and 28 days, following the ASTM-standards. Results show that specimens containing 10% of micro-and ultrafine-metakaolin (MK-10 and UM-10) exhibited the highest compressive strength and better water-resistance characteristics when compared to control mortar. In this case, the addition of 10% ultrafine metakaolin (UM-10) reached the highest compressive strength value with approximately 121% and 100% higher than the compressive strength of control mortar on the 7 th and 28 th day, respectively. Additionally, the water absorption of UM-10 at 28 days was found to be 86% and 30% lower than PCC and MK-10, respectively. Furthermore, X-Ray Diffraction (XRD) and Thermogravimetric graphs of pastes with micro-and ultrafine-metakaolin indicate a reduction of CH; therefore, the production of more CSH gel. The densification of cement paste with ultrafine-metakaolin is also confirmed by nitrogen adsorption analysis indicating ultrafine-metakaolin's inert filler effect in forming a denser matrix.

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Mechanical properties of cement concrete composites containing nano-metakaolin

Cited by 10 publications

References 8 publications

Performance of Impure Calcined Clay as a Pozzolan in Concrete

Performance of Impure Calcined Clay as a Pozzolan in Concrete

The Effect of Crushed Glass and Metakaolin Waste in the Properties of Modified Concrete

Performance of Cement Mortar Containing Micro and Ultrafine Metakaolin Binders

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