Effects of Micro- and Ultrafine Metakaolin on Compressive Strength and Water Sorptivity of High Volume Fly Ash Concrete

Supit, Steve W.M.; Makalew, Febriane Paulina

doi:10.1007/978-3-030-32816-0_27

Cited by 6 publications

(4 citation statements)

References 12 publications

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“…Compressive strength is a fundamental property of concrete, making it the most common mechanical property investigated in almost every study of HVFA mixtures. Given the same w/cm and curing regime, a reduction in the compressive strength at various curing ages (mainly ranging from 1 d to 365 d) is generally reported when replacing cement with HVFA [36][37][38][39][40][41][42][43][44]. e level of strength reduction increases with increasing fly ash content and decreases with increasing curing age.…”

Section: Compressive Strengthmentioning

confidence: 95%

High‐Volume Fly Ash‐Based Cementitious Composites as Sustainable Materials: An Overview of Recent Advances

Zhao

Shi

2021

Advances in Civil Engineering

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High-volume fly ash (HVFA) cementitious composites (paste, grout, mortar, and concrete) have been widely investigated as a class of sustainable materials due to their lower carbon footprint and often better life cycle performance than conventional Portland cement mixtures. Recent years have seen increased research in HVFA-based materials, and the potential of this type of mixtures in engineering applications has significantly improved. In this context, this work reviews the renewed knowledge of HVFA mixtures, focusing on the relevant papers published over the last decade. The effects of replacing cement with a HVFA binder on the fresh properties, mechanical properties, durability performance, and environmental impact of HVFA cementitious composites are explored. Measures that can compensate for the main drawbacks that limit the wider application of HVFA mixtures are discussed in detail. At last, we summarize the research needs and remaining challenges of HVFA cementitious composites.

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Section: Compressive Strengthmentioning

confidence: 95%

High‐Volume Fly Ash‐Based Cementitious Composites as Sustainable Materials: An Overview of Recent Advances

Zhao

Shi

2021

Advances in Civil Engineering

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“…Jalur pejalan kaki anak sebagai salah satu fasilitas infrastruktur bagi anak memberikan prioritas kegiatan anak saat berjalan kaki termasuk berlari dan bermain (Makalew et al, 2017;Makalew et al, 2018;Makalew et al, 2019;Makalew et al, 2021). Produk paving berpori dikembangkan dengan mempertimbangkan keamanan, kenyamanan dan tekstur serta warna yang menarik bagi anak ; (Supit & Makalew, 2019). Shelter pejalan kaki merupakan area perhentian sementara pengguna jalan dan komuter transport umum.…”

Section: Hasil Dan Pembahasanunclassified

Penerapan Produk Shelter Pejalan Kaki Anak Di SLB Kreasi Mandiri

Makalew

Supit

2022

JAI

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Pengembangan hasil penelitian berkaitan dengan shelter pejalan kaki anak diimplementasikan dalam bentuk penerapan produk pada lokasi mitra Sekolah Luar Biasa (SLB) Kreasi Mandiri. Material yang dikembangkan untuk pembuatan shelter adalah material komposit dan kayu kelapa. Area sekolah yang digunakan siswa dan anak-anak pengunjung sekolah memerlukan tempat berteduh di luar ruangan yang aman, nyaman dan mengutamakan aktifitas anak. Kawasan sekolah SLB Kreasi Mandiri di desa Winangun Atas, belum memiliki shelter pejalan kaki anak yang memadai. Tujuan kegiatan ini adalah untuk menjelaskan tahapan penerapan produk shelter pejalan kaki dan menjelaskan perubahan yang terjadi akibat implementasi hasil penelitian pada sekolah SLB Kreasi Mandiri sebagai lokasi pengabdian. Metode yang digunakan adalah pembuatan shelter berdasarkan hasil penelitian disain dan konstruksi shelter. Pembuatan produk shelter dilakukan dengan penyediaan bahan sesuai panduan disain dan dikerjakan oleh pekerja ahli, tim pelaksana Politeknik Negeri Manado. Hasil yang diperoleh adalah tersedianya shelter pejalan kaki. Pembuatan shelter ini terdiri dari tahap pekerjaan persiapan, pembangunan konstruksi shelter, pekerjaan pengecatan dan pengaturan area sekitar shelter. Shelter dimanfaatkan oleh penghuni sekolah dan pengunjungnya sebagai fasilitas kegiatan luar ruang bagi siswa dan guru sekolah. Penerapan hasil penelitian menjadi terlaksana dan dimanfaatkan secara langsung oleh mitra pengabdian. Kelanjutan penerapan hasil penelitian menjadi evaluasi penggunaan shelter untuk ditingkatkan kualitasnya. Kegiatan Penerapan Usaha Produk Inovasi Vokasi (PUPIV) ini menjadi dasar bagi pihak sekolah dalam melanjutkan program pengembangan lingkungan sekolah dan produk ramah lingkungan lainnya. Penerapan hasil penelitian bagi masyarakat berupa shelter menjadi optimal dengan keterlibatan pihak pelaksana dan mitra. Penggunaan shelter memberikan hasil evaluasi penggunaan fasilitas secara optimal.

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“…Such blends are composed of at least two pozzolanic materials. Fly ash is one of them (it is the main component of the blend) and more active fine-grained pozzolanic material (e.g., silica fume [ 17 , 26 , 27 ], nano-silica [ 17 , 28 , 29 , 30 , 31 ], metakaolin [ 27 , 32 ]) is the other. In such a composition, very active pozzolana can react in the early hydration period, during which fly ash is almost inactive.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, fine grains of the active pozzolana can accelerate hydration of cement (nucleation effect). In this way, the start of setting can occur faster, and early compressive strength may be higher compared to fly ash–cement mixtures without additional pozzolanic components [ 17 , 26 , 27 , 29 , 30 , 32 ]. Fly ash shows activity and contributes to the development of strength and tightness in later periods.…”

Section: Introductionmentioning

confidence: 99%

Hydration Processes of Four-Component Binders Containing a Low Amount of Cement

2022

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Results of research on hydration of four-component binders containing very high amounts of supplementary cementitious materials were presented. The samples were composed of blended pozzolana (a mix of conventional fly ash and spent aluminosilicate catalyst), cement (about 20 wt.% in the binder) and Ca(OH)2. Spent aluminosilicate catalyst was proposed as activating component which can improve properties of low-cement blends, while the role of Ca(OH)2 was to enhance pozzolanic reaction. Early and later hydration periods of such blends were investigated by calorimetry, TG/DTG, FTIR and X-ray diffraction. Initial setting time as well as compressive strength were also determined. It was concluded that enhancement of reactivity and improvement of properties of fly ash–cement binders are possible by replacing a part of fly ash with more active fine-grained pozzolana and introducing additional amounts of Ca(OH)2. The spent catalyst is mainly responsible for accelerating action during the first hours of hydration and for progress of early pozzolanic reaction. Fly ash develops its activity over time, thus synergic effect influences the later properties of composites. Samples containing blended pozzolana exhibit shorter initial setting times and higher compressive strength, as well as faster consumption of Ca(OH)2 compared to the reference. Investigated mixtures seem to be promising as “green” binders, alternatives to cement, after optimizing their compositions or additional activating procedure.

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Effects of Micro- and Ultrafine Metakaolin on Compressive Strength and Water Sorptivity of High Volume Fly Ash Concrete

Cited by 6 publications

References 12 publications

High‐Volume Fly Ash‐Based Cementitious Composites as Sustainable Materials: An Overview of Recent Advances

High‐Volume Fly Ash‐Based Cementitious Composites as Sustainable Materials: An Overview of Recent Advances

Penerapan Produk Shelter Pejalan Kaki Anak Di SLB Kreasi Mandiri

Hydration Processes of Four-Component Binders Containing a Low Amount of Cement

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