Flexural Strength Recovery Induced by Vegetative Bacteria Added to Mortar

Williams, S.; Sakib, Nazmus; Kirisits, Mary Jo; Ferron, Raissa Douglas

doi:10.14359/51688831

Cited by 12 publications

(13 citation statements)

References 21 publications

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“…Based on previous studies, regained mechanical properties were applied to identify the self-sealing capacity and the self-healing capacity over a long time. A few scholars had employed the regained flexural strength as the indication of the self-repairing phenomenon [37]. Most of them had chosen the regained compressive strength test [26,38].…”

Section: Regained Compressive Strengthmentioning

confidence: 99%

The Self-Sealing Capacity of Environmentally Friendly, Highly Damped, Fibre-Reinforced Concrete

Huang

Kaewunruen

et al. 2020

Materials

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Cracks could attenuate the service life of concrete structures because of the intrusion of hazardous substances such as water. In this study, different proportions of Duras S500 fibre were employed to investigate the self-sealing capacity of environmentally friendly, highly damped, fibre-reinforced concrete (EFHDFRC) containing 5% crumb rubber. The workability of EFHDFRC with different proportions of the fibre was investigated by mechanical properties test. The self-sealing capacity was first measured by introducing the ultrasonic pulse velocity (UPV) test combined with the damage degree in a time-dependent manner. In addition, the regained compressive strength test and visual inspection were applied as additional measures of the self-sealing capacity. The experimental results show that EFHDFRC with different proportions of fibre showed the maximum sealing degree between the 42nd and 51st days after casting the concrete. EFHDFRC with 0.1% fibre had the best performance and the maximum self-sealing degree (2.82%). In summary, it has been proven that 0.1% fibre could stimulate the self-sealing capacity of EFHDFRC by bridging cracked concrete. Moreover, it is noted that sufficient space in cracks is essential for precipitation formation, which could seal the cracks. The new insights of this innovative self-healing, high-damping material are essential for industrial applications exposed to dynamic load conditions such as railway turnout bearers and sleepers, highspeed rail track slabs, blast-resistant walls and columns, and so on.

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Section: Regained Compressive Strengthmentioning

confidence: 99%

The Self-Sealing Capacity of Environmentally Friendly, Highly Damped, Fibre-Reinforced Concrete

Huang

Kaewunruen

et al. 2020

Materials

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“…It was proposed that achieving a crack closure by above 70–80% was necessary to drive the recovery of stiffness and load resistance of the host matrix with CA . For the microbial‐induced CaCO 3 precipitation, some findings noted that the addition of bacterial cells and nutrients was detrimental to the development of concrete strength.…”

Section: Regained Properties and Assessment Of Healing Efficiencymentioning

confidence: 99%

Recent Advances in Intrinsic Self‐Healing Cementitious Materials

et al. 2018

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Self-healing is a natural phenomenon whereby living organisms respond to damage. Recently, considerable research efforts have been invested in self-healing cementitious materials that are capable of restoring structural integrity and mechanical properties after being damaged. Inspired by nature, a variety of creative approaches are explored here based on the intrinsic or extrinsic healing mechanism. Research on new intrinsic self-healing cementitious materials with biomimetic features is on the forefront of material science, which provides a promising way to construct resilient and sustainable concrete infrastructures. Here, the current advances in the development of the intrinsic healing cementitious materials are described, and a new definition of intrinsic self-healing discussed. The methods to assess the efficiency of different healing mechanisms are briefly summarized. The critical insights are emphasized to guide the future research on the development of new self-healing cementitious materials.

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“…Di sisi lain, ada mikroba sejenis yang mampu mengendapkan senyawa kalsium karbonat (CaCO3) atau kalsit (mineral liat CaCO3). Masing-masing proses tersebut yang pertama disebut dengan istilah microbial induced calcite precipitation (MICP) (DeJong et al, 2009) sedang yang kedua disebut sebagai microbialinduced calcium carbonate precipitation (MICCP) (Williams et al, 2016). Proses yang sebenarnya sama ini mengacu pada pemanfaatan mikroba penghasil enzim urease (ureolytic bacteria) (Wei et al, 2015;Putra et al, 2016).…”

Section: Pendahuluanunclassified

“…Dalam bidang pertanian tanaman, proses ini disebut dengan istilah pemantaban agregat (Santi & Goenadi, 2013 (Williams et al, 2016), untuk membentuk stabilitas pasir. Hasilnya menunjukkan bahwa sementasi terjadi pada matrik pasir dengan pemusatan kalsit membentuk ikatan pada ujung pertemuan dua partikel.…”

Section: Jenis Mikroba Pembentuk Kalsitunclassified

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Perbaikan tanah melalui mediasi hayati [Bio-mediated soil improvement]

Goenadi¹

2017

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AbstrakSifat tanah yang tidak mampu memberikan dukungan fisika-mekanis yang diperlukan seringkali menjadi kendala dalam pemanfaatannya baik untuk pertanian maupun konstruksi. Cara-cara yang umum adalah dengan aplikasi bahan kimia yang tidak saja mahal, tetapi juga tidak ramah lingkungan. Oleh karena itu diperlukan teknologi baru, berkelanjutan, dan inovatif untuk memperbaiki sifat-sifat mekanis tanah. Beberapa penelitian telah memberikan peluang untuk memanfaatkan mikroba untuk tujuan ini, khususnya mikroba yang memiliki kemampuan untuk menghasilkan senyawa metabolit sekunder penguat struktur partikel tanah seperti enzim urease. Bakteri penghasil enzim ini mampu mendorong pembentukan mineral kalsit yang berfungsi sebagai perekat antar partikel tanah. Bagaimanapun juga, aplikasi teknologi ini secara langsung di lapangan menghadapi beberapa kendala, seperti interaksi tanah dan cairan ruang pori, bioaugmentasi vs biostimulan dari komunitas mikroba, penyebaran terkendali dari pengendapan kalsit yang dimediasi, dan sementasi permanen. Tulisan ini menyajikan secara singkat pengembangan teknologi perbaikan sifat fisik mekanis tanah melalui aplikasi mikroba untuk memenuhi persyaratan pekerjaan konstruksi.[Kata kunci : sifat fisika tanah, sifat mekanis, mikroba ureolitik, cairan ruang pori, pengendapan kalsit] PendahuluanKebutuhan infrastruktur sipil untuk pertanian dan non-pertanian membuka peluang untuk teknologi yang berkelanjutan yang memenuhi persyaratan sosial dengan pembiayaan yang efisien dan berdampak negatif rendah. Pengendalian dan modifikasi sifat-sifat tanah sangat penting untuk aplikasi geoteknik, geolingkungan, pertanian, dan yang lainnya. Praktek yang umum digunakan di bidang konstruksi adalah dengan menyuntikkan bahan sintetik ke dalam lapisan bawah permukaan melalui teknik pengisian celah dengan aliran bahan kimia untuk mengikat partikel tanah dan *) Penulis

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Flexural Strength Recovery Induced by Vegetative Bacteria Added to Mortar

Cited by 12 publications

References 21 publications

The Self-Sealing Capacity of Environmentally Friendly, Highly Damped, Fibre-Reinforced Concrete

The Self-Sealing Capacity of Environmentally Friendly, Highly Damped, Fibre-Reinforced Concrete

Recent Advances in Intrinsic Self‐Healing Cementitious Materials

Perbaikan tanah melalui mediasi hayati [Bio-mediated soil improvement]

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