Performance of nano metaclay on chloride diffusion for ultra- high performance concrete

Jaafar, Mohd Faizal Md; Saman, Hamidah Mohd; Sidek, Muhd Norhasri Muhd; Muthusamy, Khairunisa; Ismail, Noorli

doi:10.1088/1755-1315/682/1/012002

Cited by 3 publications

(3 citation statements)

References 23 publications

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“…This is to ensure that problem such as low workability do not arise, which could result in poor performance of UHPC and NM-UHPC at later age. This finding has been reported in the previous work done by [22].…”

Section: Methodology Materials and MIX Proportionsupporting

confidence: 91%

“…Table 1 shows the details of each concrete mix design. Mix constituent for UHPC was finalized based on trial mixes and adopted from previous work [21,22]. The water to cement ratio for UHPC was fixed at 0.20.…”

Section: Methodology Materials and MIX Proportionmentioning

confidence: 99%

“…On the other hand, nano clay after underwent the calcined process become reactive pozzolanic material due to highest production of SiO2 and Al2O3. The chemical and morphology examination on nano metaclay have been examined in previous studies [22]. This is the opportunity in this study to investigate the chloride transport properties in UHPC containing nano metaclay.…”

Section: Introductionmentioning

confidence: 99%

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Application of Response Surface Methodology for Chloride Transport Properties in Nano Metaclayed-UHPC

et al. 2021

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The major concern on the deterioration of reinforced concrete structure is due to the corrosion of steel reinforcement from the aggressive environment such as chloride penetration. Ultra-high performance concrete (UHPC) is an advanced concrete material having ultra-high strength with excellent durability properties. Inclusion of nano metaclay in UHPC is expected to overcome the chloride transport properties in UHPC by providing nano filler effect. Two (2) assessments were conducted which are chloride content and chloride depth were examined. All the concrete specimens were immersed in 3% NaCl solution up to 365 days and the tests conducted were performed at 3, 7, 28, 56, 91, 182 and 365 days. Response surface method (RSM) was performed to evaluate the interaction and relationship between operating variables (compressive strength and nano metaclay content). Based on RSM analysis, inclusion of nano metaclay in UHPC have good relationship towards the chloride resistance characteristics and adequate durability performance in terms of chloride penetration resistance. The results exhibited that inclusion of 1% nano metaclay significantly and positively affect in term of chloride penetration resistance.

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Section: Methodology Materials and MIX Proportionsupporting

confidence: 91%

Section: Methodology Materials and MIX Proportionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Application of Response Surface Methodology for Chloride Transport Properties in Nano Metaclayed-UHPC

et al. 2021

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Residual mechanical properties of concrete incorporated with nano supplementary cementitious materials exposed to elevated temperature

Tiwary,

Singh,

Eldin

et al. 2023

Nanotechnology Reviews

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The construction industry commonly employs concrete as a construction material, which sometimes may be subjected to fire exposure. It is important to adopt fire safety measures while planning and constructing such structures to ensure the safety of the occupants and the structural integrity of the concrete. So, determining its performance at elevated temperatures is of utmost importance. The main objective of this study was to investigate the impact of mineral incorporations, namely, nano bentonite clay (NBC) and nano fly ash (NFA), on the retained properties of concrete at normal (27°C) and at elevated temperatures. The feasibility of partly substituting ordinary Portland cement utilizing a mixture of NBC (0–5%) and NFA (0–50%) in concrete was assessed under the exposure to an elevated temperature ranging from 200 to 600°C. Several parameters were examined, including compressive strength, flexural strength, split tensile capacity, water penetration, loss of mass, ultrasound pulse velocity, and microstructure properties. After the experimental analysis, it was observed that the fire endurance was shown to be improved with the inclusion of nanoparticles (BC and FA). A reduction in the loss of mass by samples subjected to elevated heat was observed with the addition of nano bentonite and NFA. The mechanical strength results were obtained as maximum for the concrete specimens with 2% NBC and 20% NFA and further, the specimens performed better when exposed to elevated temperature as compared with normal concrete specimens. The microstructure of the concrete also upgraded with better impermeability owing to the use of NBC and NFA.

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OC, HPC, UHPC and UHPFRC Corrosion Performance in the Marine Environment

Lliso-Ferrando,

Gandía-Romero,

Soto

et al. 2023

Buildings

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This work aims to study the corrosion performance of six concretes in the marine environment: three ordinary concretes (C30, C40 and C50); one high-performance concrete (C90); two ultra high-performance concretes, one without fibres (C150-NF) and another one with steel fibres (C150-F). To this end, porosity and chloride ingress resistance were analysed at different ages. Resistivity was also evaluated and the corrosion rate in the embedded rebars was monitored. The results showed that C30, C40 and C50 had porosity accessible to water percentages and capillary absorption values between six- and eight-fold higher than C90 and C150-NF and C150-F, respectively. Similar differences were obtained when oxygen permeability was analysed. Chloride ingress resistance in the ordinary concretes was estimated to be one-fold lower than in C90 and two-fold lower than in C150-NF and C150-F. Presence of fibres in C150-F increased the diffusion coefficient between 5% and 50% compared to C150-NF. Fibres also affected resistivity: C150-NF had values above 5500 Ωm, but the C150-F and C90 values were between 700 and 1000 Ωm and were one-fold higher than the ordinary concretes. After 3 years, the corrosion damage in the embedded rebars exposed to a marine environment was negligible in C90, C150-NF and C150-F (9.5, 6.2 and 3.5 mg mass loss), but with higher values (between 170.4 and 328.9 mg) for C3, C40 and C50. The results allow a framework to be established to make comparisons in future studies.

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Performance of nano metaclay on chloride diffusion for ultra- high performance concrete

Cited by 3 publications

References 23 publications

Application of Response Surface Methodology for Chloride Transport Properties in Nano Metaclayed-UHPC

Application of Response Surface Methodology for Chloride Transport Properties in Nano Metaclayed-UHPC

Residual mechanical properties of concrete incorporated with nano supplementary cementitious materials exposed to elevated temperature

OC, HPC, UHPC and UHPFRC Corrosion Performance in the Marine Environment

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