scholarly journals Sustainable Corrosion Inhibitors for Concrete

2021 ◽  
pp. 130-146
Author(s):  
B. Chugh
Keyword(s):  
Green Chemistry ◽  
High Performance ◽  
Corrosion Inhibitors ◽  
High Performance Concrete ◽  
Cost Effective ◽  
Protective Measures ◽  
Concrete Corrosion ◽  
Recent Advances ◽  
Corrosion Mechanisms ◽  
Green Corrosion Inhibitors

Green chemistry and sustainability encourages the significance of preserving the nature and individual’s wellbeing in cost effective way that intends to avoid toxicity and reduction of wastes. Therefore, the implication of green corrosion inhibitors in the field of concrete protection has also received immense attention these days. Indeed, the usage of such inhibitors is a well-known strategy for producing high performance concrete. In view of this, the present chapter discusses the research in the area of sustainable corrosion inhibitors for concrete assurance used commercially in various industries. It also highlights the concrete corrosion mechanisms and its protective measures, recent advances in this field.

Developing Deeper Understanding of Green Inhibitors for Corrosion of Reinforcing Steel in Concrete

2015 ◽  
pp. 118-146 ◽  
Author(s):  
Mohammad Ismail ◽  
Pandian Bothi Raja ◽  
Abdulrahman Asipita Salawu
Keyword(s):  
Corrosion Inhibitors ◽  
Engineering Students ◽  
Inorganic Compounds ◽  
Environmentally Benign ◽  
Reinforcing Steel ◽  
Protection Measures ◽  
Green Inhibitors ◽  
Concrete Corrosion ◽  
Chloride Attack ◽  
Green Corrosion Inhibitors

Corrosion of reinforcing steel in concrete is a very serious and significant problem in the construction industry. The primary cause of corrosion of reinforcing steel is chloride attack or carbonation. Among several protection measures for concrete corrosion, the usage of corrosion inhibitors is very attractive from the view of cost and ease of application. Though there are numerous organic and inorganic compounds that have been tested and applied industrially as corrosion inhibitors, restrictive environmental regulations have compelled and motivated researchers towards the development of cheap, non-toxic and environmentally benign natural or green corrosion inhibitors. Recent studies on green inhibitors have shown that they are more effective and highly environmentally benign compared to synthetic inhibitors used in the industries. This chapter contributes to developing awareness, understanding and innovative involvement of materials and engineering students in this area that is vital to reduce expenditure related to corrosion problems when they serve in the industries.

Optimization of Structural Design for High-Performance Concrete Bridges

1998 ◽  
Vol 1624 (1) ◽  
pp. 132-139
Author(s):  
Mary Lou Ralls ◽  
Ramon L. Carrasquillo ◽  
Ned H. Burns
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
High Strength ◽  
Cost Effective ◽  
Concrete Bridges ◽  
Practical Guidelines ◽  
Improved Performance ◽  
Maintenance Requirements ◽  
Design And Construction

High-performance concrete (HPC) bridges can be cost-effective both initially and in the long term, provided the design and construction optimize the improved performance characteristics of HPC. Using the high-strength characteristic of HPC can reduce the required number and size of beams. Using the improved durability characteristics of HPC can reduce maintenance requirements and extend the service life. Practical guidelines help design and construction engineers implement HPC in bridges.

scholarly journals Rheological Properties Of Self-Consolidating Concrete Incorporating Natural And Industrial Pozzolans

2021 ◽  
Author(s):  
Asaad Mousa
Keyword(s):  
Rheological Properties ◽  
Yield Stress ◽  
Silica Fume ◽  
High Performance ◽  
High Performance Concrete ◽  
Cost Effective ◽  
Sustainable Construction ◽  
Self Consolidating Concrete ◽  
Supplementary Cementing Materials ◽  
Passing Ability

Self-consolidation concrete (SCC) is the latest version of high performance concrete with excellent workability and high resistance to segregation and bleeding. The main objective of this project is to study the rheological properties of SCC incorporating natural and industrial pozzolans (silica fume and metakaolin, repectively) as supplementary cementing materials (SCMs). Use of such pozzolanic materials in the development of environmentally friendly and cost effective SCC can lead to sustainable construction. In this project eleven SCC mixtures are developed by incorporating different percentages of silica fume (SF) and metakaolin (MK) as replacement of cement. However, the water cement ratio of all SCC mixtures are optimized so that all mixtures satisfied the requirements of SCC in terms of fresh properties such as workability, stability, passing ability, bleeding and segregation resistance. This study particularly concentrates on evaluation of the rheological properties such as viscosity and yield stress of developed silica fume and metakaolin based SCC mixtures. The influence of SF and MK dosages on viscosity and yield stress of SCC mixtures are evaluated. Correlations among fresh and rheological properties are developed and critically reviewed to make recommendations.

scholarly journals Assessment of the Durability Dynamics of High-Performance Concrete Blended with a Fibrous Rice Husk Ash

Crystals ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 75
Author(s):  
David O. Nduka ◽  
Babatunde J. Olawuyi ◽  
Olabosipo I. Fagbenle ◽  
Belén G. Fonteboa
Keyword(s):  
Rice Husk ◽  
High Performance ◽  
Rice Husk Ash ◽  
High Performance Concrete ◽  
Cost Effective ◽  
Attenuated Total Reflection ◽  
Partial Replacement ◽  
X Ray ◽  
Durability Properties ◽  
Chemical Attack

The present study examines the durability properties of Class 1 (50–75 MPa) high-performance concrete (HPC) blended with rice husk ash (RHA) as a partial replacement of CEM II B-L, 42.5 N. Six HPC mixes were prepared with RHA and used as 5%, 10%, 15%, 20%, 25%, and 30% of CEM II alone and properties are compared with control mix having only CEM II. The binders (CEM II and RHA) were investigated for particle size distribution (PSD), specific surface area (SSA), oxide compositions, mineralogical phases, morphology, and functional groups using advanced techniques of laser PSD, Brunauer–Emmett–Teller (BET), X-ray fluorescence (XRF), X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier transform infrared/attenuated total reflection (FTIR/ATR), respectively, to understand their import on HPC. Durability properties, including water absorption, sorptivity, and chemical attack of the HPC samples, were investigated to realise the effect of RHA on the HPC matrix. The findings revealed that the durability properties of RHA-based HPCs exhibited an acceptable range of values consistent with relevant standards. The findings established that self-produced RHA would be beneficial as a cement replacement in HPC. As the RHA is a cost-effective agro-waste, a scalable product of RHA would be a resource for sustainable technology.

scholarly journals Cost-Effective High-Performance Concrete: Experimental Analysis on Shrinkage

Materials ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 2730
Author(s):  
Barbara Kucharczyková ◽  
Dalibor Kocáb ◽  
Petr Daněk ◽  
Ivailo Terzijski
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Setting Time ◽  
Mechanical Strain ◽  
Cost Effective ◽  
Strain Gauges ◽  
Early Age ◽  
Dry Air ◽  
First Case

This paper focuses on the experimental determination of the shrinkage process in Self-Compacting High-Performance Concrete (SCC HPC) exposed to dry air and autogenous conditions. Special molds with dimensions of 100 mm × 60 mm × 1000 mm and 50 mm × 50 mm × 300 mm equipped with one movable head are used for the measurement. The main aim of this study is to compare the shrinkage curves of SCC HPC, which were obtained by using different measurement devices and for specimens of different sizes. In addition, two different times t0 are considered for the data evaluation to investigate the influence of this factor on the absolute value of shrinkage. In the first case, t0 is the time of the start of measurement, in the second case, t0 is the setting time. The early-shrinkage (48 h) is continuously measured using inductive sensors leant against the movable head and with strain gauges embedded inside the test specimen. To monitor the long term shrinkage, the specimens are equipped with special markers, embedded into the specimens’ upper surface or ends. These markers serve as measurement bases for the measurement using mechanical strain gauges. The test specimens are demolded after 48 h and the long term shrinkage is monitored using the embedded strain gauges (inside the specimens) and mechanical strain gauges that are placed, in regular intervals, onto the markers embedded into the specimens’ surface or ends. The results show that both types of measurement equipment give a similar result in the case of early age measurement, especially for the specimens cured under autogenous conditions. However, the early age and especially long term measurement are influenced by the position of the measurement sensors, particularly in the case of specimens cured under dry air conditions. It was proven that the time t0 have a fundamental influence on the final values of the shrinkage of investigated SCC HPC and have a significant impact on the conclusions on the size effect.

Recent advances in the design of a high performance metal–nitrogen–carbon catalyst for the oxygen reduction reaction

2021 ◽  
Author(s):  
Cheng-Wei Ye ◽  
Lan Xu
Keyword(s):  
Fuel Cells ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
High Performance ◽  
Cost Effective ◽  
Reduction Reaction ◽  
Practical Significance ◽  
Carbon Catalyst ◽  
Highly Active ◽  
Recent Advances

Developing highly active, stable, and cost-effective cathode oxygen reduction reaction (ORR) catalysts is of great practical significance to promote the widespread applicability of fuel cells (FCs).

Future Research Trends in High-Performance Concrete: Cost-Effective Considerations

1997 ◽  
Vol 1574 (1) ◽  
pp. 49-55 ◽  
Author(s):  
Chao-Lung Hwang ◽  
Long-Sherng Lee
Keyword(s):  
Cycle Length ◽  
High Performance ◽  
High Performance Concrete ◽  
Construction Material ◽  
Cost Effective ◽  
Research Trends ◽  
Future Research ◽  
Ongoing Research ◽  
Ordinary Concrete ◽  
High Rise

High-performance concrete (HPC) prepared on the basis of eugenic considerations (cost-effectiveness and life-cycle length) is proposed to resolve actual concrete problems. HPC is safe, durable, workable, economical, and ecologically sound. Concrete in Taiwan is always designed with large amounts of water and paste (even though it is generally accepted that the concrete will tend to crack and deteriorate). Therefore, HPC with fewer problems is the target of ongoing research. Eugenic HPC is produced from ordinary concrete, superplasticized concrete, pozzolanic concrete, and high-flowing concrete. Without the drawbacks of past forms of concrete, eugenic HPC is a better construction material on the basis of individual material characteristics. The characteristics of eugenic HPC are presented and illustrated by two high-rise buildings in Taiwan constructed with high-flowing HPC.

scholarly journals Sustainability Levels in Comparison with Mechanical Properties and Durability of Pumice High-Performance Concrete

2021 ◽  
Vol 11 (11) ◽  
pp. 4964
Author(s):  
Kristýna Hrabová ◽  
Petr Lehner ◽  
Pratanu Ghosh ◽  
Petr Konečný ◽  
Břetislav Teplý
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Cost Effective ◽  
Cementitious Materials ◽  
Sustainability Indicators ◽  
Supplementary Cementitious Materials ◽  
Evaluation Procedure ◽  
Sustainable Performance ◽  
Diffusion Parameters ◽  
Bridge Deck Slabs

In the production of cement and concrete, mechanical and durable properties are essential, along with reasonable cost and sustainability. This study aimed to apply an evaluation procedure of the level of sustainability of mixtures of high-performance concretes (HPC) with various eco-friendly supplementary cementitious materials (SCM). The major supplementary cementitious materials (SCMs), namely, volcanic pumice pozzolan (VPP), Class C and F fly ash, ground granulated blast furnace slag of grade 120, silica fume, and metakaolin, were included. Twenty-seven concrete mixtures were analyzed using a previously presented comprehensive material sustainability indicator in a cost-effective variant. The results indicated that the rank of the concretes differed at 28, 56, and 91 days after concreting. In addition, the study showed no correlation of strength and diffusion parameters with sustainability indicators. Finally, this study will contribute to the optimal selection of mixtures of HPC with VPP in terms of sustainability, cost, and durability for future implementation in reinforced concrete bridge deck slabs and pavements. The values of sustainability indicators for pumice-based mixtures were compared with those for other SCMs, highlighting the sustainable performance of volcanic ash-based SCM.

scholarly journals “Testing of High-Performance Concrete using Recycled Aggregates”

2021 ◽  
Vol 9 (9) ◽  
pp. 495-498
Author(s):  
Ms. Sakshi Harish Gaidhane
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Human Life ◽  
Concrete Strength ◽  
Cost Effective ◽  
Recycled Aggregates ◽  
Literature Study ◽  
The World ◽  
Natural Aggregates ◽  
Local Store

Abstract: Tons of waste is produced in the world on every day basis which sometimes gets really hard to manage and. The waste from demolished structures is one of them. Recycling waste consume energy and produces pollution that can lead to many adverse effects on the environment and human life. The disposal of waste is also very dangerous for the environment. Using waste materials like waste aggregates, broken bricks, stones and other material in concrete can help in eliminating the waste and save the environment getting polluted. It is also very much economical and encourages green concrete industry. The literature study consists of testing of high-performance concrete using waste aggregates by replacing 100 % natural aggregates. Also, silica fume and plasticizer are used as admixture to obtain more effective results. The tests were carried out on 3, 7 and 21 days of curing. The results were tallied using graphs between comparison of compressive strength and tensile strength of natural and recycled aggregates. The cement and natural aggregates and sand was obtained from a local store in a nearby market. The recycled aggregates were obtained from a nearby demolished building. The quantities were taken in a proper proportion according to IS codes to avoid any defects while constructing the cubes and while curing and performing various tests. Keywords: Recycled Aggregates, Natural Aggregates,Concrete Strength, High Performance Concrete, Properties of Concrete, Cost Effective

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