Operations on Special Concretes
Learn the basics of concreting in extreme weather conditions and marine environments in this free online course.Publisher: NPTEL
CertificationView course modules
You have probably come across marine structures such as ship docking facilities, jetties or bridges that have their foundations deep in the ocean waters and you've possibly wondered how they were built or how the concrete was placed underwater despite the waves and tides. Furthermore, seawater is corrosive and would easily undermine these structures over time if they were made of ordinary concrete. So, how is concreting done in these circumstances and what type of concrete is used? You will learn all this and more in this free online course. First, the course will take you through the concreting process under normal or ordinary conditions and the concrete curing process, and then introduce you to special concretes used in special situations or circumstances. After that, you will explore concreting in cold weather and the effects of cold weather on the setting time of concrete as well as the techniques that can be used to accelerate the hydration of cement in cold weather conditions.
Next, you will learn about the definition of hot weather in the context of the concreting process and the effect of hot weather on fresh and hardened concrete. You will discover ways of working with hot weather concrete, supplementary cementitious materials, and curing methods unique to hot weather conditions. Furthermore, you will recognise the importance of using the correct techniques and specifications to prepare concrete. The methods used in sampling, testing, and interpretation of concrete test results will be presented. You will learn how this can be done while paying close attention to the various site challenges faced at every stage, from batching and mixing to transportation, placing, and compaction. The course will then introduce you to the methods used in testing the strength of shotcrete as well as the composition of ordinary portland cement, and the proportion of heat that each of the cement components gives out. Thereafter, you will explore the factors that affect temperature rise and heat removal or dissipation, followed by the procedures involved in working with mass concrete. Observe how to place, compact and deal with hydration heat in this process. After that, you will learn about the applications of underwater anti-washout concrete.
Lastly, you will be taken through the strength development process in anti-washout concrete. This concept will give way to the unveiling of the methods used for placing underwater concrete. You will study the unique skills of proportioning ingredients and mixing concrete for use in marine environments. The techniques used to protect the underwater concrete surface from flowing water and waves before hardening will be explained. Furthermore, you will uncover the special Roller-Compacted Concrete (RCC), its definition, history, and use. Discover the construction techniques used for the compaction of RCC, the selection of compaction rollers, and possible problems during roller-compacting. The knowledge accumulated from this course, primarily on special concretes for use under unusual circumstances, such as extreme weather conditions and marine environment, will be crucial in undertaking construction projects under those circumstances. Therefore, this course will benefit anyone considering a career in the building and construction industry, particularly in the use of special concretes. It is also highly recommended for practising civil engineers, structural engineers, contractors and building technicians who would like to enrich and refresh their knowledge and skill base. So why wait? Start the course now!
Concreting in Hot and Cold Weather
Learning Outcomes - Concreting in Hot and Cold Weather
Curing of Concrete
Cold Weather Concreting
Hot Weather Concreting
Importance of Right Methods and Specifications
Lesson Summary - Concreting in Hot and Cold Weather
Underwater and Roller-Compacted Concrete
Learning Outcomes - Underwater and Roller-Compacted Concrete
Heat of Hydration of Cement and Thermal Stresses
Anti-washout Underwater Concrete
Roller Compacted Concrete
Lesson Summary - Underwater and Roller-Compacted Concrete
By the end of this course, you will be able to:
- Describe the processes and conditions that make a concrete special.
- Distinguish the effects of hot weather on fresh and hardened concrete.
- Explain the factors to consider in the sampling and testing of concrete.
- State the methods used in concrete compaction.
- Outline the procedure for designing concrete mix for marine structures.
- Identify the methods of protecting fresh underwater concrete surfaces from flowing water and waves.
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