EFFECTS OF USING SEAWATER IN THE MIXING AND CURING OF CONCRETE

2020 ◽  
Vol 7 (1) ◽  
Author(s):  
Hadeel Moussawel
Keyword(s):  
Blast Furnace Slag ◽  
Potable Water ◽  
Water Shortage ◽  
Partial Replacement ◽  
World Population ◽  
Concrete Technology ◽  
Structural Concrete ◽  
The World ◽  
Hardened Properties ◽  
Furnace Slag

The U.N. evaluates that in 2050 the world population will increase about three point five billion, mostly in evolving countries that have underwent potable water crises. Furthermore, over half of the world population will unable to provide sufficient amounts of drinking water. Consequently, it is absolutely crucial to study ways to save freshwater. The use of seawater, which accounts for 97 percent of all the water present on Earth, is very essential. This thesis studies the use of seawater instead of freshwater in the mixing and curing of structural concrete in order to reduce future water shortage and aid in the evolution of concrete technology. Concrete mixed and cured with seawater is studied in terms of fresh and hardened properties. Results include an expected early accelerated rate of gain in compressive strength and presumably no direct effect on the rate of corrosion of reinforcement when compared to concrete mixed and cured with freshwater. Also, the type of concrete’s effect was studied by using ordinary Portland cement (OPC) and by partial replacement of OPC with Blast-Furnace Slag Cement (BFSC).

scholarly journals Effect of Mineral Admixtures on the Performance of Low-Quality Recycled Aggregate Concrete

Crystals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 596
Author(s):  
Yasuhiro Dosho
Keyword(s):  
Blast Furnace ◽  
Fly Ash ◽  
Blast Furnace Slag ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Mineral Admixtures ◽  
Structural Concrete ◽  
Aggregate Concrete ◽  
Granulated Blast Furnace Slag ◽  
Furnace Slag

To improve the application of low-quality aggregates in structural concrete, this study investigated the effect of multi-purpose mineral admixtures, such as fly ash and ground granulated blast-furnace slag, on the performance of concrete. Accordingly, the primary performance of low-quality recycled aggregate concrete could be improved by varying the replacement ratio of the recycled aggregate and using appropriate mineral admixtures such as fly ash and ground granulated blast-furnace slag. The results show the potential for the use of low-quality aggregate in structural concrete.

scholarly journals Optimization of an Eco-Friendly Hydraulic Road Binders Comprising Clayey Dam Sediments and Ground Granulated Blast-Furnace Slag

Buildings ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 443
Author(s):  
Selma Bellara ◽  
Mustapha Hidjeb ◽  
Walid Maherzi ◽  
Salim Mezazigh ◽  
Ahmed Senouci
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Setting Time ◽  
Road Construction ◽  
Cement Clinker ◽  
Partial Replacement ◽  
Industry Waste ◽  
Impact Reduction ◽  
Compressive And Flexural Strengths ◽  
Furnace Slag

This study investigated the potential use of Zerdezas dam Calcined Sediments (CS) and El-Hadjar Blast Furnace Slag (GGBS) from northern Algeria as a partial replacement of cement (C) in normal hardening hydraulic road binders. Two binder mix designs were optimized using a Response Surface Methodology (RSM). The first mix, 50C35GGBS15CS, consisted of 50% cement, 35% blast furnace slag, and 15% calcined sediment. The second mix, 80C10GGBS10CS, consisted of 80% cement, 10% blast furnace slag, and 10% calcined sediments. The tests of workability, setting time, volume expansion, compressive and flexural strengths, porosity, and SEM were conducted to ensure that both mixes meet the standard requirements for road construction binders. The two proposed mixes were qualified as normal hardening hydraulic road binder. The reuse of the sediments will contribute to a better disposal of dam sediments and steel industry waste and to preserve natural resources that are used for manufacturing cement. It will also contribute to the environmental impact reduction of cement clinker production by reducing greenhouse gas emissions.

Water and Water Security

2018 ◽  
pp. 138-145
Author(s):  
Nadiye Gür
Keyword(s):  
Pollution Prevention ◽  
Water Security ◽  
Water Shortage ◽  
Future Generations ◽  
World Population ◽  
Prevention Measures ◽  
Water Safety ◽  
The World ◽  
Quality Grading ◽  
Human Health Effects

Today, there are many studies about the problems that may be faced in the context of World Water Day. In this chapter, the structure, pollution, quality grading, and human health effects of water; possible pollution prevention measures; and water safety are discussed. It is expected that the world population, which is about 7 billion currently, will rise to 9 billion by 2050. Water consumption is expected to increase at a higher rate, which is a major problem for the environment. By 2025, it has been estimated that two-thirds of the world's population will deal with water shortage. The world is not as rich in water as once thought and, hence, is at high risk for water shortage. For these reasons, we must all fulfill our responsibility to leave a habitable world to future generations.

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