Abstract
Cement-based materials prepared with activated water induced by a magnetic field or electric field represent a possible solution to environmental issues caused by the worldwide utilization of chemical admixtures. In this contribution, electric- and magnetic-activated water have been produced. The workability and mechanical properties of cement mortar prepared with this activated water have been investigated. The results indicate that the pH and absorbance (Abs) values of the water varied as the electric and magnetic field changed, and their values increased significantly, exhibiting improved activity compared with that of the untreated water. In addition, activated water still retains activity within 30 min of the resting time. The fluidity of the cement paste prepared with electric-activated water was significantly larger than that of the untreated paste. However, the level of improvement differed with the worst performance resulting from cement paste prepared with alternating voltage activated water. In terms of mechanical properties, both compressive strength and flexural strength obtained its maximum values at 280 mT with two processing cycles. The compressive strength increased 26% as the curing time increased from 7 days to 28 days and flexural strength increased by 31%. In addition, through the introduction of magnetic-activated water into cement mortar, the mechanical strength can be maintained without losing its workability when the amount of cement is reduced.
Highlights
Concrete is a widely used material that is adaptable to many purposes, but the usefulness and versatility of concrete as a construction material are due in great deal to the many fields and laboratory investigations performed to analyze its performance over the past century [1,2,3,4,5]
The influence of the magnetic field intensity on the fluidity of cement paste prepared with activated water was complicated, with multiple extremum values being observed at 280 and 450 mT
The workability of cement paste prepared with activated water could be improved to varying degrees, and the improvement was more prominent for samples with longer curing times
Summary
Concrete is a widely used material that is adaptable to many purposes, but the usefulness and versatility of concrete as a construction material are due in great deal to the many fields and laboratory investigations performed to analyze its performance over the past century [1,2,3,4,5]. Many researchers have shown that applying magnetic-activated water to concrete mixing can improve the fluidity [14], accelerate the cement hydration reaction [15], increase the compressive strength [16,17], and reduce the corrosion rate of the steel rebars [18]. Magnetic-activated water can readily penetrate into the cement particles, resulting in a more complete hydration reaction and improving the mechanical performance of cement-based materials [32]. The engineering properties of self-compacting concrete incorporating magnetic water and pozzolanic materials have been evaluated [38,39], and the results indicated that adding magnetic water and pozzolanic materials into cement-based materials can improve the self-compatibility criteria in terms of flowability and viscosity. The workability and mechanical properties of cement-based materials prepared with this activated water were investigated
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