The Experimental Study on the Strength Improvement of Concrete Introducing the Different Electrolyzed Waters

L. Wang1, K. Uji1, H. Morozumi2, and M. Uemura3

1. Department of Civil and Environmental Engineering, Tokyo Metropolitan University, Tokyo, Japan

2. Department of Electrolyzed Water Sales, AMANO Maintenance Engineering Co., Ltd, Tokyo, Japan

3. Representative Director, UEXX Co., Ltd, Tokyo, Japan

Abstract: Nowadays the electrolyzed water has been widely used in industrial and ecological cleaning, food hygiene as well as drinking water industry, but it has not been considered as a method in concrete technology to improve the strength and durability of concrete. In this study, four kinds of different electrolyzed water were used in concrete and the influences on the strength of concrete have also been investigated, including the cathode water (2 types), anode water and slightly alkaline ionized water. The results showed that the strength of cathode electrolyzed water concrete increased by 22% at 14d, increased by 12.6% at 91d in comparison to natural water concrete. The strength of slightly alkaline ionized water concrete increased by 9.7% at 91d. However, the strength of anode water concrete decreased by 6.4% at 91d. In addition, when the pH and ORP (Oxidation-Reduction Potential) value of electrolyzed water were in a certain range, the compressive strength of electrolyzed water concrete increased with pH value, but decreased with ORP value overall. An adequate pH value of electrolyzed water should be controlled below 10 that could avoid the damage to the human body and the property of concrete, and an adequate ORP value should be controlled around 200.The results of TG/DTA test for mortar showed the Ca(OH)2 amount in cathode electrolyzed water mortar was obviously higher than that in natural water mortar at each age. The generation of more C-S-H gels and reduction of the porosity may be the main reasons for the strength improvement of electrolyzed water concrete. Effective utilization of electrolyzed water in concrete would reduce the cost for cement production and concrete construction, this has good economic benefits and environmental benefits.

Key words: compressive strength, Ca(OH)2 amount, electrolyzed water, pH value, ORP value