Performance and Properties of Concrete with Magnetic Water
Abstract:
When subjected to a magnetic field, the hydrogen bonds between water molecules become weakened, and the water molecule clusters break down into smaller ones. This allows for the water to more easily penetrate into cement particles, causing a faster and more effective hydration process. In order to assess the effect of magnetic water on curing and workability of cement past and wet concrete, also the compressive strength of condensed cement as well as concrete, first, a magnetic treatment device was designed and built in this study. The magnetic water produced was mixed with cement to make cement pastes with different water-to-cement (w/c) ratios. Curing time, workability, and compressive strength of such cement pastes were investigated. Then, using well balanced aggregates, magnetic water, cement with different proportions, and micro-silica, concrete with different mix designs were made and tested. Among the results from this study are: 1) The optimized magnetic field intensity for producing magnetic water is 0.8 to 1.0 tesla. 2) Magnetic water reduces the primary and secondary curing of cement by 50% and 19%, respectively. 3) The best compressive strengths are obtained if the water is circulated through the magnetic field for about 15 minutes, and the best workability is obtained if this time is about 65 minutes. 4) For higher proportions of cement in mix design and the application of magnetic water, the resulted concrete compressive strength may be increased by 20% and even higher. 5) In addition to enhancing the level of cement hydration, application of magnetic water takes more advantage of micro-silica in improving concrete strength. For example, the simultaneous application of micro-silica and magnetic water increases the 7-day-strength by 46% and the 28-day-strength by 39%. It is noteworthy that if one were to choose either application of micro-silica or the magnetic water for enhancing the concrete compressive strength, results here show that the application of micro-silica is slightly more effective. In general, the application of magnetic water increases the speed of concrete strengthening and/or the hydration process. In fact the rate of this strengthening for the 7-day-concrete is much more than that for the 28-day-concrete.
Language:
Persian
Published:
Concrete Research Quarterly Journal, Volume:8 Issue: 1, 2015
Pages:
85 to 99
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