A study on the application of vacuum microwave composite dewatering technnique in concrete engineering

✍ Scribed by Li Dongxu; Wu Xuequan

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 299 KB
• Volume: 24
• Category: Article
• ISSN: 0008-8846
• DOI: 10.1016/0008-8846(94)90097-3

✦ Synopsis

In this paper, the application of a vacuum microwave composite dewatering technique in concrete engineering is studied. The final w/c ratio of concrete is decreased to about 0.38. The plastic contraction of concrete occuring due to the decrease of the free water and the hydration rate of cement is increased during the microwave curing process. As a result, the concrete is densified, and the compressive strength as well as the fiexural strength of concrete are increased at all ages. Meanwhile, the total porosity, especially the volume of large pores, and the electric conductivity of concrete are decreased.

Although the investment in the cost of microwave equipment must be considered, the cost could be compensated as the improvement of the properties of concrete or the reduction of the amount of cement used.