Preparation and Release Behavior of Microwave Active Controlled Release Capsule in Concrete
ZHANG Qi1, FENG Pan1,2,*, WANG Haochuan1, SHAO Lijing1, YE Shaoxiong1, RAN Qianping1,2
1 Jiangsu Key Laboratory of Construction Materials,School of Materials Science and Engineering, Southeast University, Nanjing 211189, China 2 State Key Laboratory of High Performance Civil Engineering Materials, Nanjing 210008, China
Abstract: Akind of concrete-based active controlled release capsule was designed and prepared. The capsule can release the core material actively under the stimulation of microwave signal. Capsule and its release behavior were characterized by scanning electron microscopy, X-ray computed tomography and potentiometric titration. The release mechanism and influencing factors of release ratio were discussed by fitting the release kinetics model and analyzing the range and variance. The results show that the average loading capacity of the capsule is 34.71%; the core material can be released slowly and continuously after the microwave is applied; the release mechanism is mainly Fick diffusion mechanism with core materials distributed in the pores of porous carrier; the influence degree of each influencing factor on the release ratio is microwave power > microwave treatment time>paraffin thickness>Fe3O4 content; it is preliminarily proved that the capsule has the property of microwave active control release in mortar. The application of the capsule is expected to solve the negative effects of direct admixtures and the difficulty in improving the properties of concrete after hardening.
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2022, Vol. 36 
