Abstract
To realize high-efficiency CO2 absorption by fresh cement paste, ultrasonic vibration technology is introduced into the CO2 absorption test device used in this study. Influences of ultrasonic frequency on the CO2 absorption rate (CO2 AR) and the ultimate absorption amount of fresh cement paste are analyzed. Furthermore, the influencing laws of the CO2 absorption amount (CO2 AA) on the fluidity, pore distribution, and mechanical properties of cement paste under ultrasonic vibrating agitation are analyzed by measuring the variations of the CO2 AA of cement paste. Results demonstrate that ultrasonic vibrating agitation not only can increase the CO2 AR and ultimate absorption amount of fresh cement paste, but also can optimize the internal pore structure of materials and compressive strength of cement-based materials.
Highlights
The greenhouse effect which is caused by excessive CO2 emissions has brought many hazards
Reasonable settings of the stirring rate, water-cement ratio and addition order of water reducing agents alone cannot meet the fast CO2 absorption rate required in practical concrete production [11,12]
Two CO2 absorption devices were manufactured to discuss the influences of ultrasonic agitation on the CO2 absorption rate (CO2 AR) and the ultimate absorption amount of fresh cement paste
Summary
The greenhouse effect which is caused by excessive CO2 emissions has brought many hazards. Many methods exist to decrease global CO2 emissions, such as changing the energy structure, chemical absorption, and blocked curing [1] All of these methods have some technological defects. Reasonable settings of the stirring rate, water-cement ratio and addition order of water reducing agents alone cannot meet the fast CO2 absorption rate required in practical concrete production [11,12]. The variation laws of the internal microstructure after CO2 absorption of fresh cement paste for different amounts are observed [15,16,17] On this basis, the variation mechanism of basic performances of cement-based materials as a response to ultrasonic vibration is disclosed and the influences of cement flocculates on the crystal size of solution under ultrasonic waves were are analysed thoroughly [18,19,20]
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