Thermodynamic parameter analysis of water vapor adsorption process of fly ash concrete material
Source abstract
Abstract
Experimental research on water vapor adsorption performance of concrete with different class Ⅱ fly ash contents is carried out in this paper. Time-varying response curves of water vapor adsorption of fly ash concrete in five different humidity environments were obtained. According to the empirical formula of the thermodynamic parameters of water vapor adsorption of cement-based materials, the thermodynamic parameters of the water vapor adsorption process of fly ash concrete materials are calculated. The calculation method of the thermal kinetic parameters of water vapor adsorption for fly ash concrete materials is proposed; Influence of different fly ash contents with 10%, 20% and 30% mass percentage of cement and water-cement ratio on the water vapor adsorption characteristics of concrete materials is analyzed; The error between the second-layer adsorption energy and the condensation enthalpy of water vapor is calculated, and the rationality of the approximate calculation is analyzed. It is noted that (1) Water vapor adsorption characteristics of concrete materials are related to the water-cement ratio. With the water-cement ratio decreases, the adsorption capacity of concrete material increases. (2) Reasonable formula for calculating the number of saturated adsorption layers n of water vapor suitable for concrete materials is recommended. (3) Taking the condensation enthalpy of water vapor as the adsorption enthalpy of the second layer and subsequent layers reasonable to determine the dynamic parameters of the water vapor adsorption process of concrete.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Concrete and Cement Materials Research · Concrete Properties and Behavior · Advanced ceramic materials synthesis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (25)
Show source-provided references
1. Adsorption of gases in multimolecular layers10.1021/ja01269a023 ↗
2. A model of physical adsorption of gases10.1002/app.1979.070240609 ↗
3. Modifications of the Brunauer, emmett and teller equation10.1021/ja01208a049 ↗
4. Pore structure analysis by water vapor adsorption: I. T-Curves for water vapor10.1016/0021-9797(69)90132-5 ↗
5. Adsorption on nonporous solids10.1016/0021-9797(69)90423-8 ↗
6. Physical adsorption of gases at high pressure. Iv. An improvement of the dubinin—astakhov adsorption equation10.1016/0021-9797(76)90149-1 ↗
7. The study of pore structure analsis by water vapor adsorption-calculaiton of adsorption thickness and pore size distribution
8. Adsorption of nitrogen and water vapor by sliding zone soils of huangtupo landslide
9. Pore structure of hydrated calcium silicates. iv. analysis of a synthetic tobermorite10.1016/0021-9797(73)90292-0 ↗
10. Moisture diffusion in cementitious materials adsorption isotherms10.1016/1065-7355(94)90033-7 ↗
11. The surface area of hardened cement paste as measured by various techniques
12. A model for the microstructure of calcium silicate hydrate in cement paste10.1016/S0008-8846(99)00209-4 ↗
13. Influence of silica fume on the pore structure of mortar when measured by water vapour sorption isotherms
14. Dynamic determination of sorption isotherm of cement based materials10.1016/j.cemconres.2005.01.002 ↗
15. Prestudy on diffusion and transient condensation of water vapor in cement mortar10.1016/S0008-8846(02)00736-6 ↗
16. Xinrong · 2009
17. A model for sorption hysteresis in hardened cement paste10.1016/j.cemconres.2019.05.005 ↗
18. Relationship of moisture content with temperature and relative humidity in concrete10.1680/macr.12.00190 ↗
19. Discussion: relationship of moisture content with temperature and relative humidity in concrete10.1680/macr.13.00211 ↗
20. Experimental investigation of the effect of temperature on the first desorption isotherm of concrete10.1016/j.cemconres.2009.06.019 ↗
21. Effect of fly ash fineness on microstructure of blended cement paste10.1016/j.conbuildmat.2005.12.024 ↗
22. The pore structure of cement paste blended with fly ash10.1016/j.conbuildmat.2013.04.012 ↗
23. Water vapour sorption experiments on hardened cementitious materials10.1016/j.cemconres.2006.11.019 ↗
24. The determination of pore size distribution from gas adsorption data10.1021/ja01184a034 ↗
25. Adsorption of vapors by crystalline solid surfaces10.1021/i560105a005 ↗