| 1. |
- He, Zhen, et al.
(författare)
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The investigation of early hydration and pore structure for limestone powder wastes blended cement pastes
- 2019
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Ingår i: Construction and Building Materials. - : Elsevier BV. - 0950-0618. ; 229
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Tidskriftsartikel (refereegranskat)abstract
- This work systematically investigates the early hydration process and pore structure evolution of high limestone powder wastes content blended cement pastes by non-contact impedance measurement and microstructural tests. According to the evolution of impedance response, the early hydration process of blende cement pastes can be divided into four stages, denominated as dissolution, acceleration, dynamic balance and hardened stages, respectively. Dynamic balance stage not present in hydration process of pure cement, is a characteristic hydration stage for blended cement pastes. Furthermore, fractal approach for predicting the evolution of pore structure is proposed originally, based on the impedance results.
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| 2. |
- Tang, Shengwen, et al.
(författare)
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Continuous monitoring for leaching of calcium sulfoaluminate cement pastes incorporated with ZnCl 2 under the attacks of chloride and sulfate
- 2019
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Ingår i: Chemosphere. - : Elsevier BV. - 0045-6535 .- 1879-1298. ; 223, s. 91-98
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Tidskriftsartikel (refereegranskat)abstract
- Ionic zinc is considered as an environmental pollutant. This work systematically investigated leaching mechanisms of calcium sulfoaluminate cement (CSA) pastes incorporated with/without ZnCl 2 under the attacks of chloride and/or sulfate. The leaching behaviors of CSA pastes in the leaching solution are in-situ and continuously monitored by innovative non-contact electrical impedance measurement (NCEIM) and pH meter. The dissolution and diffusion during the leaching process are experimentally identified. Other techniques are also performed to verify the finding of NCEIM: the ion chromatograph and inductively coupled plasma optical emission spectrometer reveal the leaching or decomposition sequence of CSA pastes during the leaching process. Besides, results from XRD and SEM techniques demonstrate that main solid products in CSA pastes are ettringite and calcium monosulfoaluminate hydrates. The incorporation of Zn in the pastes has great impact on the decomposition of CSA pastes in the temperature elevation. External chloride and/or sulfate attacks significantly alter the pore structure of CSA pastes during the leaching process.
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| 3. |
- Tang, Shengwen, et al.
(författare)
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Current and future hydropower development in Southeast Asia countries (Malaysia, Indonesia, Thailand and Myanmar)
- 2019
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Ingår i: Energy Policy. - : Elsevier BV. - 0301-4215. ; 129, s. 239-249
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Tidskriftsartikel (refereegranskat)abstract
- This work discusses the development of hydropower in four Southeast Asia countries. With rapid economic development and insufficient energy supply, hydropower, as an important clean energy, plays a bigger role than before. It is shown that hydropower has immense potential and is the best choice to cater for the energy demand in Southeast Asia. In this work, Malaysia, Indonesia, Thailand and Myanmar are selected to analyze their hydropower development. This work introduces the status of hydropower resources, the current situation of hydropower development and the main distribution of hydropower stations in the four countries. In addition, the paper also introduces some energy policies, the development advantages and obstacles of the four countries, and puts forward suggestions for the future hydropower development of these four countries.
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| 4. |
- Tang, Shengwen, et al.
(författare)
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Modeling on the hydration and leaching of eco-friendly magnesium oxychloride cement paste at the micro-scale
- 2019
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Ingår i: Construction and Building Materials. - : Elsevier BV. - 0950-0618. ; 204, s. 684-690
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Tidskriftsartikel (refereegranskat)abstract
- Magnesium oxychloride cement (MOC) has been considered as a kind of eco-friendly cement in view of its significantly low calcination temperature and large capacity of carbon dioxide sequestration, compared with ordinary Portland cement (OPC). In this work, a computer model is established to simulate the hydration and leaching of MOC paste at the micro-scale. The composition of MOC paste in the ultimate hydration is investigated based on the thermodynamic method, and pore structure obtained from the computer simulation is compared with the one from experiments and literature, respectively. The simulated leaching results show that the original solid phase skeleton of MOC paste decomposes into magnesium hydroxide crystals. It is demonstrated that the simulation results are in good agreement with experimental data from literature and the proposed simulation can provide an effective method to reveal the hydration and leaching mechanism of MOC paste.
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| 5. |
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| 6. |
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| 7. |
- Wang, Lei, et al.
(författare)
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Sustainable High-Performance Hydraulic Concrete
- 2022
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Ingår i: Sustainability. - : MDPI AG. - 2071-1050. ; 14:2
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Concrete has always been indispensable as a material for the engineering and construction of hydraulic structures (e [...]
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