HKUST Institutional Repository
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Repository of Hong Kong University of Science and Technology. Managed by the HKUST Library.
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1.
Concrete durability enhancing admixture - Li, Zongjin; Chau, Chung Kong; Li, Faming; Ma, Baoguo
An admixture for enhancing the durability of concrete to repeated freeze-thaw cycles is disclosed. The admixture comprises as an essential element a natural polymer material derived from millet. The admixture further comprises smaller quantities of naphthenic sulfate salt, triethanolamine and formaldehyde. In addition the admixture can improve concrete's impermeability and chloride ion binding capability.
(759841 bytes; application/pdf) - 18-dic-2008
2.
Apparatus and method for resistivity measurement of a sample - Li, Zongjin (???); Li, Wenlai (???)
Traditional methods for resistivity measurements of concrete have to use two plate electrodes at opposite sides of a prism specimen. The major drawback of such a method is that the electrodes can be easily detached from the specimen due to shrinkage of concrete. Thus the measurement of resistivity is not accurate and sometimes easily has an unacceptable error. To get accurate measurement of resistivity of cement-based materials, a new device is invented. The new device utilizes a toroidal current principle. The concrete to be measured is case into a ring shape specimen and acts as the secondary of a transformer.
A...
(443843 bytes; application/pdf) - 18-dic-2008
3.
Contactless, transformer-based measurement of the resistivity of materials - Li, Zhongjin; Li, Wenlai
Traditional methods for resistivity measurements of concrete have to use two plate electrodes at opposite sides of a prism specimen. The major drawback of such a method is that the electrodes can be easily detached from the specimen due to shrinkage of concrete. Thus the measurement of resistivity is not accurate and sometimes easily has an unacceptable error. To get accurate measurement of resistivity of cement-based materials, a new device is invented. The new device utilizes a toroidal current principle. The concrete to be measured is case into a ring shape specimen and acts as the secondary of a transformer.
A...
(259185 bytes; application/pdf) - 18-dic-2008
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