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收集所有交通大學研究人員與學生個人或團體所發表之各項學術著作，涵蓋期刊論文、教師專書、學位論文等項。;;Collections of Publications of NCTU Researchers and Students Like Journal Papers and Thesis.

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Now showing 1 - 7 of 7
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    An NMR and XRD study of solidification/stabilization of chromium with portland cement and beta-C2S
    (1996-06-01)
    Lin, CK
    ;
    Chen, JN
    ;
    Lin, CC
    ;
    環境工程研究所
    ;
    材料科學與工程學系
    Solidificalion/stabilization of chromium with Portland cement Type I and P-dicalcium silicate (beta-C2S) was investigated by means of the Si-29 solid stale Magic Angle Spinning/Nuclear Magnetic Resonance (Si-29 MAS/NMR) and X-ray Diffraction (XRD) techniques. It is found that chromium nitrate can increase the extent of beta-C2S hydration. It is also confirmed that the chromium ion is easily incorporated into the beta-C2S paste and hydrated Portland cement, and that it affects the characteristics of hydration and hydration products. Formation of beta-calcium chromium oxide hydrate (beta-CaCrO4 . 2H2(O)) during the hydration of chromium-doped beta-C2S and calcium chromium oxide hydrate (CaCrO4 . 2H(2)O) during the hydration of chromium-doped Portland cement indicates the substitution of chromium for silicon in hydration products. The chromium ion, Cr3+, is thus stabilized and solidified through this mechanism.
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    Characteristics of microhydrates formed under steam conditions
    (2000-05-01)
    Lin, WM
    ;
    Hwang, CL
    ;
    Peng, YN
    ;
    土木工程學系
    ;
    Department of Civil Engineering
    This paper presents the physical properties and chemical composition of hydrates formed under steam conditions. The test specimens were made with cement as well as individual compounds. A comprehensive study on the characteristics of hardened hydrates in a microscopic scale was carried out. An improved polymerization of silicate anions resulting in an increased CaO/SiO2 ratio at an elevated temperature was verified by the nuclear magnetic resonance spectroscopy (NMR) analysis. Dense microstructures of hydrates and low content of Ca(OH)(2) crystals were observed by the scanning electron microscope (SEM), energy dispersive spectromer (EDS), environmental scanning electron microscope (ESEM), thermogravimetric analyzer (TGA), and x-ray diffractometer (XRD) tests. Mercury intrusion porosimetry (MIP) had been used to examine the pore structures of hydrates. It revealed that the hardened paste made with the dry-mixture/steam-injection (DMSI) method developed microstructures with low porosity, small pore radius, and larger surface areas. These observations agree with the NMR/TGA test results. This paper also discusses the effects of sample fineness and compaction on the hydrate's microstructures formed under steam environment. The test results verify the validity of the DMSI concept.
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    Reuse of fresh water sludge in cement making
    (2004)
    Pan, JR
    ;
    Huang, C
    ;
    Lin, S
    ;
    環境工程研究所
    ;
    Institute of Environmental Engineering
    With the increasing demand for high quality water, a large quantity of chemical agent must be added in the water purification process, which in turn generates enormous amount of fresh water sludge. Of all the options for sludge disposal, sludge reuse has been considered most economical and environmentally sound. This study evaluated the possibility of incorporating fresh water sludge in the making of Portland cement through the sintering process. The goal was to search for the optimal condition to maximize the replacement of clay with the fresh water sludge. Characteristics of fresh water sludge were collected and analyzed. The analysis showed that water source and water treatment process dominate the characteristics, particularly the chemical composition of the fresh water sludge. The fresh water sludge was mixed with the cement clay in various percentages, from 0% to 100%, as raw material for cement-making. The effects of its addition on the sintering condition and the quality of cement were evaluated. The analysis of the clinkers showed that the addition of the fresh water sludge did not change the phase form and the f-CaO content of the cement. The compressive strength of the masonry increased with the increasing addition of fresh water sludge. All cement products made from various replacement ratios met the Chinese National Standard of first degree Portland cement.
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    Item type:Item,
    Properties of soilcrete stabilized with jet grouting
    (2004)
    Fang, YS
    ;
    Kuo, LY
    ;
    Wang, DR
    ;
    土木工程學系
    ;
    Department of Civil Engineering
    In this paper. mechanical properties of jet-grouted soilcrete are investigated. Jet grouting (JSG) was conducted to improve ground properties for the construction of a cross-passage between a sewerage tunnel and a manhole of the Taipei Sewer Sub-main System. Soils treated were silty sand and sandy silt. Cylindrical specimens were drilled from the site and tested in the laboratory. Experimental results show that the elastic wave velocities, modulus of elasticity, and uniaxial compressive strength of soilerete increase with increasing dry density. Poisson's ratio of soilcrete varies from 0.05 to 0.29, which is very close to the ratio for concrete. Brazilian tensile strength of soilcrete varies from 1/7 to 1/28 of its uniaxial compressive strength. The cohesion of jet-grouted soilcrete varies from 0.40 to 4.22 MPa, and the internal friction angle varies from 20degrees to 44degrees. The design internal friction angle phi = 0degrees recommended by the JSG Association appears to be conservative.
  • Thumbnail Image
    Item type:Item,
    An NMR and XRD study of solidification/stabilization of chromium with portland cement and beta-C2S
    (1996-06-01)
    Lin, CK
    ;
    Chen, JN
    ;
    Lin, CC
    ;
    環境工程研究所
    ;
    材料科學與工程學系
    Solidificalion/stabilization of chromium with Portland cement Type I and P-dicalcium silicate (beta-C2S) was investigated by means of the Si-29 solid stale Magic Angle Spinning/Nuclear Magnetic Resonance (Si-29 MAS/NMR) and X-ray Diffraction (XRD) techniques. It is found that chromium nitrate can increase the extent of beta-C2S hydration. It is also confirmed that the chromium ion is easily incorporated into the beta-C2S paste and hydrated Portland cement, and that it affects the characteristics of hydration and hydration products. Formation of beta-calcium chromium oxide hydrate (beta-CaCrO4 . 2H2(O)) during the hydration of chromium-doped beta-C2S and calcium chromium oxide hydrate (CaCrO4 . 2H(2)O) during the hydration of chromium-doped Portland cement indicates the substitution of chromium for silicon in hydration products. The chromium ion, Cr3+, is thus stabilized and solidified through this mechanism.
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    Item type:Item,
    An NMR, XRD and EDS study of solidification/stabilization of chromium with portland cement and C3S
    (1997-09-01)
    Lin, CK
    ;
    Chen, JN
    ;
    Lin, CC
    ;
    環境工程研究所
    ;
    材料科學與工程學系
    Solidification/stabilization (S/S) of chromium with Portland cement type I and tricalcium silicate (C3S) was investigated by using the Si-29 solid state magic angle spinning/nuclear magnetic resonance (Si-29 MAS/NMR), X-ray diffraction (XRD) and energy dispersive spectroscopy (EDS). The present study confirms that chromium nitrate can increase the extent of C3S hydration. It also confirms that the chromium ion is easily incorporated into the C3S paste and hydrated Portland cement, and that it affects the characteristics of the hydration processes and their hydration products, The formation of calcium chromium silicate (CaCrSi4O10), calcium chromium oxide hydrate (CaCrO4 . 2H(2)O), and calcium dichromate (CaCr2O7) during the hydration of chromium-doped C3S indicates the probable substitution of chromium for silicon in the calcium silicate hydrate (C-S-H) and the interaction between Cr and Si. Furthermore, formation of CaCrSi4O10, aluminum chromium oxide hydroxide hydrate (Al(OH)CrO4 . H2O), aluminum chromium oxide hydroxide (Al-2(OH)(4)CrO4), and CaCr2O7 during the hydration of chromium-doped cement reveals not only the probable substitution of chromium for silicon in the calcium silicate hydrate (C-S-H) but also the interaction among Cr, Si and Al, Apparently, the chromium iron (Cr3+) may also be stabilized and solidified through these mechanisms in addition to those proposed by other investigators. (C) 1997 Elsevier Science B.V.
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    Fundamental study on hydration of cement and cement minerals with steam
    (1998-01-01)
    Lin, WM
    ;
    Lin, TD
    ;
    Hwang, CL
    ;
    Peng, YN
    ;
    土木工程學系
    This paper-discusses the basic concept of steam hydration and presents test data oil heat of hydration by exposing cement compounds to pressurized steam. The lest samples include cement and its individual compounds; tricalcium silicate (C3S), dicalcium silicate (C2S), tricalcium aluminate (C(3)A), and tetracalcium aluminoferrite (C(4)AF). For a compacted 10 grams C3S sample, the heat of hydration was determined as 209 cal/g. All samples except C;A hardened during steaming. Nonetheless, rite C(3)A samples reacted very rapidly with steam and registered a 91 C temperature rise during the test. This paper also discusses effects of sample's fineness and degree of compaction on heat evolution and hydrate morphology during exposure to steam. The test results verify the validity of the dry-mix/steam-injection (DMSI) concept.