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Volume 1993 (1993)
- Issue 247 Pages 411-
- Issue 246 Pages 272-
- Issue 245 Pages 201-
- Issue 244 Pages 135-
- Issue 243 Pages 69-
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Volume 1993, Issue 247
Displaying 1-10 of 10 articles from this issue
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Effect of Surface Treatment of the FillersFumio ISO, Takeru SHIMADA, Osamu MACHINAGA, Zenjiro OSAWA1993 Volume 1993 Issue 247 Pages 411-419
Published: November 01, 1993
Released on J-STAGE: March 07, 2011
JOURNAL FREE ACCESSThe effect of the surface treatment of finely pulverized dolomite fillers on the physical properties of PP and PVC composites was studied, and the following results were obtained.
The tensile strength of the composites mixed with the dolomite was higher than that of the composites mixed with calcium carbonate (Fig. 2). The breaking tensile elongation of the sample No.2 was remarkably high among PP/dolomite series, and it was improved by the surface treatment (Fig.3 and 4). The izod impact strength of the sample No.2 among the PP/dolomite series was also improved by the surface treatment with every surface treating agent (Fig.5 and 6). The deflection temperature under the load in the dolomite and calcium carbonate serirs was higher than that of the pure resins, but no effect of the surface treatment was observed (Table 3). The fluidity of the dolomite and calcium carbonate serirs was lower than that of the pure resins, but it was improved by the surface treatment of the fillers (Fig.7, 8, 9 and 10). Although the dispersibility of the PP/dolomite series (untreated; No.2) and PVC/dolomite series (untreated; No.2) was good, further improvement was observed by the surface treatment (Fig.11). The results obtained indicated that the finely pulverized dolomite is useful as a filler for organo-polymeric composites.View full abstractDownload PDF (1504K) -
Yoshinori FUJIKI, Takayoshi SASAKI, Mamoru WATANABE, Toshiyuki NISHIO1993 Volume 1993 Issue 247 Pages 420-426
Published: November 01, 1993
Released on J-STAGE: March 07, 2011
JOURNAL FREE ACCESS(Ba-and Sr-doped fibrous K2 Ti4O9 crystals which have a layered structure were grown from a flux melt of K2 MoO4. The crystals were treated in a dilute acid solution to change chemical composition by extracting K+ in the interlayers, and then were heat-treated to change crystal structure. Consequently, fibrous crystals of (K, Ba) 2Ti6O13 and (K, Sr) 2Ti6O13 which have a tunnel structure were synthesized by a compositional-structural change process using fibrous (K, Ba or Sr) 2 Ti4 O9 crystals as a starting material.View full abstractDownload PDF (1331K) -
Hideki MONMA1993 Volume 1993 Issue 247 Pages 427-433
Published: November 01, 1993
Released on J-STAGE: March 07, 2011
JOURNAL FREE ACCESSCalcium-deficient apatite (DAp) was electrolytically deposited on a stainless steel substrate from acidic calcium phosphate solutions containing NaNO3+NaF or KNO3+KF at 80°C, exceptionally 90°C. Different morphologies and orientations of DAp crystals deposited on the substrate were observed depending on electrolytic conditions. DAp crystals deposited under appropriate conditions were elongated to the [001] direction and surrounded by the {100} planes of the apatite structure. DAp crystals had calcium-deficiencies near Ca/P=1.50 and a composition like (Ca>>Na, K) 10-x (HPO4) x (PO4) 6-x (F, H2O) 2.View full abstractDownload PDF (2920K) -
Kouju SUGIYAMA, Takashi SUZUKI, Naokazu SAKOTA1993 Volume 1993 Issue 247 Pages 434-441
Published: November 01, 1993
Released on J-STAGE: March 07, 2011
JOURNAL FREE ACCESSAlminium substituted tobermorite which is one of cation-exchangers of layered calcium silicate type was synthesized hydrothermally from CaO, SiO2, Al (NO3) 3 and NaOH under saturated steam pressure at 175°C. The cation exchange characteristics of the tobermorite to silver (I) ion has been investigated in aqueous solution at 25°C. It was found that at the silver initial conceritration below 10.0mM, silver ions were exchanged for the interlayer calcium ion of the tobermorite, but at beyond 16.0mM silver ions were exchanged for both calcium ions in the inter-and intra-calcium ions, resulting in the destraction of the structure of tobermorite. Tobermorites with different silver contents were prepared and tested on their antibacterial activities for Eschericia coli, Staphylococcus aureus, and Streptoverticillium reculum. All the tobermorites tested exhibited effective antibacterial activities.View full abstractDownload PDF (1481K) -
Koichi SOEDA, Makoto MATSUHISA, Hiroshi HAYASHI, Kazuyoshi TSUCHIYA1993 Volume 1993 Issue 247 Pages 442-449
Published: November 01, 1993
Released on J-STAGE: March 07, 2011
JOURNAL FREE ACCESSThe expansive stress of non-explosive demolition agent depends strongly on curing temperature, and the generation of expansive stress extremely delayed at low temperature. So the agent used at low temperature should be prepared to have high hydration velocity. In producing process of the agent for low temperature, the chemical composition strongly affects the hydration properties of the agent. So, in this paper the influence of chemical composition on the properties of the agent for low temperature was examined. The results are as follows.
1) The hydration velocity and generation of expansive stress became larger with higher HM. But blown-out shot was apt to occur.
2) The hydration velocity and generation of expansive stress became smaller with higher SM. But expansive stress developed afterward.
3) The hydration velocity and generation of expansive stress was extremely delayed at initial stage with lower IM. But the development of expansive stress afterward became larger and danger of blown-out shot decreased.
4) The hydration velocity and generation of expansive stress became smaller, as dosage of CaSO4 was larger.
5) The optimum chemical composition of the agent for low temperature was assumed to have about 17 HM, 3-4SM, 1-1.5IM and 1-1.5% of CaSO4 dosage.View full abstractDownload PDF (753K) -
Naomitsu TSUYUKI, Naohito OGASAWARA, Junichi KASAI, Yoshitoki IIJIMA1993 Volume 1993 Issue 247 Pages 450-456
Published: November 01, 1993
Released on J-STAGE: March 07, 2011
JOURNAL FREE ACCESSGlass with the gehlenite composition (glassy gehlenite for short) is known as a main phase of granulated blastfurnace slag, and also as a noncrystalline part of aluminous cement. The activation effects, of Ca (OH) 2 on the hydration of synthesized glassy gehlenite was investigated and compared with NaOH..A mixture of CaCO3, Al2O3 and SiO2 in the mole ratio of C2AS was melted in a radio-frequency electric furnace at 1700°C, and then quenched into water immediately. The hydration of glassy gehlenite was initiated by an activating agent such as NaOH or Ca (OH) 2. The concentration of various ions in the solution was measured as a function of time by using ICP, and ion chromatography. When glassy gehlenite was dispersed into suspension of Ca (OH) 2, the remarkable elution stage of Al (OH) 4- was observed in the hydration process, subsequently, C2ASH8 and C-S-H (I) were formed.
The binding energy of each atoms on the particle surface of unhydrated glass was obtained by ESCA. Hence, half width of spectrum of Si 2p orbital differed crystal and glassy gehlenite. It was recognized that the hydration of glassy gehlenite were depended by structure of particle surface.View full abstractDownload PDF (794K) -
Hiroaki ISOZAKI1993 Volume 1993 Issue 247 Pages 457-459
Published: November 01, 1993
Released on J-STAGE: March 07, 2011
JOURNAL FREE ACCESSDownload PDF (606K) -
Masayoshi FUJI, Masatoshi CHIKAZAWA1993 Volume 1993 Issue 247 Pages 460-470
Published: November 01, 1993
Released on J-STAGE: March 07, 2011
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Tamotsu YASUE, Yoshiyuki KOJIMA, Yasuo ARAI1993 Volume 1993 Issue 247 Pages 471-480
Published: November 01, 1993
Released on J-STAGE: March 07, 2011
JOURNAL FREE ACCESSDownload PDF (2218K) -
Yoshio ISHIZAWA1993 Volume 1993 Issue 247 Pages 481-489
Published: November 01, 1993
Released on J-STAGE: March 07, 2011
JOURNAL FREE ACCESSDownload PDF (1420K)
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