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Lampang, Thailand

Mulinta S.,Lampang Rajabhat University
Key Engineering Materials | Year: 2014

The objective of this study is to investigate the effect of red clay, grog and cement content (5,10,15,20%) on unfired clay brick's properties. The comparative properties of construction bricks produced by the community fulfilled the requirements of Thai industrial standard (TIS 77-2545) for brick processing in Small and Micro Community Enterprise of Clay Brick Making Group in Son Bun Reung village. The physical and mechanical properties were tested consisting of the volume shrinkage, bulk density, appearance porosity, moisture expansion, slaking, compressive and fractural strength. The result showed that physical-mechanical properties were improved by the addition of cement. The unfired clay brick consisting of 100% grog and 20% cement had 4.5% shrinkage value. The bulk density and appearance porosity were 1.77 g/cm2 and 3.5%, respectively. The fractural strength of unfired clay bricks was 41.2 kg/cm2. The compressive strength of unfired clay bricks was 282.4 kg/cm2. The clay bricks were not slaking. © (2014) Trans Tech Publications, Switzerland. Source

Ruammaitree K.,Lampang Rajabhat University
Key Engineering Materials | Year: 2014

The inspiration of the work was polka dot. It was a regulation of nature can be seen in shape and structure of living and non-living things. The ceramic products were decorated by used slip color before being left to dry at room temperature. The ceramic products were fired at 1230 °C in oxidation atmosphere. The ceramic products were appearance of slip dots that was slightly raised above surface gave ceramics are wonderful and interesting texture. © (2014) Trans Tech Publications, Switzerland. Source

Phoo-ngernkham T.,Khon Kaen University | Chindaprasirt P.,Khon Kaen University | Sata V.,Khon Kaen University | Hanjitsuwan S.,Lampang Rajabhat University | Hatanaka S.,Mie University
Materials and Design | Year: 2014

This article presents the effect of adding nano-SiO2 and nano-Al2O3 on the properties of high calcium fly ash geopolymer pastes. Nano-particles were added to fly ash at the dosages of 0%, 1%, 2%, and 3% by weight. The sodium hydroxide concentration of 10 molars, sodium silicate to sodium hydroxide weight ratio of 2.0, the alkaline liquid/binder ratio of 0.60 and curing at ambient temperature of 23°C were used in all mixtures. The results showed that the use of nano-SiO2 as additive to fly ash results in the decrease of the setting time, while the addition of nano-Al2O3 results in only a slight reduction in setting time. Adding 1-2% nano-particles could improve compressive strength, flexural strength, and elastic modulus of pastes due to the formation of additional calcium silicate hydrate (CSH) or calcium aluminosilicate hydrate (CASH) and sodium aluminosilicate hydrate (NASH) or geopolymer gel in geopolymer matrix. In addition, the additions of both nano-SiO2 and nano-Al2O3 enhances the shear bond strength between concrete substrate and geopolymer. © 2013 Elsevier Ltd. Source

Banjerdpongchai R.,Chiang Mai University | Wudtiwai B.,Chiang Mai University | Pompimon W.,Lampang Rajabhat University
Asian Pacific Journal of Cancer Prevention | Year: 2014

Stigmalactam, an aristolactam-type alkaloid extracted from Orophea enterocarpa, exerts cytotoxicity against several human and murine cancer cell lines, but the molecular mechanisms remain elusive. The aims of this study were to identify the mode and mechanisms of human cancer cell death induced by stigmalactam employing human hepatocellular carcinoma HepG2 and human invasive breast cancer MDA-MB-231 cells as models, compared to normal murine fibroblasts. It was found that stigmalactam was toxic to HepG2 and MDA-MB-231 cells with IC50 levels of 23.0±2.67 μM and 33.2±4.54 μM, respectively, using MTT assays. At the same time the IC50 level towards murine normal fibroblast NIH3T3 cells was 24.4±6.75 μM. Reactive oxygen species (ROS) production was reduced in stigmalactam-treated cells dose dependently after 4 h of incubation, indicating antioxidant activity, measured by using 2',7',-dichlorohydrofluorescein diacetate and flow cytometry. Caspase-3 and caspase-9 activities were increased in a dose response manner, while stigmalactam decreased the mitochondrial transmembrane potential dose-dependently in HepG2 cells, using 3,3'-dihexyloxacarbocyanine iodide and flow cytometry, indicating mitochondrial pathway-mediated apoptosis. In conclusion, stigmalactam from O. enterocarpa was toxic to both HepG2 and MDA-MB-231 cells and induced human cancer HepG2 cells to undergo apoptosis via the intrinsic (mitochondrial) pathway. Source

Mulinta S.,Lampang Rajabhat University
Key Engineering Materials | Year: 2016

The purpose of the study was to investigate the effects of dolomite body, frit and potassium feldspar on the properties of color slip for decorative method of color slip on earthen ware production. The chemical composition of raw material was analyzed by X-ray fluorescence(XRF). The experiment started with triaxial blend of dolomite body, frit and potassium feldspar in the defined ratio and then to painting of color slips on specimen. After that, firing specimens at 950 °C in oxidation atmosphere. Finally, the specimens were tested microstructure and physical properties. The results showed that the ratio of 50% dolomite body, 40% frit and 10% potassium feldspar were optimum properties for decorative on earthenware body. In color slip consisting of blue color added cobalt oxide 1 wt%, green colors added chromic oxide 10 wt%, gray color added manganese oxide 10 wt%, yellow color added stain 2225 10 wt% and hazel color added ferric oxide 2 wt%. © 2016 Trans Tech Publications, Switzerland. Source

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