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    Effects of Shrinkage Reducing Agent and Expansive Additive on Plastic Shrinkage of Mortar at Different Temperatures
    (2018-09-19)
    Treesuwan, Sarapon
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    Date, Shigeyuki
    In the construction, it is inevitable to perform plaster work in hot weather which causes the dehydration and rapid shrinkage on the paste during the early age. This research shows the studies of reducing the plastic shrinkage of mortar during the early age with such additives as the Shrinkage Reducing Agent (SRA), the Expansive Additive (EX), and the Fly Ash (FA) in controlled temperatures at 30°C and 40°C, with relative humidity between 60% and 70% according to the ASTM C1579-06 standard, with the strain gauge installed at 0.5 cm.from the surface. The shrinkage rate was measured starting from the Initial Setting Time and every 10 minutes afterwards for 24 hours. The results show that high temperature effects the cracking and how to use different formulas of additive under different circumstances is considerably important. To use only one additive is not sufficient in high temperature. To use the SRA in addition to the EX enhances better expansion than to use only the EX. Moreover, it is recommended to pay close attention in adding large amount of the FA into mortar with the EX and SRA added which extremely enhances the expansion and potential cracking.
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    Effects of Shrinkage Reducing Agent and Expansive Additive on Mortar Properties
    (2017-01-01)
    Treesuwan, Sarapon
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    This research is to study the effect of mortar mixed with shrinkage reducing agent (polyoxyalkylene alkyl ether type), expansive additive (CaO type), and fly ash (hereinafter "SRA," "EX," and "FA," resp.). Moreover, steam curing was studied to improve the properties of mortar. The plastic shrinkage test was conducted by using the strain gauge embedded at 0.5 cm from the surface according to the ASTM C1579-06 standard within early age followed by the total shrinkage test and compressive strength test. The test results showed that mixing both the EX and SRA increases the plastic enlargement of the mortar during the early age more than using either the EX or SRA solely. The steam curing helps to reduce the plastic shrinkage when the mortar is added with the FA and SRA while adding the EX increases the enlargement compared to the normal curing. When the EX, SRA, and FA are all added to the mortar mixing, great attention should be paid due to the increase of greater enlargement. For the compressive strength view, the steam curing increases the compressive strength in all types of mixture. The steam curing significantly helps increasing the compressive strength of mortar with combination of EX, SRA, and FA. Nevertheless, the XRD and SEM tests explain such enlargement accordingly.
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    The contribution agriculture waste reinforcement to the floor topping of renovation building architectures: Compressive strength test by trial the percentage of the pseudostem of banana dried powder
    (2018-08-14)
    Subpa-Asa, Prang
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    Date, Shigeyuki
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    Kasai, Tetsurou
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    Phromsuwansiri, Nutchaphon
    The growing demand of construction around the world has led to an increased usage of concrete. However, convention concrete making materials are not entirely environmental friendly and this has enthused research on seeking greener alternative for concrete production. Agriculture industries are one of the major industries globally that harvested products such as food and biomass for organism around the world. After harvesting products, there are effluence of agriculture waste as left, straw and pseudostem. This research focusing on mechanical properties as compressive Strength Test of mortar cement adding with the pseudostem of banana dried powder (PBDP) by trial the percentage of PBDP and chemical properties as using scanning electron microscope (SEM). These findings indicate that 10% of PBDP replacement is the best ratio and element of PBDP which C was the most element in PBDP as 59.96% of mass and 71.49 % of atomic.
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    Effect of jetties in northern part of coastal change at Chumphon estuary
    (2018-01-01)
    Promngam, Atsanupong
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    Charusrojthanadech, Nunthawath
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    Yamamoto, Yoshimichi
    The research on the effect of coastal facilities for protecting an estuary from channel blockage and a coast from beach erosion by waves demands to understand wave propagation, a nearshore current and sediment transportation. The purpose of this research is to evaluate the effect of jetties to the Chumphon estuary coast in Chumphon province, Thailand, and propose measures for erosion protecting in this coast. The long term prediction by a one-line model indicates the heavy erosion of around 1000 m northward from the jetties, the erosion around 250 m and 650 m southward from the jetties. As for the erosion of around 250 m southward, measures were examined in the last inter-national conference of ISOPE. As for the erosion of around 650 m southward, since there is no property which should be protected, it is ignored here. Therefore, about the heavy erosion of around 1000 m northward, measures are examined. In this study, since almost of all sand must be transported to jetties, sand nourishment is not a good measure. Detached breakwaters, artificial reefs, and non-measures are examined with the costs on the construction or the compensation, and the prevention effect of wave overtopping, short term erosion, and deterioration of a view. It makes clear that the most effective measure is non-measures (in other words, it is “set back”).
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    Effect of expansive additive and shrinkage reducing agent on plastic shrinkage of steam-cured mortar
    (2018-01-01)
    Treesuwan, Sarapon
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    Date, Shigeyuki
    This research is part of the mortar’s plastic shrinkage study. Contents in this article is related to how the Expansive Additive (EX), Shrinkage Reducing Agent (SRA), and Fly Ash (FA) help to reduce and control the shrinkage and to compare the effectiveness of these substances used in the normal curing, i.e., at 30˚C and in the steam curing process by using the factorial design with 3 factors and to be divided into 2 levels. Factors to be studied are the amount of EX, SRA and FA replacement. The test of plastic shrinkage was conducted in accordance with the ASTM C1579-06 standard, placing the strain gauge 0.5 centimeters beneath the surface in the middle of the mold, recording the shrinkage rate starting from the initial setting time for 24 hours. The results showed that, in normal curing, the EX influences the expansion while, in steam curing, the EX and SRA significantly influences the expansion. To add the FA in high volume along with the EX significantly effects the expansion for both the normal and steam curing. Furthermore, the study model and equation for plastic shrinkage of mortar are presented in the form of factor proportion to be considered from the factorial design study basis.
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    Effect of jetties in coastal change at chumphon estuary
    (2017-01-01)
    Promngam, Atsanupong
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    Charusrojthanadech, Nunthawath
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    Yamamoto, Yoshimichi
    The research on the effect of coastal facilities for protecting an estuary from channel blockage and a coast from beach erosion by waves demands to understand wave propagation, nearshore current and sediment transportation. The purpose of this research is to study theeffect of jetty and propose countermeasures to compensate insufficient safety in Chumphon estuary, Chumpon province. The field survey is executed, topographic maps, bathymetric data, wave data for storm surges, tidal data were collected and inputted in Ca's numerical model(Ca et. al., 2000). This model consists of the near shore fluid dynamicmodel based on the Boussinesq equation and the topographical change model which the bed load and the suspended load were considered. Although the jetties are very effective for channel maintenance, since diffraction waves by the jetties has drawn sand in the north-side beachof the jetties toward the jetties, serious coastal erosion has occurred in the center of this north-side beach. Moreover, according to thesimulation results by using Ca's model, in the south-side beach of thejetties, if a typhoon of Linda classes hits this area, since heavy overtopping occurs, wave dissipation facilities are necessary.
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