http://repository.rmutp.ac.th:80/handle/123456789/101 2013-05-16T06:15:47Z 2013-05-16T06:15:47Z Rukzon, Sumrerng Chindaprasirt, Prinya http://repository.rmutp.ac.th:80/handle/123456789/350 2013-02-26T10:33:38Z 2008-07-12T00:00:00Z

Title: Use of waste ash from various by-product materials in increasing the durability of mortar Authors: Rukzon, Sumrerng; Chindaprasirt, Prinya Abstract: This paper presents a study on the strength and corrosion resistance of mortars made with binary blends of ordinary Portland cement (OPC) and ground rice husk ash (RHA) or ground palm oil fuel ash (POA). The mortar mixtures were made with Portland cement Type I containing 0-40% RHA and POA. RHA and POA with 1-3% by weight retained on a sieve No.325 were used. The water to binder ratio was kept constant at 0.5 and the flow of mortar was maintained at 110±5% with the aid of superplasticizer (SP). Scanning electron microscopy (SEM) was used for analysis. The compressive strength, chloride penetration and corrosion resistance of the mortar were determined. The results show that strength as well as the resistance of mortar to chloride and corrosion can be improved by blending with RHA and POA. Thus, RHA and POA have a high potential to be used as a good pozzolanic material. Description: This paper presents a study on the strength and corrosion resistance of mortars made with binary blends of ordinary Portland cement (OPC) and ground rice husk ash (RHA) or ground palm oil fuel ash (POA).

2008-07-12T00:00:00Z Rukzon, Sumrerng http://repository.rmutp.ac.th:80/handle/123456789/349 2013-02-27T04:32:46Z 2009-09-01T00:00:00Z

Title: Use of disposed waste ash from landfills to replace Portland cement Authors: Rukzon, Sumrerng Abstract: In this study, waste ash was utilized as a pozzolanic material in blended Portland cement in order to reduce negative environmental effects and landfill volume required to dispose of waste ash. The influence of waste ash, namely palm oil fuel ash, rice husk ash and fly ash on compressive strength and sulfate resistance in mortar were studied and evaluated by some accelerated short–term techniques in sodium sulfate solutions. Ordinary Portland cement (OPC) was partially replaced with ground palm oil fuel ash (POA), ground rice husk ash (RHA) and classified fly ash (FA). Single pozzolan and a blend of equal weight portions of POA, RHA and FA were also used. The resistance to sulfate attack of mortar improves substantially with partial replacement of OPC with POA, RHA and FA. The use of a blend of equal weight portions of FA and POA or RHA produced mixes with good strength and resistance to sulfate attack. POA, RHA and FA have a high potential to be used as a pozzolanic material. Description: In this study, waste ash was utilized as a pozzolanic material in blended Portland cement in order to reduce negative environmental effects and landfill volume required to dispose of waste ash.

2009-09-01T00:00:00Z Sootkaneung, Warin http://repository.rmutp.ac.th:80/handle/123456789/348 2013-02-26T10:29:09Z 2005-01-01T00:00:00Z

Title: The Design of Bit-Serial Lattice Wave Digital Filter Using FPGA Authors: Sootkaneung, Warin Abstract: This article describes an efficient approach to the implementation of bit-serial lattice wave digital filters based on field programmable gate array (FPGA). In this paper, a time schedule of all of the bit-serial two-port adaptors is presented as a bridge between conception and completion. Finally, with the satisfying frequency response, the filter is successfully tested by both computer simulation and real signal measured from the programmed FPGA. Description: This article describes an efficient approach to the implementation of bit-serial lattice wave digital filters based on field programmable gate array (FPGA).

2005-01-01T00:00:00Z Chindaprasirt, Prinya Rukzon, Sumrerng http://repository.rmutp.ac.th:80/handle/123456789/347 2013-02-26T10:32:08Z 2007-08-10T00:00:00Z

Title: Strength, porosity and corrosion resistance of ternary blend Portland cement, rice husk ash and fly ash mortar Authors: Chindaprasirt, Prinya; Rukzon, Sumrerng Abstract: This paper presents a study of the strength, porosity and corrosion resistance of mortars made with ternary blends of ordinary Portland cement (OPC), ground rice husk ash (RHA) and classified fly ash (fine fly ash, FA). Compressive strength, porosity and accelerated corrosion with impressed voltage (ACTIV) were tested. The results show that the use of ternary blend of OPC, RHA and FA produces mortars with improved strengths at the low replacement level with RHA and FA and at the later age in comparison to that of OPC mortar. The porosity of mortar containing pozzolan reduces with the low replacement level of up to 20% of pozzolan, but increases with the 40% replacement level. The chloride induced corrosion resistance of mortar as measured by ACTIV is, however, significantly improved with the use of both single pozzolan and the ternary blend OPC, RHA and FA. The corrosion resistance of ternary blend mortar is higher than that of mortar containing single pozzolan. The use of ternary blend OPC, RHA and FA is very effective in enhancing chloride induced corrosion of mortar. Description: This paper presents a study of the strength, porosity and corrosion resistance of mortars made with ternary blends of ordinary Portland cement (OPC), ground rice husk ash (RHA) and classified fly ash (fine fly ash, FA). Compressive strength, porosity and accelerated corrosion with impressed voltage (ACTIV) were tested.

2007-08-10T00:00:00Z Rukzon, Sumrerng Chindaprasirt, Prinya http://repository.rmutp.ac.th:80/handle/123456789/346 2013-02-26T10:31:41Z 2008-06-15T00:00:00Z

Title: Strength and chloride resistance of blended Portland cement mortar containing palm oil fuel ash and fly ash Authors: Rukzon, Sumrerng; Chindaprasirt, Prinya Abstract: This paper presented a study on the strength and chloride resistance of mortars made with ternary blends of ordinary Portland cement (OPC), ground palm oil fuel ash (POA), and classified fly ash (FA). The mortar mixtures were made with Portland cement type I containing 0-40wt% FA and POA. FA and POA with 1wt%-3wt% retained on a sieve No.325 were used. The compressive strength and rapid chloride penetration depth of mortars were determined. The results reveal that the use of ternary blended cements produces good strength mortars. The use of the blend of FA and POA also produces high strength mortars and excellent resistance to chloride penetration owing to the synergic effect of FA and POA. A mathematical analysis and two-parameter polynomial model were presented to predict the compressive strength. The mathematical model correlated well with the experimental results. The computer 3-D graphics of strength of the ternary blended mortars were also constructed and could be used to aid the understanding and the proportioning of the blended system. Description: This paper presented a study on the strength and chloride resistance of mortars made with ternary blends of ordinary Portland cement (OPC), ground palm oil fuel ash (POA), and classified fly ash (FA). The mortar mixtures were made with Portland cement type I containing 0-40wt% FA and POA. FA and POA with 1wt%-3wt% retained on a sieve No.325 were used. The compressive strength and rapid chloride penetration depth of mortars were determined.

2008-06-15T00:00:00Z Pradmali, Sajjachan Buranathanitt, Tavicha Khumput, Pracham http://repository.rmutp.ac.th:80/handle/123456789/345 2013-02-26T10:31:16Z 2005-10-18T00:00:00Z

Title: Regional Flow Duration Curves for Wang River Basins Authors: Pradmali, Sajjachan; Buranathanitt, Tavicha; Khumput, Pracham Abstract: In this studies, the regional flow duration curves were prepared for Wang River Basins. More than 10-year daily flow records of 10 selected gauging stations in these river basins (catchment areas ranging from 95.7 to 10,442 square kilometers) were used in the analysis. The flow duration curves and dimensionless flow duration curves were construced at the gauging stations. In the regional analysis, river basins were devided into 3 subregions of similar hydrological condition. The regional flow duration curves models were constructed for each subregion, in which an equations for predicting the mean dischage and the maximum percent of time from physical parameters of the catchment were proposed for each subregion .The curves and equations obtained from this study could be used to estimate the design flow duration curve of any specified percent of time at any location, gauged or unguaged, within these river basins. Description: In this studies, the regional flow duration curves were prepared for Wang River Basins.

2005-10-18T00:00:00Z Chindaprasirt, Prinya Rukzon, Sumrerng http://repository.rmutp.ac.th:80/handle/123456789/344 2013-02-26T10:30:47Z 2009-01-01T00:00:00Z

Title: Pore Structure Changes of Blended Cement Pastes Containing Fly Ash, Rice Husk Ash, and Palm Oil Fuel Ash Caused by Carbonation Authors: Chindaprasirt, Prinya; Rukzon, Sumrerng Abstract: In this paper, the effects of carbonation on pore structure of blended pozzolan cement pastes were investigated. Ordinary Portland cement _OPC_ was partially replaced with ground palm oil fuel ash _POA_, ground rice husk ash _RHA_ and classified fine fly ash _FA_. The strength, total porosity, specific surface area, and pore size distribution were tested. In general, incorporation of pozzolans increased the total porosity of blended cement pastes in comparison to that of OPC paste. Carbonation of pastes under 5% CO2 and 50% relative humidity _RH_ for 28 days resulted in filling of the pore voids and possible attack on calcium silicate hydrate _CSH_ depending on the type of pozzolan used. After carbonation, total porosity decreased and specific surface areas of the blended pozzolan cement pastes reduced indicating the infilling of voids. Pore size distributions of POA and RHA pastes were different to those of FA pastes. Large pores of the POA and RHA pastes were increased indicating coarsening of pores owing to possible attack on CSH. It is possible that POA and RHA were highly reactive and hence their uses resulting in severe carbonation compared to use of FA. Description: In this paper, the effects of carbonation on pore structure of blended pozzolan cement pastes were investigated. Ordinary Portland cement _OPC_ was partially replaced with ground palm oil fuel ash _POA_, ground rice husk ash _RHA_ and classified fine fly ash _FA_. The strength, total porosity, specific surface area, and pore size distribution were tested.

2009-01-01T00:00:00Z Rukzon, Sumrerng Chindaprasirt, Prinya Mahachai, Rattana http://repository.rmutp.ac.th:80/handle/123456789/343 2013-02-26T10:29:57Z 2009-04-01T00:00:00Z

Title: Effect of grinding on chemical and physical properties of rice husk ash Authors: Rukzon, Sumrerng; Chindaprasirt, Prinya; Mahachai, Rattana Abstract: The effect of grinding on the chemical and physical properties of rice husk ash was studied. Four rice husk ashes with different finenesses, i.e. coarse original rice husk ash (RHA0), RHA1, RHA2, and RHA3 were used for the study. Ordinary Portland cement (OPC) was partially replaced with rice husk ash at 20% by weight of binder. The water to binder ratio (W/B) of the mortar was maintained at 110%±5% with flow table test. Specific gravity, fineness, chemical properties, compressive strength, and porosity test of mortars were determined. The differences in chemical composition of the rice husk ashes with different finenesses from the same batch are small. The use of RHA3 produces the mortars with good strength and low porosity. The strength of the mortar improves with partial replacement of RHA3 in comparison with normal coarse rice husk ash. The use of RHA3 results in a strong and dense mortar, which is due to the better dispersion and filling effect, as well as an increase in the pozzolanic reaction. Description: The effect of grinding on the chemical and physical properties of rice husk ash was studied. Four rice husk ashes with different finenesses, i.e. coarse original rice husk ash (RHA0), RHA1, RHA2, and RHA3 were used for the study.

2009-04-01T00:00:00Z Rukzon, Sumrerng Chindaprasirt, Prinya http://repository.rmutp.ac.th:80/handle/123456789/342 2013-02-26T10:29:32Z 2008-01-01T00:00:00Z

Title: Development of Classified Fly Ash as a Pozzolanic Material Authors: Rukzon, Sumrerng; Chindaprasirt, Prinya Abstract: This research studies the potential for using classified fly ash from Mae Moh power plant in Thailand as a pozzolanic material. Three different fly ash finenesses viz., coarse Original Fly Ash (OFA), Medium Fly Ash (MFA) and Fine Fly Ash (FFA) were used for the study. Ordinary Portland Cement (OPC) was partially replaced with fly ash at 20 and 40% by weight of binder. The water to binder ratio was kept constant at 0.5 and the flow of mortar was maintained at 110±5% with the aid of superplasticizer (SP). Compressive strength, carbonation depth and porosity test of mortars were determined. FFA has a high potential to be used as a good pozzolanic material. The use of FFA produces mortars with good strength and low porosity. The resistance to carbonation of mortar improves with partial replacement of FFA in comparison with the normal coarse fly ash. The use of FFA results in a strong and dense mortar which is due to better dispersion and filling effect as well as an increase in the pozzolanic reaction. Description: This research studies the potential for using classified fly ash from Mae Moh power plant in Thailand as a pozzolanic material.

2008-01-01T00:00:00Z Rukzon, Sumrerng Chindaprasirt, Prinya http://repository.rmutp.ac.th:80/handle/123456789/341 2013-02-26T10:30:24Z 2009-01-01T00:00:00Z

Title: An Experimental Investigation of the Carbonation of Blended Portland Cement Palm Oil Fuel Ash Mortar in an Indoor Environment Authors: Rukzon, Sumrerng; Chindaprasirt, Prinya Abstract: In this research, palm oil fuel ash was utilized as a pozzolanic material in blended Portland cement mortar. The mortar was tested on the normal compressive strength and the negative effect of carbonation in indoor environment using the accelerated carbonation test of 5% CO2 in 50% relative humidity. Three palm oil fuel ash fractions of different fineness, viz., coarse original palm oil fuel ash (CPOA), medium palm oil fuel ash (MPOA) and fine palm oil fuel ash (FPOA) were used for the study. Ordinary Portland cement (OPC) was partially replaced by these palm oil fuel ashes at the dosages of 20% and 40% by weight of binder. The results showed that the incorporation of the ashes affected the strength and the carbonation depths of mortars. The strengths of mortar slightly decreased with the increases in the dosage of the ash. The fineness of ash, on the other hand, improved the strength and the carbonation of the mortars. The mortars containing FPOA exhibited high strength and relatively low carbonation in comparison to those using coarser MPOA and CPOA. The use of FPOA resulted in a strong and dense mortar owing to the increased packing effect and pozzolanic reaction. It was therefore, demonstrated that the FPOA could be used as a pozzolanic material to replace part of Portland cement for use in the indoor environment. Description: This research, palm oil fuel ash was utilized as a pozzolanic material in blended Portland cement mortar. The mortar was tested on the normal compressive strength and the negative effect of carbonation in indoor environment using the accelerated carbonation test of 5% CO2 in 50% relative humidity. Three palm oil fuel ash fractions of different fineness, viz., coarse original palm oil fuel ash (CPOA), medium palm oil fuel ash (MPOA) and fine palm oil fuel ash (FPOA) were used for the study. Ordinary Portland cement (OPC) was partially replaced by these palm oil fuel ashes at the dosages of 20% and 40% by weight of binder.

2009-01-01T00:00:00Z