Keelung, Taiwan
Keelung, Taiwan

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Hsieh S.,2 Pei Ning Road | Huang R.,2 Pei Ning Road | Chi M.,Chiankuo Rd | Liang P.,2 Pei Ning Road
Key Engineering Materials | Year: 2015

Corrosion of rebar in reinforced concrete is a major problem affecting the integrity and loading capacity of the structures. Usually concrete pore solution provides high alkaline environment to protect steel from corrosion. However, the ingress of chloride ions or carbon dioxide would reduce the alkalinity and destroy the stable oxide film which could accelerate the corrosion process of rebar. This study was aimed to evaluate the combined effect of pH and chloride contents on corrosion behavior of rebar using simulated concrete pore solutions. Weight-loss measurement were performed to obtain the corrosion rate. Meanwhile, explore the effect of carbonation and chloride contents to Half-cell potential value on mortar and concrete. Test results show that both pH and chloride content are significant factors influencing the corrosion behavior of rebar. Higher corrosion rate was found in the rebar immersed in the solutions with smaller pH and higher chloride content. © (2015) Trans Tech Publications, Switzerland.

Chi M.-C.,Chiankuo Rd. | Chang J.-J.,2 Pei Ning Road | Huang R.,2 Pei Ning Road | Weng Z.-L.,40 Zhongshan North Road
Advanced Materials Research | Year: 2012

The purpose of this study is to investigate the effect of various contents and modulus ratios of alkali activators on strength development and drying shrinkage of alkali-activated slag pastes. Experimental results show that the alkali-modulus ratio is the key factor influencing pH value and drying shrinkage. The lower the alkali-modulus ratio is, the higher the pH value is, and the lower the drying shrinkage is. In addition, the increase of the amount of alkali-activators decreases the initial and final setting time. The compressive strength of alkali-activated slag pastes is higher than that of Portland cement paste at all ages. © (2012) Trans Tech Publications, Switzerland.

Chi M.,Sec 2 | Huang R.,2 Pei Ning Road | Wu T.,2 Pei Ning Road | Fou T.,2 Pei Ning Road
Key Engineering Materials | Year: 2015

Circulating fluidized bed combustion (CFBC) fly ash is a promising admixture for construction and building materials due to its pozzolanic activity and self-cementitious property. In this study, CFBC fly ash and coal-fired fly ash were used in Portland cement to investigate the pozzolanic and cementitious characteristics of CFBC fly ash and the properties of cement-based composites. Tests show that CFBC fly ash has the potential instead of cementing materials and as an alternative of pozzolan. In fresh specimens, the initial setting time of mortars increases with the increasing amount of cement replacement by CFBC fly ash and coal-fire fly ash. In harden specimens, adding CFBC fly ash to replace OPC reduces the compressive strength. Meanwhile, CFBC fly ash would results in a higher length change when adding over 30%. Based on the results, the amount of CFBC fly ash replacement cement was recommended to be limited below 20%. © (2015) Trans Tech Publications, Switzerland.

Chi M.,Sec 2 | Huang R.,2 Pei Ning Road | Lu W.,Sec 2
Applied Mechanics and Materials | Year: 2012

This study presents an investigation into high-temperature resistance of alkali-activated slag concrete (AASC). Sodium oxide (Na2O) concentrations of 4%, 5% and 6% of slag weight and liquid sodium silicate (SiO2) with modulus ratio of 0.8 (mass ratio of SiO2 to Na2O) were used as activators to activate granulated blast furnace slag (GBFS). All cylindrical specimens with the same binder content and liquid/binder ratio of 0.5 were cast and cured in the air, under the saturated limewater and in a curing room at relative humidity of 80% RH and temperature of 60 °C, respectively. Test results demonstrate that the high-temperature resistance of AASC decreased with an increase of temperature. The compressive strength and high-temperature resistance of AASC improved with an increase dosage of Na2O and AASC cured at relative humidity of 80% RH and temperature of 60 °C has the superior performance, followed the AASC by air curing and saturated limewater curing. The higher compressive strength and superior high-temperature resistance have been obtained in AASC than comparable OPC. © (2012) Trans Tech Publications, Switzerland.

Huang H.-Y.,2 Pei Ning Road | Fuh K.-H.,2 Pei Ning Road | Wu J.-S.,2 Pei Ning Road
Advanced Materials Research | Year: 2011

This study is to develop a tool system, which is formed by a series of procedures, modifications, and assemblies, and to learn how processing characteristics are affected and what various processing parameters are. According to the cutting tool compressibility and clamping devices of rigidity and flexibility, three distinct combinations are as follows, that is (1) rigid clamping devices with hard cutting tools, (2) flexibile clamping devices with hard cutting tools, and (3) rigid clamping devices with soft cutting tools. The first are generally cutting processes, while the second are polishing processes and the third produce milling wipe or grinding and polishing compound processes. The cutting part is quite different and may cause different accuracy and removing rate. The mixture processes, such as turn-burnishing, milling-burnishing and grind-polishing, are existed. If certain flexible clamping devices with hard cutting tools are formed, the most suited to this process will be practical benefits. Considering the flexible cutting tools of clamping devices are less systematically designed, this study would mainly focus on the establishment of a systematic design, and actual cutting to explore its applications. In order to take into account the characteristics of flexibility and reduction of the retardation when connected, meanwhile, to meet not only the fixture complexity and availability (being easy) to manufacturing, but also to fit the strength and processing requirements, the systematic design is to create a tool system. After some cutting experiments have been conducted, the results proved that different degrees of flexibility on the workpiece surface would lead to different degrees of accuracy. © (2011) Trans Tech Publications Switzerland.

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