Characteristics of expansive soils improved with cement and fly ash in Northern Thailand

Voottipruex, Panich,Jamsawang, Pitthaya Techno-Press 2014 Geomechanics & engineering Vol.6 No.5

This paper studies the swelling and strength characteristics of unimproved and improved expansive soils in terms of the swell potential, swelling pressure, rate of secondary swelling, unconfined compressive strength and California bearing ratio (CBR). The admixtures used in this study are locally available cement and fly ash. The soils used in this study were taken from the Mae Moh power plant, Lampang Province, in northern Thailand. A conventional consolidation test apparatus was used to determine the swelling of the soil specimen. The optimum admixture contents are determined to efficiently reduce the swelling of unimproved soil. The rate of secondary swelling for unimproved soil is within the range of highly plastic montmorillonite clay, whereas the specimens improved with optimum admixture contents can be classified as non-swelling kaolinite. A soil type affects the swelling pressure. Expansive soil improvement with fly ash alone can reduce swelling percentage but cannot enhance the unconfined compressive strength and CBR. The strength and swelling characteristics can be predicted well by the swelling percentage in this study.

Reuse of dredged sediments as pavement materials by cement kiln dust and lime treatment

Yoobanpot, Naphol,Jamsawang, Pitthaya,Krairan, Krissakorn,Jongpradist, Pornkasem,Horpibulsuk, Suksun Techno-Press 2018 Geomechanics & engineering Vol.15 No.4

This paper presents an investigation on the properties of two types of cement kiln dust (CKD)-stabilized dredged sediments, silt and clay with a comparison to hydrated lime stabilization. Unconfined compressive strength (UCS) and California bearing ratio (CBR) tests were conducted to examine the optimal stabilizer content and classify the type of highway material. A strength development model of treated dredged sediments was performed. The influences of various stabilizer types and sediment types on UCS were interpreted with the aid of microstructural observations, including X-ray diffraction and scanning electron microscopy analysis. The results of the tests revealed that 6% of lime by dry weight can be suggested as optimal content for the improvement of clay and silt as selected materials. For CKD-stabilized sediment as soil cement subbase material, the use of 8% CKD was suggested as optimal content for clay, whereas 6% CKD was recommended for silt; the overall CBR value agreed with the UCS test. The reaction products calcium silicate hydrate and ettringite are the controlling mechanisms for the mechanical performance of CKD-stabilized sediments, whereas calcium aluminate hydrate is the control for lime-stabilized sediments. These results will contribute to the use of CKD as a sustainable and novel stabilizer for lime in highway material applications.

Culture-Specific Number Symbolism in Restaurant Prices

Udo Wagner,Jutatip Jamsawang 연세대학교 동서문제연구원 2014 Global economic review Vol.43 No.1

Most cultures assign additional meanings to numbers, beyond their prevalent (arithmetic) denotation. Such connotations might extend to other settings too, such as price perceptions. Therefore, this study summarizes the (positive and negative) characteristics associated with certain numbers by traditions, religious faith, and cultural heritage. The empirical investigation focuses on restaurant prices in three cultural settings (Chinese, Indian, and Islamic), facilitated by the increasing proportions of multicultural populations and numbers of ethnic restaurants. Consistent with predictions, the number 8 for Chinese, number 7 for Islamic, and numbers 5 and 9 for Indian products are more common in the cross-cultural comparison.

BELIEFS, GLOBAL ATTITUDE AND ACCEPTANCE OF COMPARATIVE ADVERTISING: ETIC DIMENSIONS FOR CROSS-CULTURAL RESEARCH

José I. ROJAS-MÉNDEZ,Jutatip JAMSAWANG,Gina M. PIPOLI 글로벌지식마케팅경영학회 2014 Global Marketing Conference Vol.2014 No.4

The main purpose of this paper is to find the etic dimensions of beliefs towards comparative advertising (CA) and to test their relationship with global attitude and acceptance of CA in a cross-cultural setting. Samples from four linguistic and cultural different countries were used: Austria, Canada, China and Peru. The research instrument was an online questionnaire. Results uncovered three main etic belief dimensions: truthfulness and deceitfulness as societal (micro) variables, and product information as personal (micro) variable. Invariance tests indicate that the items comprising the scales proposed to measure CA beliefs, global attitude and acceptance of CA possess equivalence across the four countries. Our model shows that beliefs indirectly affect acceptance of CA, which is mediated by global attitude toward CA. Results reveal similarities and differences across countries on the magnitude and importance of the beliefs and global attitude total effects upon acceptance. Finally, results are analyzed vis-à-vis the Hofstede’s national cultural dimensions, which indicate that uncertainty avoidance and individualism/collectivism help to explain the main differences across the countries.

BELIEFS, GLOBAL ATTITUDE AND ACCEPTANCE OF COMPARATIVE ADVERTISING: ETIC DIMENSIONS FOR CROSS-CULTURAL RESEARCH

Jos? I. ROJAS-M?NDEZ,Jutatip JAMSAWANG,Gina M. PIPOLI 글로벌지식마케팅경영학회 2014 Global Marketing Conference Vol.2014 No.7

The main purpose of this paper is to find the etic dimensions of beliefs towards comparative advertising (CA) and to test their relationship with global attitude and acceptance of CA in a cross-cultural setting. Samples from four linguistic and cultural different countries were used: Austria, Canada, China and Peru. The research instrument was an online questionnaire. Results uncovered three main etic belief dimensions: truthfulness and deceitfulness as societal (micro) variables, and product information as personal (micro) variable. Invariance tests indicate that the items comprising the scales proposed to measure CA beliefs, global attitude and acceptance of CA possess equivalence across the four countries. Our model shows that beliefs indirectly affect acceptance of CA, which is mediated by global attitude toward CA. Results reveal similarities and differences across countries on the magnitude and importance of the beliefs and global attitude total effects upon acceptance. Finally, results are analyzed vis-?-vis the Hofstede’s national cultural dimensions, which indicate that uncertainty avoidance and individualism/collectivism help to explain the main differences across the countries.

Deformation analysis of high CFRD considering the scaling effects

Sukkarak, Raksiri,Pramthawee, Pornthap,Jongpradist, Pornkasem,Kongkitkul, Warat,Jamsawang, Pitthaya Techno-Press 2018 Geomechanics & engineering Vol.14 No.3

In this paper, a predictive method accounting for the scaling effects of rockfill materials in the numerical deformation analysis of rockfill dams is developed. It aims to take into consideration the differences of engineering properties of rockfill materials between in situ and laboratory conditions in the deformation analysis. The developed method is based on the modification of model parameters used in the chosen material model, which is, in this study, an elasto-plastic model with double yield surfaces, i.e., the modified Hardening Soil model. Datasets of experimental tests are collected from previous studies, and a new dataset of the Nam Ngum 2 dam project for investigating the scaling effects of rockfill materials, including particle size, particle gradation and density, is obtained. To quantitatively consider the influence of particle gradation, the coarse-to-fine content (C/F) concept is proposed in this study. The simple relations between the model parameters and particle size, C/F and density are formulated, which enable us to predict the mechanical properties of prototype materials from laboratory tests. Subsequently, a 3D finite element analysis of the Nam Ngum 2 concrete face slab rockfill dam at the end of the construction stage is carried out using two sets of model parameters (1) based on the laboratory tests and (2) in accordance with the proposed method. Comparisons of the computed results with dam monitoring data indicate that the proposed method can provide a simple but effective framework to take account of the scaling effect in dam deformation analysis.