Chaiyaput, Salisa

Preferred name

Chaiyaput, Salisa

Alternative Name

CHAIYAPUT, SALISA

Chaiyaput, S.

Chaiyaput, Salisa Fern

Main Affiliation

School of Engineering

salisa.ch@kmitl.ac.th

Now showing 1 - 10 of 11

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Prefabricated Vertical Drain (PVD) and Deep Cement Mixing (DCM)/Stiffened DCM (SDCM) techniques for soft ground improvement
(2018-04-12)
Bergado, D. T.
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Long, P. V.
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Chaiyaput, S.
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Balasubramaniam, A. S.
Soft ground improvement techniques have become most practical and popular methods to increase soil strength, soil stiffness and reduce soil compressibility including the soft Bangkok clay. This paper focuses on comparative performances of prefabricated vertical drain (PVD) using surcharge, vacuum and heat preloading as well as the cement-admixed clay of Deep Cement Mixing (DCM) and Stiffened DCM (SDCM) methods. The Vacuum-PVD can increase the horizontal coefficient of consolidation, C<inf>h</inf>, resulting in faster rate of settlement at the same magnitudes of settlement compared to Conventional PVD. Several field methods of applying vacuum preloading are also compared. Moreover, the Thermal PVD and Thermal Vacuum PVD can increase further the coefficient of horizontal consolidation, C<inf>h</inf>, with the associated reduction of k<inf>h</inf>/k<inf>s</inf> values by reducing the drainage retardation effects in the smear zone around the PVD which resulted in faster rates of consolidation and higher magnitudes of settlements. Furthermore, the equivalent smear effect due to non-uniform consolidation is also discussed in addition to the smear due to the mechanical installation of PVDs. In addition, a new kind of reinforced deep mixing method, namely Stiffened Deep Cement Mixing (SDCM) pile is introduced to improve the flexural resistance, improve the field quality control, and prevent unexpected failures of the Deep Cement Mixing (DCM) pile. The SDCM pile consists of DCM pile reinforced with the insertion of precast reinforced concrete (RC) core. The full scale test embankment on soft clay improved by SDCM and DCM piles was also analysed. Numerical simulations using the 3D PLAXIS Foundation finite element software have been done to understand the behavior of SDCM and DCM piles. The simulation results indicated that the surface settlements decreased with increasing lengths of the RC cores, and, at lesser extent, increasing sectional areas of the RC cores in the SDCM piles. In addition, the lateral movements decreased by increasing the lengths (longer than 4 m) and, the sectional areas of the RC cores in the SDCM piles. The results of the numerical simulations closely agreed with the observed data and successfully verified the parameters affecting the performances and behavior of both SDCM and DCM piles.
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Comparative Study of Evaluations of Bearing Capacity Using Conventional Method and Finite Element Method
(2024-01-01)
Manandhar, Suman
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Karmacharya, Sunny
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Vootripruex, Panich
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Chaiyaput, Salisa
Kathmandu Clay, also called the black clay, found near the sub-surface of the valley sediments, incorporating with its low strength and high compressibility. In this research, the vertical bearing capacity of strip footing on Kathmandu Clay was analyzed using Mohr–Coulomb soil model both in drained and undrained conditions through finite elements. The analyses were focused on the failure patterns of the footing for both drained and undrained conditions. The failure analyses showed a varying degree of effects of the friction angle of the soil both in drained and undrained conditions. The results were further compared with Vesic’s and Prandtl’s methods of evaluating bearing capacities. Hence, obtained results of simulated failure plane and the conventional one preceded by Prandtl show a good agreement between each other and validated the results.
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Simulation on small diameter shield for pre-support method by numerical analysis
(2020-01-01)
Sugimoto, Mitsutaka
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Huynh, T. N.
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Chaiyaput, S.
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Lam, L. G.
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Miki, A.
When the road shield tunnels are constructed in urban area, the construction of branch tunnels from a main road tunnel by non-open cut method is required. Therefore, a pre-support method using several small diameter shield tunnels above and below the main shield tunnel was proposed for soft ground under groundwater level. But the small diameter shield tunnel with three dimensional sharp curve has never been constructed before, since it is difficult to control the shield along the planned alignment. Therefore, the shield operation parameters were estimated theoretically and the shield behaviors were simulated to examine the possibility of the shield tunnels using a small diameter shield with 3D sharp curve. As a result, it was confirmed that the calculated shield behavior has a good agreement with the planned one, by adjusting the shield operational parameters.
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Improvement of crushed rock by polymer and portland cement on California Bearing Ratio (CBR) under soaked condition
(2020-01-01)
Chaiyaput, Salisa
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Maleesee, K.
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Sirikaew, U.
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Artidteang, S.
The pavement consists of surface course built on the top followed by base, subbase, and subgrade, respectively. The high stresses occur at the top layer, which is placed by the expensive material with high quality, while cheaper material with low quality is placed in the lower layer, respectively. Crushed rock is normally applied as the base material, which is required to support the high stress transmission. The soil improvement techniques have become one alternative to apply for increasing the soil strength. The one technique has been wildly adopted, is called “soil cement”. On the other hand, the soil cement road is easily to damage by heavy raining and flooding, due to brittle crack behavior in Portland cement property. Consequently, polymer has high elastic modulus, is precious to solve the brittle failure problem. This paper examines the effect of concurrent use of liquid polymer and Portland cement on crushed rock as reinforced pavement base material. The strength of polymer-treated crushed rock (treated crushed rock) and ordinary crushed rock (untreated crushed rock) were characterized and compared. In strength analysis, the California bearing ratios (CBR) of untreated and treated crushed rock were determined under soaked condition to simulate post-flood pavement damage. As a result, it was found that the CBR value of the treated crushed rock has higher than the CBR values of the untreated crushed rock (approximately two times).
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Utilization of asphalt waste Dust and fly ash for sustainable mortar
(2025-01-23)
Ayawanna, Jiratchaya
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Kingnoi, Namthip
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Sertsoongnern, Pimchanok
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Chaiyaput, Salisa
This study presents a utilization of asphalt waste dust (AD) as a filler material to replace sand in a mortar. Moreover, fly ash (FA) is utilized as an additive of pozzolanic material. The compressive strength and microstructures were investigated to propose the suitable ratio of AD and FA for sustainable mortar. All samples were fixed with a mixing ratio of ordinary Portland cement (CM): sand (Si) at 1: 2.75. The Si was replaced by AD content at 0, 50, 60, 70, 80, 90, and 100% by weight (%wt) of Si, respectively. Furthermore, the FA was added to the suitable mixing conditions of CM, AD, and Si, which is called the suitable mortar containing AD, at 0, 10, 20, 30, and 40 %wt. The results from the compressive strength test were evaluated and compared under the different curing times for 3, 7, and 28 days in saturated limewater. The microstructures of testing samples were analyzed using different characterization techniques including X-ray diffraction (XRD) and scanning electron microscopy (SEM) with energy-dispersive X-ray spectroscopy (SEM-EDS). From the results, the mortar containing AD showed higher compressive strength than those without AD. After the addition of FA and AD, the compressive strength was more increased rather than using AD without FA. Sand can be replaced with AD as filler aggregates to reduce voids in the mortar. Additionally, FA can be used as a pozzolanic additive in mortars. Therefore, those two waste materials (AD and FA) are alternative materials suitable for use in the development of compressive strength in mortar.
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Evaluation method on ground movement using continuum ground model
(2021-01-01)
Sugimoto, M.
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Chen, J.
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Anh, P. T.
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Manabe, K.
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Lam, L. G.
To analyze the ground movement and the influence of shield tunneling above tunnel structures, the continuum ground model with segmental lining is in use. The analysis region in the transverse section should confirm that the side boundaries do not give significant effects on the analysis results. On the other hand, the lower analysis region is selected based on the empirical value to fit the analysis result for the measured data in practice. The effects of tunnel excavation in the numerical analysis are classified into two parts: one is the unloading effect because of the removal of the soil weight at the tunnel section, and the other is the effect of stiffness reduction inside the tunnel. The former heaves the ground around the tunnel, of which the magnitude increases as the distance from the tunnel invert to the bottom of the analysis region increases. This influence increases as the ground stiffness decreases. This is because the numerical analysis is based on the stress–strain relationship and the displacement comes from the distance multiplying with strain in the case of the elastic model. The latter one causes the upper part of the ground around the tunnel to move toward the tunnel, which decreases the ground reaction. The analysis results include both effects. This study shows both effects on ground displacements separately, taking the lateral region size W and the lower region size d as parameters, and discusses the method to evaluate the analysis results.
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Successful mitigations of riverbank slope stabilizations and road failures caused by excessive rainfalls due to climate change at national road 1B (NR 1B) in Laos PDR
(2020-01-01)
Bergado, Dennes T.
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Chaiyaput, S.
The sites of the successful road embankment and pavement repairs were located in Laos PDR at National Road 1B (NR 1B). National Road (NR) 1B connects Laos to China. Illustrations of the road embankment and pavement failures and their successful mitigations are discussed. The mitigations of the first case (Case 1) consist of PEC-150 geotextile reinforcements with gabions and wrapped around soil bag facing combined with intercepting trench drains wrapped around with TS-50 geotextiles. In the second case (Case 2), the proposed pavement repairs consisted of intercepting trench drains wrapped around with TS-50 geotextiles combined with PEC-150 geotextile reinforcements of the gravel sub-base replacing the upper portions of the embankments underlying the pavements. The intercepted subsurface seepage lowered the water table and collected and safely directed the seepage flow to drainage pipes and channels.
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Utilization of Waste Material for Stabilization of Lateritic Soil
(2024-01-01)
Chaiyaput, Salisa
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Ayawanna, Jiratchaya
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Manandhar, Suman
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Sae-Ueng, Songklod
The waste materials from the manufacturing process were employed for the purpose of enhancing the strength of lateritic soil grade E, which exhibited the least suitable mechanical properties. The present study focused on the investigation of waste materials from the steel manufacturing process, namely electric arc furnace (EAF) slag and ladle furnace (LF) slag, as well as waste material from asphalt concrete plants, specifically asphalt waste dust (AWD). These waste materials were examined in relation to their potential utilization in combination with lateritic soil. The mixing ratio employed in this investigation was 10% by weight (wt%). A mixture of 5 wt% ordinary Portland cement was mixed with 90 wt% lateritic soil and 10 wt% asphalt waste dust to enhance the efficiency of lateritic soil stabilization. The efficiency of waste materials was evaluated by the California bearing ratio (CBR) test. The integration of EAF slag and LF slag, byproducts of the steel manufacturing process, significantly improved the CBR more than 5 times and 7 times, respectively, for EAF and LF mixes compared to natural lateritic soil. Furthermore, the CBR of lateritic soil blended with asphalt waste dust and Portland cement exhibited approximately 20 times higher than that of natural lateritic soil and cement-stabilized lateritic soil.
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Fundamental Experiment of Slope Reinforcement Synergistic Effect by Reinforcing Frame Structure Installed in Embankment and Tree Root System
(2023-01-01)
Yamagata, Ryuzo
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Chaiyaput, Salisa
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Nishino, Fumitaka
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Takei, Masaomi
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Sugiyama, Motohiro
In the Great East Japan Earthquake of March 2011, a part of huge amount of earthquake and ‘tsunami’ waste was reused as a foundation material for new seawalls (embankments). The authors hypothesized that by using a reinforcing bar frame structure in the embankment instead of the earthquake waste, the root system of the trees planted on the embankment would entwine with this structure and reinforce the ground. Laboratory and field model tests were conducted for up to four years and confirmed that the tree root system was entwined with reinforcing bars and that the reinforcing bar frame structure reduced the earth pressure.
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Using Multi-Channel Surface Analysis of Surface Waves and Resistivity Survey to Evaluate Road Damage
(2026-01-01)
Suksawat, Taweephong
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Ayawanna, Jiratchaya
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Chaiyaput, Salisa
The study provides an analysis of road damage, which was Pathum Thani rural road no. 3012 (PT. 3012), in the Pathum Thani province, Thailand. A road was constructed along the irrigation canal with the construction of a retaining wall, while the roadway was supported with a foundation consisting of soil-cement columns. Longitudinal cracks and settlements appeared between the roadway and the road shoulder within five years after the completion of road construction. To evaluate and confirm the aforementioned problem, the soil investigation was utilized. Conventional geotechnical investigations often involve the utilization of in situ tests as the primary method, resulting in the collection of soil samples at specific locations, which do not cover a large area in the construction site. Therefore, this study aims to propose the combination of multi-channel analysis of surface waves (MASW) and resistivity survey techniques, which were employed to identify and evaluate the underlying cause of the observed damage by effectively identifying the subsurface layer throughout a large area under undisturbed conditions. The soil investigation results confirmed that the differential settlement occurred because the roadway was supported by soil-cement columns, while the road shoulder was not supported by soil-cement columns. Consequently, it was easy to recognize and confirm the problem with the imaging of the subsurface layers from the findings of those MASW and resistivity survey approaches.

Chaiyaput, Salisa

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