http://210.212.227.212:8080/xmlui/handle/123456789/274 Sun, 17 May 2026 00:04:29 GMT 2026-05-17T00:04:29Z http://210.212.227.212:8080/xmlui/handle/123456789/450 SUBGRADE STABILIZATION USING ALKALI ACTIVATED RICE HUSK ASH Mohammed, Zayan; Anandu, V G The pavement performance is determined by the behaviour of the subgrade soil and its bearing capacity. Expansive subgrade soil is problematic to the pavement and other types of construction activities due to its excessive swelling and shrinkage, necessitating stability with various materials. Soil stabilization using different chemicals have been used to improve the soil property to make them suitable for the desired engineering purpose. Expansive subgrade can be stabilized using alkali activated slag, fly ash and other waste materials and this also helps in solving disposal difficulties. The purpose of the current work is to strengthen Black Cotton Soil (BCS) with alkali activated Rice Husk Ash (RHA) and to design flexible pavement using IITPAVE software (based on IRC 37-2018). This research explains the behaviour of the modified expansive soil for highway subgrade with liquid alkaline activator stabilizer and RHA. A combination of sodium hydroxide and sodium silicate was utilized as the liquid alkaline activators. Sodium oxide (Na2O) and silica modulus (Ms) are the activator parameters selected for the investigation and were varied in different proportions. Unconfined Compression Strength test and Durability test were used to study the effect of different proportions of alkali activated RHA and activator parameters at different curing durations. CBR test, Swelling test and Flexural strength test were done on samples that have passed the Durability test and Unconfined Compressive Strength (UCS) with the highest compressive strength. This soil treatment enhanced the CBR, UCS, durability and flexural strength of the BCS. The swelling was also significantly reduced. Wed, 10 May 2023 00:00:00 GMT http://210.212.227.212:8080/xmlui/handle/123456789/450 2023-05-10T00:00:00Z http://210.212.227.212:8080/xmlui/handle/123456789/449 ROLE OF REJUVENATORS AND THEIR EFFECT ON THE PERFORMANCROLE OF REJUVENATORS AND THEIR EFFECT ON THE PERFORMANCE AND AGING CHARACTERISTICS OF BITUMENE AND AGING CHARACTERISTICS OF BITUMEN Sukanya, K. R.; Kavitha, Madhu The field of pavement engineering is at the verge of resource depletion and the need of construction materials are increasing in exponential manner, it is required to check the suitability of different alternative to replace the need of virgin materials. Suitability refers to the structural and functional performance of the pavement towards loading and other external factors like solar radiation, environmental and climatic factors. In order to reduce the usage of non-renewable virgin raw materials for the construction of flexible pavement, milled material called Recycled Asphalt Pavement (RAP) can be used. Therefore, the work analyses the effect of rejuvenators in restoring the binder properties in a hot mix for pavement construction with RAP. Various tests based on physical, chemical and rheological properties were done to ascertain the suitability of binder. Rate of deterioration of binder properties due to various aging conditions like short term (Rolling Thin Film Oven -RTFO test) and long term (recovered RAP binder) aging are considered. Hence, rejuvenators which can be considered as modifiers of aged binder can be blended with RAP during hot mixing to restore the binder properties. Rejuvenators such as waste engine oil (WEO) and waste cooking oil (WCO) are adopted in the study to check the structural and functional contribution of reusing binder. Chemical analysis includes Fourier Transform Infrared Spectroscopy (FTIR) to find the aging indices and rheological analysis includes dynamic Shear Rheometer to compare the complex shear modulus (G*) and phase angle (δ) for predicting fatigue and rutting behavior. Based on the test results WCO is found effective in restoring physical properties, in rheological properties RAP binder modified with rejuvenators are found comparable to VG 30. Wed, 10 May 2023 00:00:00 GMT http://210.212.227.212:8080/xmlui/handle/123456789/449 2023-05-10T00:00:00Z http://210.212.227.212:8080/xmlui/handle/123456789/448 EVALUATION OF MODE CHOICE BEHAVIOUR AMONG STUDENTS FOR SCHOOL-BASED TRIPS-A CASE STUDY FOR Shahnaz, Beegum.S; Karthik, S Research on children's school travel behavior has grown tremendously in the last decade. Millions of children travel to school in India every day, yet little is known about the journey. In this study, she investigated the distribution and determinants of school travel in the city of Kollam, India. For the pilot study, a total of 54 questionnaires were distributed to students and asked to fill them out. We also ask parents of elementary school children to fill out the form. A multinomial logit framework was used to model school trip selection decisions. The findings of the pilot study revealed that (70%) of the students do not prefer the school bus for school trip purposes. Only 30% of students prefer the school bus. The majority (48%) of students lived within a radius of more than 5 km from the school and 16% lived within a radius of 1 km. Most children (26%) prefer a car for school trips. 16% of children walked to school and 48% of children cycled. In order to attract children to use public transport or school buses, there is an urgent need to address the factors that make people reluctant to use school buses and to improve the road infrastructure around school to increase active travel among children. Tue, 29 Nov 2022 00:00:00 GMT http://210.212.227.212:8080/xmlui/handle/123456789/448 2022-11-29T00:00:00Z http://210.212.227.212:8080/xmlui/handle/123456789/447 INVESTIGATION OF IMPACTS OF CASTOR OIL AS A REJUVENATOR ON RECYCLED ASPHALT PAVEMENT Sandra, R S; Meenu, Tomson The use of recycled asphalt pavement in road construction sector is limited due to its poor cracking performance. Application of rejuvenator is an emerging solution for regaining the lost properties of RAP. Prior research mainly deals with chemical rejuvenators which are unsustainable and sometimes carcinogenic. The usage of oil-based organic rejuvenators causes higher softening effects on pavement and thereby reduce the load carrying capacity. This study deals with this gap by evaluating the impacts of castor oil as a rejuvenator on the performance of binder and mixtures containing 30% and 60% RAP materials. The physical and rheological properties of binder were studied by conventional tests and dynamic shear rheometer test respectively. The volumetric properties of mixtures were evaluated by Marshall, Indirect tensile strength test and Self-healing capacity test. The findings revealed that, the physical properties could regain with the addition of 5% and 8% castor oil to the RAP binder. The rutting parameter of both rejuvenated RAP binder with optimum castor oil were higher than that of virgin binder while the fatigue parameter was reduced that of virgin binder. This ensure that the rheological parameters could enhances by the addition of castor oil. The mechanical properties and self-healing capacity of rejuvenated RAP mixtures were enhanced in comparison to the control mixture. In summary, the usage of RAP with optimum castor oil in mixtures show promising outcomes and there by ensure the sustainable development practices in the future. Wed, 10 May 2023 00:00:00 GMT http://210.212.227.212:8080/xmlui/handle/123456789/447 2023-05-10T00:00:00Z