48 research outputs found
Study on Physicochemical Properties and its Effective Use of Asphalt Pavement Cutting Waste Water
No full textAbstractWhile cutting asphalt pavement surfaces, cooling water is continuously given to the cutting machine blades to prevent the heat increase and to control the scatter of cutting dusts. As the results, asphalt pavement cutting waste water is generated. The amount of waste water generated at one construction site is by no means a lot, however, the water quality is not environmentally friendly. In view of above, the physical and chemical properties of cutting waste water were first investigated. Then the possibility of effective use of the cutting waste water was investigated using flocculants and granulation technique. The results show that the waste water quality can be improved by the effects of flocculants. Mud sediments after flocculated in the waste water can be granulated and the granules may be used as recycled sands or recycle crusher-runs aggregates
Variation of the Groundwater Table within Indian Railway Embankments in Consideration of Climate Change
No full textClimatic changes have intensified heavy rainfall events in India, causing daily downpours from 156 to 594 mm, and these are expected to worsen in the future. This study analyses a double-line railway embankment using transient unsaturated–saturated seepage analysis through numerical modeling to examine the impact of rainfall scenarios, embankment height, initial groundwater table position, and soil water characteristics curves (SWCCs) of subgrade and subsoil. Our findings indicate an increased vulnerability of embankments to future rainfall due to rapid increases in the groundwater level, necessitating the requirement to make railway embankments resilient to climate change and thereby offering a sustainable mode of transportation. The groundwater onset mechanism across different heights remained consistent; rainwater infiltrated through side slopes first, rose near the toe, and then flowed horizontally, leading to convergence. The convergence level is affected by the SWCCs; however, a single normalized convergence plot can be created by presuming the horizontal flow of the infiltrated water through embankment and subsoil, irrespective of the material type, establishing horizontal flow as the principal convergence mechanism. In embankments over low-permeability subsoil, extremely heavy rainfall creates a unique pattern: side slopes and the top saturate early, while the saturation of the bottom central part is delayed. In such cases, deriving a groundwater variation curve might be challenging
Strength Variance within Cement Treated Soils Induced by Newly Developed Pneumatic Flow Mixing Method
No full textA New Granulation Method with the Process of Crumbling Partially-cemented Liquid Muds and its Application to a Motocross Track
No full textAbstractA new method for granulating liquid muds was proposed. This method involves the crumbling of partially cemented muds. The crumbling is the re-stirring of the cement–mud mixture when certain time elapsed after the cement was added to the liquid muds. Laboratory experiments revealed that the cone indices of the cement-mud mixtures measured after they are primary cured can be used to control the possibility of granulation and the particle size of granules obtained. The test results also indicate that the granules show high potential for use in materials such as reclamation, subgrade or backfill materials. The application of this crumbling granulation method in the maintenance work of a motocross track was also presented in this study
Fundamental Study on the Effect of CO2 Curing on the Strength Development of Alkaline Construction Sludge
No full textCentrifuge Model Tests on Dynamic Behavior of Quay Wall Backfilled with Granulated Cement-Treated Soil
No full textPhysical and mechanical properties of cement-treated granular soils with respect to geotechnical application
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Investigation on Static Stability of Sheet Pile Quay Wall Improved by Cement Treated Sea-Side Ground from Centrifuge Model Tests
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