
Ken KawamotoSaitama University · Graduate School of Science and Engineering
Ken Kawamoto
Doctor of Philosophy
About
257
Publications
72,632
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
3,327
Citations
Introduction
Skills and Expertise
Additional affiliations
April 1996 - present
Publications
Publications (257)
Understanding of hydraulic properties is necessary to evaluate the water infiltration and balance in a road course. An easily available hydraulic model can contribute to the design of urban flooding countermeasures and mitigation of urban heat islands by covering roads with pavements. Many studies have evaluated saturated hydraulic conductivity, bu...
Anaerobic filter (AF) is commonly applied in the treatment of landfill-leachate and one major drawback is the usage of expensive packing media. Hence, investigations on the applicability of low-cost materials as efficient packing materials in anaerobic filters are timely and crucial. Thus, the present study was focused on assessing the applicabilit...
With the increased use of autoclaved aerated concrete (AAC) in the construction sector, the generation of AAC scrap is increasing in plant manufacturing and construction demolition works, but its reuse and recycling is limited compared to other typical construction wastes such as concrete and asphalt. To examine the use of AAC scrap for roadbed mat...
The main aim of this study is to investigate the material and monetary flows of CDW management and to characterize the distribution of illegally dumped CDW in Hanoi. Construction and demolition waste management has become a source of much concern to the urban authorities and citizens of big cities in Vietnam. It is estimated that 3000 t of CDW were...
Roadbed materials of base and subbase layers are frequently unsaturated caused by rainfall, drainage, and evaporation. However, the movement of water in these layers is still poorly understood because of lacking data on unsaturated properties such as the water retention curve (WRC) and unsaturated hydraulic conductivity ( K ). This study, therefore...
This study conducted a survey at 15 building construction and demolition sites in Hanoi, Vietnam in order to identify waste generation rates (WGR), composition, and current handling practices of construction and demolition waste (CDW). Waste quantification based on CDW layout, image analysis to identify CDW components, and face-to-face interviews w...
Due to rapid industrialization and economic growth, the generation of construction and demolition waste (CDW) from the activities of demolishing buildings is increasing in Vietnam. The Vietnamese Government has regulations on recycling and collecting CDW for reuse, recycling to environmental protection through Circular No. 08/2017/TT-BXD in 2017, a...
The discharge of untreated oily wastewater into the environment has serious impacts on human health, living nature, and ecosystems and leads to significant economic losses. Many engineering techniques have been proposed and applied to treat oily wastewater, but limited studies have investigated low-cost and effective techniques using by-products an...
Based on the experience of Japan and other developed countries, the aims of solid
waste management can be divided generally into three phases: 1) solving public
health issues, 2) solving pollution and environmental issues caused by final disposal
sites, and 3) establishment of sound material-cycle society. Japan has been
implementing these phases o...
Citation: Hanh, P.T.H.; Phoungthong, K.; Chantrapromma, S.; Choto, P.; Thanomsilp, C.; Siriwat, P.; Wisittipanit, N.; Suwunwong, T. Abstract: In recent years, the contamination of the aquatic environment with antibiotics, including tetracyclines, has drawn much attention. Bottom ash (BA), a residue from the biomass power plant, was used to synthesi...
Treatment of oily wastewater has been still a challenge to environmental scientists. In this study, waste autoclaved aerated concrete (AAC) grains from a concrete manufacturing plant were collected and modified with stearic acid to evaluate the possibility of using them as low-cost filtration media for the removal of oil from water. The modificatio...
Granulated bentonite mixtures (GBMs) have been regarded as effective buffer materials in the deep geological disposal of radioactive waste due to their operational advantages, such as ease of transportation and in-situ placement/backfilling. Many studies have been done to characterize the hydraulic and thermal properties of GBMs as well as their sw...
Acidic soils can induce several negative impacts, especially in agricultural fields. To address these problems, lime is often applied to increase the pH value of acidic soils. Calcium carbonate is the most common and conventional agricultural lime; however, it is a natural and scarce resource. To promote a recycling-based society, alternative neutr...
Separation of oil and water is an effective technique to treat oily wastewater. For examining the applicability of porous grains coated with hydrophobic agents (HA) as low-cost and easily available filtration and adsorbent materials in the separation of oil and water, this study assessed the hydrophobicity/oleophilicity of porous grains made from a...
Along with economic development, urbanization will generate a large amount of solid waste and put pressure on the waste management systems in developing countries. Face-to-face interview methods were used to investigate the current status of construction and demolition waste (CDW) management (collection, transportation, treatment, and storage) as w...
In Vietnam, an increase in construction activities together with the absence of recycling-oriented demolition techniques is giving rise to an alarming generation of construction and demolition waste. This study scrutinized the current state of building demolition approaches in Hanoi, Vietnam and evaluated the potential for the selective dismantling...
Road base layers play an important role in bearing, transmitting, and distributing part of the load to the underground.
Unbound aggregates crushed from natural rock are the most popular materials used to construct the base layers of the
pavements. However, nowadays the sources of natural materials have been increasingly exhausted and the pollution...
Reuse and recycling of non-hazardous construction and demolition waste and industrial byproducts
in the construction industry is vital to promote environmentally sound waste management. In particular, the
effective utilization of sludge and waste clay bricks is greatly required in developing countries. This paper studied
compaction characteristics...
Natural granular materials widely used in building and infrastructure development consume a considerable number of natural resources. To avoid depleting natural granular materials, recycled concrete aggregates (RCA) from construction and demolition waste are now commonly used as an alternative. The mechanical behavior of RCA used in road constructi...
The construction industry is one of the key industries with high potential for the circular economy; the promotion of reuse and recycling of construction and demolition waste (CDW) is essential for sustainable urban development. In this study, a series of compaction, California bearing ratio, saturated hydraulic conductivity, and particle breakage...
Due to the rapid increase in population and urbanization, municipal solid waste (MSW) generation is increasing. Sri Lanka, in particular, faces serious difficulties in finding new sites for MSW disposal, due to the lack of available space; therefore, the rehabilitation of existing MSW dumping sites and the extension of their services are required t...
The paper presents experimental results and structural analysis of reinforced concrete (RC) columns made of recycled aggregate concrete (RAC) and natural aggregate concrete (NAC) under concentric compressive load. The ratio of recycled aggregates in mixture (i.e, replacement ratio, r in %) was 0, 50, and 100% by mass, where r = 0% corresponding to...
Cool road pavements contribute to mitigating urban heat islands. To evaluate the heat balance in paved surfaces and to select appropriate road construction materials that help suppress heat islands, an accurate understanding of heat transport parameters such as thermal conductivity (λ) and heat capacity (HC) is important. Recycled aggregates from c...
Cr(III) adsorption from textile industrial effluent was studied with the aim of contributing towards achieving targets of SDG 6 (Sustainable Development Goals). Highly toxic effluent discharge from textile industries cause the majority of the pollution of waterways which is due to the unaffordability of the existing effluent treatment techniques. P...
Not only characterization of saturated hydraulic property but also unsaturated hydraulic properties such as water retention and unsaturated hydraulic conductivity are necessary to evaluate an accurate water movement process and the design of water drainage in the road pavement system. Till now, only limited data is available for the unsaturated hyd...
Oily wastewater is produced by the rapid urbanization, industrialization and economic growth in developing countries. At present, many oily wastewater treatment practices such as flotation, chemical coagulation, adsorption, filtration and membrane separation are available. Among them, oil/water separation techniques using natural hydrophobic/oleoph...
With the rapid development of the construction industry, construction and demolition waste (CDW) is causing many negative impacts to the economy, society, and environment in Vietnam. This is due to common treatment methods such as landfilling and/or improper dumping into the environment. Therefore, the promotion of CDW recycling and investment in C...
Construction demolition waste (CDW) has become a great concern in all over the world, especially in rapid developing countries including Vietnam. The improper management of CDW gives negative impacts on environment and economy. Vietnam government has recently introduced a series of legal framework including an amended environmental protection law,...
Mechanical properties of recycled concrete aggregates (RCA) such as compaction and California bearing ratio (CBR) are important for application as unbound road base and subbase materials. Limited studies, however, have examined the effects of the nominal maximum particle diameter (Dmax) of aggregates and fines content (Fc; < 0.075 mm). Also, partic...
This study investigated the simultaneous removal of Cd2+ and Pb2+ from wastewater using commercially available Japanese zeolite (JPZ) and its mixtures. A series of batch adsorption experiments were carried out to examine the simultaneous removal of Cd2+ and Pb2+ in binary and multi-metal solutions. Results revealed that JPZ (0.105–2.0 mm) exhibited...
Road base layers play an important role in bearing, transmitting, and distributing part of the load to the underground. Unbound aggregates crushed from natural rock are the most popular materials used to construct the base layers of the pavements. However, nowadays the sources of natural materials have been increasingly exhausted and the pollution...
Untreated oil-contaminated water discharge from domestic and industrial sources has led to serious environmental pollution, especially in developing countries. Many technologies (e.g., floatation and coagulation, biological treatment, membrane separation, and so on) have been developed to treat effluents. Among them, the oil-water separation utiliz...
Groundwater has been used as the main source of water supply in Hanoi City for more than a century. At present, 623,500 cubic meter of groundwater have been providing per day for urban districts. In recent years, groundwater pollution due to arsenic (As), iron (Fe), ammonia (NH3), and organic matters (OM) has been reported. This paper presents a re...
Solid waste management causes a significant challenge for the developing countries, especially in Vietnam. While the construction industry has enjoyed continuous development, huge amounts of construction and demolition waste (CDW) being generated and dumped illegally on the vacant areas including roadsides, streets, and canals occur frequently. The...
Bentonite is often considered as one of the key components of the Engineered Barrier System (EBS) for the radioactive waste disposal; mechanical, thermal, and hydraulic behaviors of bentonite should be thoroughly studied to ensure the emplaced the quality and to control the performance of EBS. This study examined the effects of dry density and rela...
This study investigated the applicability of industrial by-products such as steel slag (SS) and autoclaved aerated concrete (AAC) grains (<0.105, 0.105–2, 2–4.75 mm) as low-cost adsorbents for simultaneous removal of Cd2+ and Pb2+ in wastewater. A series of batch adsorption experiments was carried out in single and binary-metal solutions of Cd2+ an...
This study collected basic information and conducted waste composition surveys to identify the present management condition of construction and demolition waste (CDW) landfills in Hanoi of Vietnam and to characterize waste composition and grain size distribution of CDW dumped at landfills. Basic information on seven CDW landfills under operation or...
Temperature dependence of soil CO2 flux and CO2 production and consumption were investigated in the vadose zone of Arakawa Lowland in the Tokyo Metropolitan area of Japan. Investigations were based on the combined techniques of a closed chamber method for measuring CO2 emission, frequent monitoring of the soil CO2 concentration profile through the...
Increasing waste generation and the absence of a formal recycling industry are exacerbating the inadequacy of Construction and Demolition Waste (CDW) management in Hanoi, Vietnam. This study assesses potential CDW recycling in Hanoi by estimating the prospective supply of and demand for CDW recycling plants and evaluating their likely costs and ben...
Low-Voltage Mineral Deposition technology (LVMD), widely known as Biorock, has previously been suggested as support for coral reef restoration, as hypothesized high porosity, wide pore-size distribution and connectivity, and good strength properties may facilitate biological functions (for example larvae settlement) and durability. In this technolo...
Bentonite has long been considered as a potential sealing material in engineered barrier systems (EBS) for the geological disposal of radioactive waste due to its favorable physical and chemical properties. In some disposal concepts, the research evolution has led to the adaption of granulated bentonite mixtures (GBM) as a candidate buffer/backfill...
Gas transport parameters such as gas diffusivity (Dp/D0), air permeability (ka), and their dependency on void space (air-filled porosity, ε) in a waste body govern convective air and gas diffusion at solid waste dumpsites and surface emission of various gases generated by microbial processes under aerobic and anaerobic decompositions. In this study...
The improper treatment of landfill leachates is one of the major problems associated with waste landfilling and causes serious environmental pollution at waste landfill sites and their surroundings. To develop a suitable landfill leachate treatment system and to minimize the risk of environmental pollution, it is important to characterize seasonal...
Mass transport within porous media is governed by their pore networks, which is highly influenced by pore structure parameters such as pore size distribution, porosity, pore tortuosity and pore coordination number. Micro-focus X-ray computed tomography (MFXCT) has emerged as a powerful non-destructive tool for the direct visualization and better un...
Construction and rehabilitation of roads demand a large volume of crushed rock which is used in granular layers of the road pavement. If recycled concrete aggregates which are extracted from construction and demolition waste satisfy all the engineering aspects of the material, then their use not only reduces the depletion of natural resources but a...
Cr(III) adsorption from textile industrial effluent was studied with the aim of contributing towards achieving targets of SDG 6 (Sustainable Development Goals). Highly toxic effluent discharge from textile industries cause the majority of the pollution of waterways which is due to the unaffordability of the existing effluent treatment techniques. P...
This study conducted a survey at 15 building construction and demolition sites in Hanoi, Vietnam in order to identify waste generation rates (WGR), composition, and current handling practices of construction and demolition waste (CDW). Waste quantification based on CDW layout, image analysis to identify CDW components, and face-to-face interviews w...
As a developing country in the context of globalization, Vietnam is experiencing a boom in its economy, characterized by a rapid rate of urbanization nationwide. Together with its benefits, this process also puts pressure on the environment, among which the increasing generation of construction and demolition waste (CDW) is an urgent issue. In this...
Adsorption is one of the highly efficient methods to treat heavy metals in wastewater. Due to their economic feasibility, the use of locally available low-cost adsorbents has received much attention, especially in developing countries. The objective of this study was to investigate the applicability of laterite grains made from crushing laterite br...
This study introduces the series of activities and results that are contributing for the CDW recycling industry in Vietnam especially for the implementation of the recently introduced Circular No.08/2017/TT-BXD. The equation for estimation of the amount of CDW generated from building demolition was introduced. New management regulations which are g...
Construction and Demolition Waste (CDW) has been being accounted for a large amount of waste in urban areas around the world, especially for developing countries like Vietnam due to rapid urbanization and economic growth. The recycling and reuse of CDW are not only significant in reducing the consumption of natural materials but also can be a solut...
Autoclaved aerated concrete (AAC) is a lightweight cementitious material that has a unique structure characterized by a robust skeleton and pores (porous medium). The internal pore network structure of AAC highly controls mechanical and mass transport properties. This study aimed to identify the pore network structure of AAC (typical meso- and macr...
Groundwater is essential for the Earth biosphere but is often contaminated by harmful chemical compounds due to both anthropogenic and natural causes. A key factor controlling the fate of harmful chemicals in groundwater is the reduction/oxidation (redox) conditions. The formation factors for the groundwater redox conditions are insufficiently unde...
With rapid urbanization and economic growth comes population growth and increasing amounts of waste generation, especially in big cities and industrial zones in Vietnam. Currently, there is no appropriate recycling or resource recover systems in place, not only for domestic waste but also for construction and demolition waste (CDW). In fact, most C...
Adsorption is one of cost-effective method to treat heavy metals in wastewater and the use of locally-available materials as adsorbents is receiving much attention especially in developing countries. This research was done to examine the potential use of laterite brick (from Vietnam) as a locally-available adsorbent to remove Chromium (Cr) and Arse...
Urbanization and industrialization, generating a huge amount of construction and demolition waste (CDW) and industrial by-products (IBPs) by triggering the pressure on the environment. Therefore, it is well-timed to give an added value for these waste materials in numerous ways. Thus, this study aims to set an added value for the selected CDW and I...
This study conducted a review of a wide array of documents related to construction and demolition waste (CDW) management in Southeast Asia (SEA). CDW definitions, current state of CDW generation and composition, CDW flow and institutional arrangements for CDW management were assessed. CDW generation was estimated in SEA countries where data are una...
Along with the increase of autoclaved aerated concrete (AAC) production, the amount of scrap waste (industrial by-products) is increasing. AAC waste, however, is not yet being fully reused or recycled and is discarded without any treatment in most developing countries. In this study, AAC fines were tested as effective and economic adsorbents for th...
Along with population growth, rapid urbanization, and industrialization, the generation of waste and industrial by-products is increasing enormously and causing many environmental and social issues. In order to examine effective applications of waste and industrial by-products, this study aimed to investigate the effective use of crushed waste clay...
Landfill sites are significant sources of greenhouse gases, particularly methane. It is believed that methane gas eruptions occur under a surface ponding condition during rainfall events. In this study, based on laboratory column experiments in which mixed gas was applied to variably compacted soil columns (10 cm in diameter and 30.5 cm in height)...
This study deals with Physico-chemical of groundwater and surface water in Pampaimadu in Vavuniya. Geological structure, poor sanitation, solid waste dumping and cultivation in this area have led surface and groundwater pollution with organic and inorganic substances through surface runoff, excessive irrigation and open grazing of cattle. The major...
Mass transport in soil occurs through the soil pore network, which is highly influenced by pore structural parameters such as pore-size distribution, porosity, pore tortuosity, and coordination number. In this study, we visualised the networks of meso- and macro-pores (typical pore radius r ≥ 10 μm) using microfocus X-ray computed tomography (MFXCT...
With rapid urbanization and economic growth on all fronts, much construction is conducted everywhere in Vietnam, especially in big cities such as Hanoi, Haiphong, and Ho Chi Minh. All these activities, new construction, renovation, and demolition of buildings and structures, generate huge amounts of waste, called construction and demolition waste (...
Permeable pavement system (PPS) has been widely used as urban stormwater management system and can be expected to reduce urban heat island effect. However, measurements of mass transport parameters for unsaturated road subbase materials are very limited. In this study, we measured water retention properties, gas transport parameters, and thermal pr...