Recycled Technology of Urban Road Construction Waste and Miscellaneous Fill Used as Subgrade Fillings

2011 ◽  
Vol 250-253 ◽  
pp. 3460-3464 ◽  
Author(s):  
Bing Kang Liu ◽  
Jin Song Fan ◽  
Hui Min Hu ◽  
Li Hui Fu
Keyword(s):  
Road Construction ◽  
Field Investigation ◽  
Environment Friendly ◽  
Soil Resource ◽  
Construction Waste ◽  
Urban Road ◽  
Treatment Techniques ◽  
Cold Recycling ◽  
Engineering Projects ◽  
Typical Soil

Continuously increasing municipal renovation and roadbed excavation produced a considerable quantity of solid waste each year such us miscellaneous fill mixed with broken pavement fragments and brickbats, which resulted in a series of urban environment and soil resource issues. Comprehensive recycling technology for soil modification to attain the strength requirements of subgrade fillings from the related road construction codes is necessary and even urgent, since the usual soil replacement is not the economic and environment-friendly method. The field investigation and laboratorial tests hereby had been completed to confirm the application potentials of typical soil specimens selected from different locations. The experimental results indicate some of specimens can be reused as subgrade fillings in road construction immediately and others should be treated by soil amelioration. To further certify the practicality of this recycled technology and broaden its range of application, three typical reutilization and treatment techniques, cold recycling, soil solidification and dynamic consolidation are introduced into engineering projects.

scholarly journals Common Problems and Design Methods of Urban Municipal Road Design

2017 ◽  
Vol 6 (2) ◽  
Author(s):  
Jiayi Miao
Keyword(s):  
Social Life ◽  
Driving Force ◽  
Rapid Development ◽  
Road Construction ◽  
Urban Infrastructure ◽  
Urban Transport ◽  
Urban Road ◽  
Road Design ◽  
Common Problems ◽  
China’S Economy

With the rapid development of China's economy, the construction scale of urban transport is also expanding. Among them, municipal road construction is an important part of urban infrastructure as well as an important guarantee for the development of people's livelihood; it is also an important driving force to promote urban transport system and social life development. The author expounds the importance and basic requirements of urban road designing, and discusses some common problems and countermeasures, hoping to be helpful.

scholarly journals Research and Analysis on the Principle in Plant Cold Recycling for Foamed Bitumen and Mixture Performance

2021 ◽  
Vol 4 (6) ◽  
Author(s):  
Zecheng Ni ◽  
Shijing Chen ◽  
Yihuan Li ◽  
Hongxi Peng ◽  
Jiawen Liang ◽  
...  
Keyword(s):  
Asphalt Concrete ◽  
Asphalt Pavement ◽  
External Factors ◽  
Asphalt Pavements ◽  
Huge Amount ◽  
Construction Waste ◽  
The Road ◽  
Road Performance ◽  
Foamed Bitumen ◽  
Cold Recycling

The early asphalt pavement in our country severely reduced the road performance due to various external factors during the use process. According to incomplete statistics, there are more asphalt pavements that need to be renovated and repaired every year in China, and the amount of construction waste such as asphalt concrete and other construction waste reaches 1,000. About ten thousand tons. If such a huge amount of construction waste is not used, it will inevitably cause great pollution to the environment. If it can be reused, not only will it be environmentally friendly and energy-saving, it will also save more than one billion yuan in costs. In view of the above problems, this article conducts related Research and Analysis on the Principle in Plant Cold Recycling for Foamed Bitumen and Mixture Performance to provide reference for future projects.

scholarly journals Study of the Stiffness of the Bitumen Emulsion Based Cold Recycling Mixes for Road Base Courses

Materials ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 5473
Author(s):  
Katarzyna Konieczna ◽  
Piotr Pokorski ◽  
Wojciech Sorociak ◽  
Piotr Radziszewski ◽  
Dawid Żymełka ◽  
...  
Keyword(s):  
Road Construction ◽  
Reclaimed Asphalt Pavement ◽  
Stiffness Modulus ◽  
Pavement Rehabilitation ◽  
Reclaimed Asphalt ◽  
Bitumen Emulsion ◽  
Potential Benefits ◽  
Indirect Tensile ◽  
Reduction Of Energy Consumption ◽  
Cold Recycling

The benefits of the use of cold recycling mixtures (CRMs) in pavement rehabilitation are associated with both the reduction of natural resource consumption by replacing them with recycled materials and the reduction of energy consumption during their production and paving. The evolution of the stiffness of CRMs in road construction and the fatigue life of pavements with CRM base layers are still being investigated. In this paper, CRMs with 1% cement content, called bitumen-stabilized materials with bitumen emulsion (BSM-Es), were examined. Mixtures that were differentiated in terms of Reclaimed Asphalt Pavement (RAP) content, as well as the amount and type of bitumen emulsions, were subjected to indirect tensile stiffness modulus (ITSM) tests at 5 °C, 13 °C, and 20 °C. The thermal sensitivities of the BSM-E mixtures were analyzed. BSM-E mixture stiffness modulus levels at various temperatures were determined using a statistical approach. On the basis of the results obtained, a discussion on the mechanistic-empirical design of flexible pavements with BSM-E base layers is presented. The potential benefits of using BSM-E materials in road construction in certain aspects of pavement life are indicated.

Evaluation of habitat fragmentation of giant panda (Ailuropoda melanoleuca) on the north slopes of Daxiangling Mountains, Sichuan province, China

2007 ◽  
Vol 57 (4) ◽  
pp. 485-500 ◽  
Author(s):  
Dunwu Qi ◽  
Zhonghai Tang ◽  
Wenguang Zhang ◽  
Bingyao Chen ◽  
Jinchu Hu ◽  
...  
Keyword(s):  
Human Activities ◽  
Giant Panda ◽  
Nature Reserve ◽  
Road Construction ◽  
Field Investigation ◽  
Sichuan Province ◽  
Ailuropoda Melanoleuca ◽  
The North ◽  
Global Biodiversity ◽  
Hydropower Stations

AbstractHuman activities have been a main cause of floral and faunal species extinction and loss of local and global biodiversity. Habitat and population can become fragmented and isolated under anthropogenic disturbances. In this study, we focus on the effect of human activities on the habitat and population of the giant panda (Ailuropoda melanoleuca) in the north slopes of Daxiangling Mountains, Sichuan province, China. Based on eight months of field investigation in 2004, we found that the distribution of the giant panda population has been limited to remnants of habitat due to human activities such as road construction, mining and hydropower stations. There is 100.60 km2 area suitable for the giant panda (including moderately suitable, suitable and most suitable), which only accounts for 21.33% of the bamboo area. Based on a dispersal model COST, there were 79.94 km2 areas (17.12%) (including moderately suitable, suitable and most suitable) for giant panda utilization in reality. Only 16.35 km2 areas (3.5%) of total bamboo area were most suitable. The areas that suitable for panda had decreased 20.66 km2 from 2000 in total due to people activities. The results of this study can be used to provide basic information to build nature reserve for protecting giant panda in Daxiangling Mountains.

Comparison of Principal Factors between China Actual Environmental Risk (CAER) and China Zero Environmental Risk (CZER): Project Angle

2012 ◽  
Vol 550-553 ◽  
pp. 2263-2269
Author(s):  
Chang Qing Liu
Keyword(s):  
Waste Disposal ◽  
Environmental Risk ◽  
Construction Projects ◽  
Chemical Engineering ◽  
Environment Friendly ◽  
General Management ◽  
Energy Projects ◽  
Principal Factors ◽  
Public Construction ◽  
Engineering Projects

Studies on comparison of principal factors between CAER (China Actual Environmental Risk) and CZER (China Zero Environmental Risk) from Project Angle are seldom found, so we studied the theme above in this thesis. By analysis, we have known that on one hand, there are such aspects in common as projects for resources excavation, and refinement, etc., projects for primary industries, other non-living projects, waste disposal, and general management between CAER and CZER. On the other hand, they are different in such aspects as chemical engineering projects and living projects only for CAER, and energy projects and public construction projects only for CZER. And our related advice is as follows: first, strict management on production of waste from such projects as public construction projects, resources excavation and refinement, natural resources, projects for primary industries, and other non-living projects. Secondly great encouragement to environment-friendly technological innovations in waste disposal, etc..

Reinforcement Mechanism of Cement/Lime-Fly Ash Treated Sediments as Road Construction Materials

2011 ◽  
Vol 99-100 ◽  
pp. 924-927 ◽  
Author(s):  
Dong Xing Wang ◽  
Hong Xing Wang ◽  
Wen Zhao Chen
Keyword(s):  
Fly Ash ◽  
Mechanical Performance ◽  
Construction Materials ◽  
Road Construction ◽  
Strength Test ◽  
Point Of View ◽  
Environment Friendly ◽  
Reinforcement Mechanism ◽  
Dredged Materials ◽  
Compressive Strength Test

Solidified dredged materials as environment-friendly materials in construction domain are increasingly popular because of their better mechanical performance and low pollution. Based on the physical characteristic of dredged marine sediments, a series of tests, such as unconfined compressive strength test and tensile strength test, were performed to explore the mechanical properties of cement/lime-fly ash treated sediments for the beneficial use in road construction. Finally, the reinforcement mechanism of solidified sediments was explored by SEM tests from the point of view of the formation of CSH phases and the change in microstructure.

scholarly journals Influence of Milled Material and Construction Waste on the Properties of a Typical Soil of Iranduba City - AM / BR

2019 ◽  
Vol 7 (12) ◽  
pp. 348-355
Author(s):  
Marcos Raiker Printes Ferreira ◽  
David Barbosa de Alencar ◽  
Felipe Wilson Leão da Silva ◽  
Fábio Martins da Silva ◽  
Consuelo Alves da Frota
Keyword(s):  
Construction And Demolition Waste ◽  
Natural Soil ◽  
Technical Solution ◽  
Demolition Waste ◽  
Construction Waste ◽  
Milled Material ◽  
Stone Material ◽  
Selection Parameters ◽  
The City ◽  
Typical Soil

The lack of stone material in the State of Amazonas and the possibility of using solid waste in the sublayers of pavements motivates the work in question, notably with the purpose of contributing as an alternative technical solution to the paving of the city of Iranduba / AM / BR. Compositions of soil mixed with waste from milled material (MM) and construction and demolition (CDW) were studied. The materials participating in the formulations were physically characterized, as well as the mechanical behavior of the natural soil (NS) and mixtures of soil-20% milled material (NS + 20MM) and soil-20% construction and demolition waste were determined. (NS + 20CDW). The results showed that the compositions with the participation of the milled material were the most efficient relative to the mixtures with the presence of the construction and demolition residue. It is noteworthy that both formulations, referring to natural soil, improved the expansion and presented an increase in the California Bearing Ratio, selection parameters for application in the base and subfloor layers.

scholarly journals Impact of July 2004 high-intensity rain on Hilepani-Jayaramghat-Diktel Environment-Friendly Road in East Nepal

2006 ◽  
Vol 34 ◽  
pp. 81-94
Author(s):  
Megh Raj Dhital
Keyword(s):  
High Intensity ◽  
Road Construction ◽  
Retaining Walls ◽  
Bare Soil ◽  
Cut Slope ◽  
Severe Damage ◽  
Environment Friendly ◽  
The Road ◽  
Gabion Walls ◽  
Cut Slopes

The high-intensity rain of 5-13 July 2004 activated numerous landslides, gullies, and debris flows in the watershed of the Dudh Koshi River in east Nepal. As a result, the Hilepani- Jayaramghat- Diktel Environment-Friendly Road was devastated. Apart from the rainfall, geological, geomorphic, land use, and road construction practices were other important factors leading to the disaster. Most of the damage was concentrated on concave slopes, whereas the ridges and convex slopes were relatively safe. The entire alignment was devoid of any breast or retaining walls necessary to protect the high, steep, and bare soil cut slopes, and it resulted in extensive cut slope failures. Similarly, side and cross drains were almost nonexistent. As a result, severe damage was seen at almost every gully crossing. There were very few gully protection structures (viz. check dams) and, like the retaining walls constructed below the road, they also suffered from poor construction quality and failed due to weak foundation and inadequate keying practices. Some of the most awkward structures were the loops founded on unstable slopes with high (up to 15 m) and robust gabion walls at the bends, and deep box cuts above them. In these circumstances, the concentrated runoff and subsequent debris flow from the box cut devastated the entire hairpin bend.

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