Laboratory and Field Test Study on Fly Ash as Subgrade Filling

2010 ◽  
Vol 146-147 ◽  
pp. 859-864
Author(s):  
Huan Ling Wang ◽  
Miao He
Keyword(s):  
Fly Ash ◽  
Field Test ◽  
Low Cost ◽  
Construction Technology ◽  
Construction Process ◽  
The Road ◽  
Test Study ◽  
Wide Range ◽  
Road Performance ◽  
Gravel Pile

Fly ash has become increasingly wide range of applications in expressway as a new environment friendlymaterial, its range of applications are fromthe CFG( Cement Fly-ash Gravel) pile of soft ground、pavement admixture to embankment materials et al. Fly ash used in expressway has many advantages, such as, it can save farmland, has a small settlement after construction and low cost as a light embankment filling. In this paper, based on an expressway in Jiangsu province, the fly ash used as a subgrade filling, a series of fly ash laboratory and field test have been conducted. The construction technology, important construction parameters, construction process control and compaction quality assessment on fly ash have been analyzed on the basis of the tests result, the road performance and construction control key methods of fly ash obtained, which can guide scientific construction.

Research on the Disposal for Fly Ash Weak Foundation by Spraying Powder Pile

2011 ◽  
Vol 71-78 ◽  
pp. 3785-3788
Author(s):  
Jian Wei Zhang ◽  
Min Jie Zhu ◽  
Li Wei Zhang
Keyword(s):  
Fly Ash ◽  
Environmental Pollution ◽  
Low Cost ◽  
Limited Liability ◽  
Construction Technology ◽  
Limited Liability Company ◽  
Technical Application

This paper studies the technical application of the disposal for FA(fly ash) weak foundation of these abandoned fly ash pool by the construction technology of spraying powder pile, so that, not only these abandoned fly ash pool will be used effectively as soon as possible, but also the surrounding environmental pollution will be improved well. The construction technology of reinforcement weak foundation is efficient, low cost and no pollution. In order to argue it, this paper will discuss the mechanism and feasibility of the construction technology based on first phase project of Xinmei car limited liability company.

Test Study on Overdose Cement Stabilized Crushed Rock Base

2011 ◽  
Vol 415-417 ◽  
pp. 254-260 ◽  
Author(s):  
Yan Peng Lin ◽  
Jia Liu
Keyword(s):  
Asphalt Pavement ◽  
Low Cost ◽  
Base Material ◽  
Primary Stability ◽  
High Strength ◽  
Crushed Rock ◽  
Premature Failure ◽  
Soil Plasticity ◽  
The Road ◽  
Test Study

The early disease of semi-rigid asphalt pavement disease will seriously affect the quality and durability of road usage and the life of the road. Water into the pavement layer cause water content increases and the strength greatly reduced in primary or sub-base material which contends more soil and greater soil plasticity index. Resulting in premature failure of asphalt pavement, and the road surface rutting greater is the insufficient primary strength. The use of water overdose primary stability can fully play its high strength and low cost advantages, but also has a low shrinkage, minimize shrinkage cracks.

scholarly journals Development and Application of Skid Resistance Fog Seal for Pavements

Coatings ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 867
Author(s):  
Yingjun Jiang ◽  
Yong Yi ◽  
Tian Tian ◽  
Jiangtao Fan ◽  
Kejia Yuan ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Bond Strength ◽  
Skid Resistance ◽  
Construction Process ◽  
Water Penetration ◽  
The Road ◽  
Bond Performance ◽  
Aging Resistance ◽  
High Bond ◽  
Road Performance

The performance of a skid resistance fog seal is studied to develop a high bond performance road skid resistance fog seal. Accordingly, a fog seal is developed based on the bond strength, permeability, and aging resistance. To develop the skid resistance fog seal herein, the skid resistance particle types and dosages are optimized according to the skid and wear resistance properties. The fog seal performance is then verified. Furthermore, the road performance of the skid resistance fog seal is studied, and the optimal amount of the skid resistance fog seal is proposed. Finally, the influence of the construction process on the skid and wear resistance is investigated. The results show that the self-made skid resistance fog seal has better bond strength, permeability, and aging resistance. The 0.6 kg/m2 skid resistance fog seal exhibits the best skid and wear resistance and water penetration performance, while the skid resistance fog seal constructed by the premix process has the best skid and wear resistance properties.

Research and Experiment on the Road Performance of Scoria (Volcanic Ash)

2011 ◽  
Vol 243-249 ◽  
pp. 4101-4105
Author(s):  
Zhen Hua Fan
Keyword(s):  
Theoretical Basis ◽  
Volcanic Ash ◽  
Detection Method ◽  
Road Construction ◽  
Construction Technology ◽  
Engineering Property ◽  
The Road ◽  
Road Performance ◽  
On The Road ◽  
And Performance

According to the tests and researches, this paper combine the constructing condition of scoria (volcanic ash) subgrade and lime-volcanic ash gradation macadam subgrade and the result of investigation and detection after the test section is completed, the physicochemical property, engineering property, compaction mechanism and performance, formation mechanism and increasing rule of strength of scoria (volcanic ash) and lime-volcanic ash are systematically analyzed, propose the construction technology and detection method of scoria (volcanic ash) subgrade and lime-volcanic ash gradation macadam subgrade, provide technical support and theoretical basis for application of scoria (volcanic ash) on road construction.

scholarly journals Removal of cadmium from aqueous solutions using industrial coal fly ash-nZVI

2018 ◽  
Vol 5 (2) ◽  
pp. 171051 ◽  
Author(s):  
Lixia Ma ◽  
Qi Wei ◽  
Yueqin Chen ◽  
Qiuyang Song ◽  
Conghui Sun ◽  
...  
Keyword(s):  
Fly Ash ◽  
Low Cost ◽  
Coal Fly Ash ◽  
Zerovalent Iron ◽  
Solution Properties ◽  
Batch Experiments ◽  
Nanoscale Zerovalent Iron ◽  
Wide Range ◽  
Short Time ◽  
Cd Removal

Batch experiments were conducted to test the effects of various solution properties, such as pH, temperature, initial concentration and anoxic and aerobic atmosphere, on Cd removal by nanoscale zerovalent iron (nZVI) supported on industrial coal fly ash. Cd (II) could be removed by adsorption on fly ash-nZVI in a very short time (5 min) with high removal rates (greater than 99.9%) over a wide range of concentration (5–100 mg l −1 ). Cd (II) was physically adsorbed on the surface of fly ash-nZVI. The preparation of fly ash-nZVI can incorporate the use of waste media, making the overall adsorbent more removal efficient and low cost.

Indoor Study on Road Performance of Macromolecule Polymer Bitumen Waterproof and Cohesive Layer (PCMA)

2014 ◽  
Vol 912-914 ◽  
pp. 172-177 ◽  
Author(s):  
Da Wei Lv ◽  
Jian He ◽  
Xiao Li Sun
Keyword(s):  
Shear Strength ◽  
Bridge Deck ◽  
Bonding Layer ◽  
Construction Process ◽  
Modified Bitumen ◽  
Test Study ◽  
New Type ◽  
Road Performance ◽  
Bridge Deck Pavement

The quality of waterproof and cohesive layer determines the service life of bridge deck pavement. Conventional modified bitumen bonding layer exits some deficiencies that its shear strength is low, construction process is complexity and it need to spread gravel. In order to solve the problem, the new type of waterproof and cohesive layer called PCMA is developed and researched. Through the indoor test study on road performance of the PCMA, the results shows that PCMAs shear strength, drawing stress and fatigue life are significantly higher than other waterproof and cohesive layer. It is especially suitable for hot and humid regions.

Precise Single-Frequency Positioning Using Low-Cost Receiver with the Aid of Lane-Level Map Matching for Land Vehicle Navigation

2020 ◽  
pp. 1-14
Author(s):  
Fei Liu ◽  
Yue Liu ◽  
Zhixi Nie ◽  
Yang Gao
Keyword(s):  
Low Cost ◽  
Digital Camera ◽  
Satellite System ◽  
Single Frequency ◽  
Map Matching ◽  
Digital Map ◽  
The Road ◽  
Ambiguity Fixing ◽  
Wide Range ◽  
Global Navigation Satellite

Precise positioning with low-cost single-frequency global navigation satellite system (GNSS) receivers has great potential in a wide range of applications because of its low price and improved accuracy. However, challenges remain in achieving reliable and accurate solutions using low-cost receivers. For instance, the successful ambiguity fixing rate could be low for real-time kinematic (RTK) while large errors may occur in precise point positioning (PPP) in some scenarios (e.g., trees along the road). To solve the problems, this paper proposes a method with the aid of additional lane-level digital map information to improve the accuracy and reliability of RTK and PPP solutions. In the method, a digital camera will be applied for lane recognition and the positioning solution from a low-cost receiver will be projected to the digital map lane link. With the projected point position as a constraint, the RTK ambiguity fixing rate and PPP performance can be enhanced. A field kinematic test was conducted to verify the improvement of the RTK and PPP solutions with the aid of map matching. The results show that the RTK ambiguity fixing rate can be increased and the PPP positioning error can be reduced by map matching.

Road Performance Test and Application of TerraZyme Solidification Soil

2013 ◽  
Vol 295-298 ◽  
pp. 452-462
Author(s):  
Lan Gui ◽  
Yue Jun Li ◽  
Zeng Guang Li
Keyword(s):  
Performance Test ◽  
Construction Materials ◽  
Field Tests ◽  
Road Construction ◽  
Engineering Practice ◽  
Construction Technology ◽  
The Road ◽  
New Material ◽  
Road Performance ◽  
Modulus Of Resilience

TerraZyme is a completely different and new material for constructing road compared to the traditional road construction materials. Through the indoor and field tests of TerraZyme solidification soil, the road performance (e.g., unconfined compression strength, CBR value，modulus of resilience, hydraulic conductivity etc) of TerraZyme solidification soil was analyzed systematically. Meanwhile, the changing patterns in the case of various construction technology and different maintenance conditions were discussed. Then, the quality control index and measure for construction were presented. By validating the adaptability of TerraZyme solidification technology in engineering practice, it showed that the technology of TerraZyme solidification soil have many advantages such as no pollution, simple and convenient construction, higher solidified strength, good water stability and lower cost. Therefore, it can be broadly popularized and applied in the engineering practice.

Pavement Evaluation and Rehabilitation Design Methodology Currently Used on Low-Volume Roads in Southern Africa

2003 ◽  
Vol 1819 (1) ◽  
pp. 343-352 ◽  
Author(s):  
J. A. Grobler ◽  
A. Taute ◽  
I. Joubert
Keyword(s):  
Southern Africa ◽  
Design Methodology ◽  
Low Cost ◽  
Cost Effective ◽  
Past Performance ◽  
The Road ◽  
Low Volume Roads ◽  
Pavement Evaluation ◽  
Wide Range ◽  
Low Volume

A pavement evaluation and rehabilitation design methodology is currently employed in southern Africa on relatively light pavement structures used for low-volume roads. The pavements normally consist of natural gravel materials in most layers and thin bituminous surfacings. When nearing the end of their design lives, they exhibit distresses ranging from minor deformation through aging of the surface to structural cracking and potholes. Rehabilitation options normally involve light stone seals or other inexpensive and cost-effective treatments. The phases of investigation for pavement evaluation and rehabilitation designs start with desk study to establish the history of the road and its past performance from pavement management system outputs. Detailed visual evaluations are then conducted of road features and extent of various forms of distress. These data are presented followed by a decision-making process to select areas for more detailed testing. All the information is used to determine the causes of distress and likely rehabilitation alternatives. Further destructive and nondestructive testing is carried out to predict performance of rehabilitation designs and equivalent annual cost comparisons. Rehabilitation design is also done with use of the dynamic cone penetrometer. Decision criteria are set for use of tests undertaken in the assessments, and test results are evaluated. This procedure normally results in a wide range of rehabilitation options, from application of a diluted emulsion as a surface rejuvenator to more extensive patching and resealing to major rehabilitation and overlays. This process effectively produces cost-effective solutions that maximize limited budgets. It is essential that the road authority be prepared to share the risks of the low-cost options with the designer. In this way benefits of low-cost solutions are realized, whereas, in a limited number of instances, premature distress may have to be repaired under routine maintenance.

The low-cost hybrid sorbents for immoblization of dyes: sorbents features characterization

2020 ◽  
Author(s):  
Agnieszka Solińska ◽  
Tomasz Bajda
Keyword(s):  
Fly Ash ◽  
Clay Minerals ◽  
Low Cost ◽  
Energy Dispersive Spectrometer ◽  
Surface Charges ◽  
Sorption Behaviour ◽  
Novel Approach ◽  
Wide Range ◽  
Before And After ◽  
Eu Project

<p>The occurrence of dyes in wastewater is a threat for environment and living organisms. Therefore many studies have focused on investigation of diverse sorption materials to develop effective adsorption methods of removing these organic compounds (Yagub et al., 2014). Among the wide range of materials, the low-cost sorbents such as clay minerals, fly ash or lignite have received unflagging interest. However, the novel approach is to mix low-cost sorbents, clay minerals with fly ash or lignite, which could promote efficiency of removing chemically varied dyes and impact the modification of sorbent mixtures properties. Thus, the aim of this study is to investigate and compare features of hybrid sorbents: halloysite-fly ash, palygorskite-lignite before and after sorption reactions of selected dyes and evaluate influence of modified properties on their sorption mechanism. The obtained reactions’ products, as well as hybrid and selected raw sorbents after reactions, were studied by Fourier-transform infrared spectroscopy (FTIR), thermal analysis (DTA/TG) coupled with the measurement of evolved gases composition by mass spectrometer (QMS). The morphology of raw sorbents was analyzed by scanning electron microscopy (SEM) equipped with an energy dispersive spectrometer (EDS) for elemental microanalysis. The results show that sorbents features, especially the presence of organic functional groups, negative surface charges, have distinct impact on their sorption behaviour. Each componnent of hybrid sorbents affects the efficiency of dyes sorption. The obtained results revealed that mixing of various low-cost sorption materials may present unexpected properties.</p><p> </p><p>Acknowledgments.</p><p>The studies results have been presented with the partial financial support from the EU project of POWR.03.02.00-00-I038/16-00.</p><p>Literature:</p><p>Yagub M. T., Kanti Sen T., Afroze S., Ang H.M. (2014) Dye and its removal from aqueous solution by adsorption: A review, Advances in Colloid and Interface Science, 209, p. 172-184.</p>

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