scholarly journals Treatment of clay soils with steel slag, in road engineering

2020 ◽  
Vol 150 ◽  
pp. 02017
Author(s):  
Nizar Sebbar ◽  
Abdelaziz Lahmili ◽  
Lahcen Bahi ◽  
Latifa Ouadif
Keyword(s):  
Construction Industry ◽  
Circular Economy ◽  
Steel Industry ◽  
Steel Slag ◽  
Road Construction ◽  
Construction Sector ◽  
Road Engineering ◽  
The Road ◽  
Environmental Criteria ◽  
Public Laboratory

The road construction sector draws large quantities of materials every day to meet the needs of infrastructure networks. The main aim of the link between different regions is to facilitate the transport and connection of these agglomerations. With such a pace, a shortage of these materials is worsening by the day, causing an imbalance in our “ecosystem” on the way. All these factors and many others have raised the alarm among managers in the construction industry. Environmental organizations have since been constantly seeking palliative solutions to this global scourge. In addition, several industries generate a large amount of waste annually, in some cases recoverable while respecting certain technical and environmental criteria. It is in this environmental approach, embracing a philosophy of circular economy that multiple co-products (Slag, Fly Ash, Phosphogypsum, Silica Fume…etc.) have been tested and numerous studies have demonstrated their ability to be used as a substitute for natural resources. In this respect, the following article will focus, through studies conducted in public laboratory, on various mixtures of the "soil-slag" couple to assess their possible use in road engineering. First, an identification of the materials (soil from the Sidi Kacem region and slags from a steel industry) to be adopted in our analysis will be carried out, then we will proceed to Proctor/CBR tests on soil-slag mixtures, defined in advance in order to decide on the possibility of developing them in road engineering and thereby reduce the quantities in contribution of noble materials.

scholarly journals The Conjugated Triangle Method CTM of the detection of inconsistent bids in the construction industry

2018 ◽  
Vol 219 ◽  
pp. 04003 ◽  
Author(s):  
Hubert Anysz ◽  
Krzysztof Kaczorek
Keyword(s):  
Construction Industry ◽  
Road Construction ◽  
The Other ◽  
Construction Sector ◽  
The Public ◽  
The Road ◽  
Bid Price ◽  
Triangle Method ◽  
Two Parameters ◽  
Means Of Production

The existing system of bids evaluation in the construction industry does not bring the clients the certainty if all placed bids comprise real, achievable prices. Especially in the road construction sector, where the earthworks create significant part of the works, comparing e.g. the price of 1 km of roads often gives misleading results. The paper comprises the complete proposal to modify the scope of information provided by offerors in the public procurements (in the construction industry) allowing the clients to determine easily if the contractors have placed the consistent offers i.e. if the bid prices are not too high and if the lowest bid price is not a dumping price. The Conjugated Triangle Method (CTM) of inconsistent bid detection in construction industry is based on the three inter-related parameters: means of production, time of works, on the value of works. Regardless of the offered price it should match the other two parameters.

scholarly journals Recent trends of the emission characteristics from the road construction industry

2011 ◽  
Vol 19 (1) ◽  
pp. 301-301 ◽  
Author(s):  
Sippy K. Chauhan ◽  
Anuradha Shukla ◽  
S. Gangopadhyay ◽  
Sangita Sharma
Keyword(s):  
Construction Industry ◽  
Road Construction ◽  
Emission Characteristics ◽  
The Road ◽  
Recent Trends

Skidding Characteristics of Pavement Surfaces Incorporating Steel Slag Aggregates

1996 ◽  
Vol 1545 (1) ◽  
pp. 35-40 ◽  
Author(s):  
A. F. Stock ◽  
Colin M. Ibberson ◽  
I. F. Taylor
Keyword(s):  
Steel Industry ◽  
Steel Slag ◽  
Road Construction ◽  
Specimen Preparation ◽  
Skid Resistance ◽  
Performance Measurements ◽  
Performance Expectations ◽  
The Past ◽  
Set Up

Steel slag, a by-product of the steel industry, has been used in road construction in South Yorkshire and its environs for the past 60 years. Local highway engineers have anecdotal evidence of good long-term antiskid performance from road surfacings that incorporate steel slag aggregate, and these materials have remained popular with users. In view of the move toward performance measurements for paving materials, a systematic study of the performance of paving materials incorporating slag has been set up as a combined industry-university project with the assistance of the Teaching Company Directorate. The evaluation of the skid resistance characteristics of steel slag aggregates and the skidding characteristics of pavement surfaces incorporating steel slag aggregate are reported. The research program developed a modified specimen preparation procedure that significantly reduced the scatter in polished stone value (PSV) results. The field data showed that all steel slag surfaces provided good long-term skid resistance and that the 14-mm chippings exceed the performance expectations of rock chippings with similar PSVs.

scholarly journals Polish Transition towards Circular Economy: Materials Management and Implications for the Construction Sector

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5228 ◽  
Author(s):  
Justyna Tomaszewska
Keyword(s):  
Construction Industry ◽  
Circular Economy ◽  
Resource Depletion ◽  
Construction Sector ◽  
Materials Management ◽  
Future Directions ◽  
The Social ◽  
Eu Policies ◽  
Energy Consuming

Poland’s economy as the sixth largest economy in the EU is painfully experiencing the effects of natural resource depletion, which extend to increasing prices and the growing dependence on foreign suppliers. The situation is particularly unfavorable in the construction sector, which is among the most resource- and energy-consuming areas of the economy. This paper juxtaposes the situation of Polish construction industry in the context of the national economy with the context of the evolving EU policies promoting green solutions. The resulting changes in Polish legislation, industry and society are identified. The implementation of selected Circular Economy (CE) aspects, outcomes, emerging challenges and future directions are discussed. The social aspects related to this transformation were analyzed based on a survey carried out among construction industry consumers. The results clearly highlight that individuals are aware of the need to protect the environment, but also indicate a strong necessity to educate the populace about the consequences of the excessive exploitation of the environment and the long-term benefits of CE solutions.

scholarly journals Steel Slag as an Aggregate Replacement in Malaysian Hot Mix Asphalt

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
Mohd Rosli Hainin ◽  
Nur Izzi Md. Yusoff ◽  
Mohd Fahmi Mohammad Sabri ◽  
Mohd Azizi Abdul Aziz ◽  
Mohd Anwar Sahul Hameed ◽  
...  
Keyword(s):  
Steel Industry ◽  
Resilient Modulus ◽  
Steel Slag ◽  
Road Construction ◽  
Design System ◽  
High Demand ◽  
Asphalt Mixes ◽  
Alternative Materials ◽  
Crushed Aggregate ◽  
Pavement Construction

As natural aggregate sources are becoming depleted due to high demand in road construction and the amount of disposed waste material keeps increasing, researchers are exploring the use of alternative materials which could preserve natural sources and save the environment. In this study, steel slag was used as an aggregate replacement in conventional dense graded asphalt mixes (ACW14 and ACB28). Steel slag was selected due to its characteristics, which are almost similar to conventional aggregates, and the fact that it is easily obtainable as a by-product of the steel industry. The same gradations of mixtures were produced using normal crushed aggregate as control samples. The Marshall mix design system was used for sample preparation in accordance with Malaysian specifications. Samples of asphaltic concrete were subjected to the resilient modulus test, creep test and rutting test. Samples made from steel slag show significantly better results than conventional aggregate. Therefore, utilization of steel slag will reduce land fill, save natural resources and improve the strength of pavement to sustain a higher volume of vehicles. This will shift the gear in sustainable pavement construction, which is most desirable in today’s energy deficient world.

scholarly journals Investigation of Innovation during Bid Evaluation Process in the Road Construction Industry

2021 ◽  
Vol 7 (3) ◽  
pp. 594-613
Author(s):  
Pardeep Kumar Oad ◽  
Stephen Kajewski ◽  
Arun Kumar ◽  
Bo Xia
Keyword(s):  
Construction Industry ◽  
Road Construction ◽  
Evaluation Process ◽  
Value For Money ◽  
Bidding Strategies ◽  
The Road ◽  
Innovative Products ◽  
Private And Public ◽  
Bid Evaluation ◽  
Tender Evaluation

Tender evaluation is the procedure of choosing the best contractor for a particular project from many applicants. Although rational and logical methods can be used for bidding strategies, bid evaluation remains a skill for which an engineer’s verdict is crucial. Contractors commonly witness that tender selection is not an easy job, and the lowest bid does not necessarily win the contract. The tender decision mainly depends on quantifiable measures such as financial costs and paybacks, and qualitative or invisible factors like administrative security accountability, aptitude, and the proficiency of the contractors. Moreover, Bid evaluation is a decision-making procedure that incorporates an extensive criteria range for which the information is not accordingly. Hence, ambiguity linked to such information is not appropriate for this study. This paper aims to evaluate innovation during the bid evaluation process in the road industry. The research results indicate that the private and public sectors in Australia offer innovative products and work methods, given the chance. Therefore, innovation during the bid evaluation process is welcomed and sometimes strongly encouraged. Further, it is important to have strong research in to how to effectively determine value for money in the context of developing suitable and quality roads. Therefore, this research is useful in the context of evaluating factors that help to understand value for money in the road sector in context of bid evaluation process. Doi: 10.28991/cej-2021-03091676 Full Text: PDF

scholarly journals Evaluation of the Potential of Sasobit REDUX Additive to Lower Warm-Mix Asphalt Production Temperature

Materials ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1285 ◽  
Author(s):  
Arminda Almeida ◽  
Michela Sergio
Keyword(s):  
Construction Industry ◽  
Road Construction ◽  
Warm Mix Asphalt ◽  
Asphalt Mixtures ◽  
Asphalt Production ◽  
Air Voids ◽  
Health Concerns ◽  
The Road ◽  
Wide Range ◽  
Production Temperature

Environmental and health concerns have been increasing in the road construction industry. This industry has provided several techniques and a wide range of additives to lower the production temperatures of asphalt mixtures, generating, among others, a new mix type called warm-mix asphalt (WMA). This paper aims to evaluate the potential of the Sasobit REDUX additive to lower the production temperatures of WMA. This additive, which is an alternative to the well-known Sasobit, is completely soluble in bitumen at temperatures above 85 °C while the same temperature for the Sasobit is 115 °C. For that reason, three target compaction temperatures were considered (90, 100 and 110 °C) and both Marshall and compactability tests were carried out. A hot-mix asphalt (HMA) was tested in parallel for comparison. It was concluded that the volumetric properties (air voids content about 4%) and the Marshall properties (stability about 11 kN, flow about 4 mm and Marshall quotient higher than 2 kN/km) of the Sasobit REDUX-WMA were globally satisfactory. In relation to the compactability test, the Sasobit REDUX-WMA mixtures were relatively easier to be compacted compared to the HMA mixture. The three Sasobit REDUX-WMA mixtures (90, 100 and 110 °C) exhibited a very similar compactability (differences lower than 0.4%). Therefore, it seems reasonable to conclude that the Sasobit REDUX has potential to lower WMA production temperatures by 20 °C. A reduction of that magnitude would lead to significant environmental gains.

scholarly journals Saving Energy in the Transportation Sector: An Analysis of Modified Bitumen Application Based on Marshall Test

Energies ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 3025 ◽  
Author(s):  
Syyed Raheel Shah ◽  
Hunain Arshad ◽  
Ahsan Waqar ◽  
Muhammad Saeed ◽  
Salman Hafeez ◽  
...  
Keyword(s):  
Construction Industry ◽  
Road Construction ◽  
Modified Bitumen ◽  
The Road ◽  
Process Modification ◽  
Transportation Sector ◽  
Marshall Test ◽  
Asphalt Mix ◽  
Save Energy ◽  
Major Factors

Energy consumption and material production are two major factors associated with the road construction industry. Worldwide, millions of tons of hot mix asphalt production consume a huge amount of fuel as an energy source in terms of quantity and cost to achieve the standard temperature of up to 170 °C during the mixing process. Modification of bitumen can not only reduce its usage but also the consumption of energy (fuel) during the asphalt mix production process at low temperatures. This study provides a method to save energy by proposing the addition of bitumen modifier in the road construction sector. Furthermore, to make it compatible with the field conditions for road construction, stability analysis is executed on the prepared samples by partially replacing the bitumen with polyurethane foam (PUF) and plastic waste (PW) (at 10%, 20%, 30%, 40%, and 50%). Experimental results demonstrate a reasonable saving in the amount of energy (33%) and material (40% bitumen) used and showed that similar strength of developed asphalt mix can be achieved using PUF. An extensive calculation concludes that these savings could make a huge difference in construction economics of mega road infrastructure projects, especially during an energy crisis.

Constructability of Road Pavement Layers Using New-Age (Nano) Modified Emulsion (NME) Stabilisation of Naturally Available Granular Materials in Roads Varying from Highways to Local Access Roads

2021 ◽  
Author(s):  
Gerrit J Jordaan ◽  
Wynand J vdM Steyn
Keyword(s):  
Granular Materials ◽  
Construction Industry ◽  
Road Construction ◽  
Material Design ◽  
New Age ◽  
Ease Of Use ◽  
Disruptive Technology ◽  
The Road ◽  
General Acceptance ◽  
Pavement Testing

The introduction of any new disruptive technology in a traditionally well-established industry, such as the road construction industry, is usually associated with considerable resistance. This is especially relevant when the new technology is based on the use of granular materials traditionally considered to be of an unacceptable quality in combination with relatively new concepts such as New-age (Nano) Modified Emulsions (NME). In such cases, the fact that the material design methods are based on fundamental scientific principles and have been proven in laboratories and through Accelerated Pavement Testing (APT), may be of little influence. However, the general acceptance of new disruptive technologies, e.g. telecommunications and Information Technologies (IT), have been based on the considerable advantages it presented. The same principles are applicable to the general acceptance and use of NME stabilisation/enhancement of materials in the road construction industry. This article is aimed at the practical demonstration of the advantages of the use of nanotechnologies in the construction of the highest order roads (i.e. inter-city multi-lane highways) to lower order access roads (i.e. Low-Volume-Roads (LVR) and even local accesses to farms and in villages/townships). The implementation of NME technologies is directly associated with ease of use, time and cost savings and the addressing and reduction of risks.

scholarly journals Optimization of activities of road construction company based on lean manufacturing tools

2020 ◽  
Vol 157 ◽  
pp. 06003
Author(s):  
Anna Minnullina ◽  
Natalya Solopova
Keyword(s):  
Construction Industry ◽  
Lean Manufacturing ◽  
Road Construction ◽  
Construction Company ◽  
The Road ◽  
A Company

The article proposes an algorithm for implementation of lean manufacturing in relation to a company in the road construction industry. The concept of lean manufacturing involves the possibility of using several tools at the same time to solve the problems and losses encountered during construction and installation works. The results of testing a tool such as a 5S system in a road construction company are presented to confirm simplicity and effectiveness of the proposed recommendations.

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