scholarly journals Suitability Assessment of Construction and Demolition Waste as a Highway Material

2021 ◽  
Vol 3 (1) ◽  
pp. 1-5
Author(s):  
Afroja Sultana
Keyword(s):  
Specific Gravity ◽  
Environmental Pollution ◽  
Water Absorption ◽  
Road Construction ◽  
Flexible Pavement ◽  
Construction And Demolition Waste ◽  
Test Results ◽  
Demolition Waste ◽  
Los Angeles Abrasion ◽  
Aggregate Impact Value

For Being a developing country urbanization is growing rapidly in Bangladesh and there has been a significant increase in the construction of roads. But due to lack of financial aid many of the roads are still unsealed. However, not only the utilization of Construction and Demolition Waste (CDW) in flexible pavement will be helpful for the reduction of road construction costs but also it will help to reduce environmental pollution which may be caused by disposing CDW in open area. The objective of this research is to utilize the CDW in base and sub base layers in the flexible pavement design to reduce the cost of road construction and environmental pollution. Proceeding by collecting CDW like brick from demolished building and conventional brick from kiln, a no of standard test conducted in laboratory namely Aggregate Impact Value, Crushing Value, Specific Gravity, Water Absorption and Loss Angeles Abrasion Test for three times. After analyzing the test results, we found that the average Aggregate Impact Value for CDW and Conventional Aggregate (CA) are respectively 29.52% and 23.87%, Aggregate Crushing value for CDW and CA are respectively 28.10% and 22.88%, Los Angeles Abrasion value for CDW and CA are respectively 31.47% and 28.52%, specific gravity value for CDW and CA both is 1.75, water absorption for CDW and CA are respectively 7.62% and 12.23%. After analyzing the test results and comparing with the standard value, we figure out that the CDW are useful for using base and sub base layers in the flexible pavement.

Rutting Performance of Road Using Construction and Demolition Waste Materials

2021 ◽  
Vol 882 ◽  
pp. 221-227
Author(s):  
Arpan Ray ◽  
Radhikesh Prasad Nanda ◽  
Pronab Roy
Keyword(s):  
Analytical Model ◽  
Soil Layer ◽  
Road Construction ◽  
Construction And Demolition Waste ◽  
Waste Materials ◽  
Layer System ◽  
Demolition Waste ◽  
Strength Criteria ◽  
Concrete Layer ◽  
Aggregate Impact Value

Wastes arising from construction and demolition (C & D) constitute one of the major streams in many countries. In this paper experimental investigation was carried to see the feasibility of C& D waste as road aggregates. From the grading analysis it was observed that using C& D wastes, strength criteria is being satisfied and meet the specifications of MORTH which is then subjected to aggregate impact value (AIV) testing, CBR testing etc. The CBR value of C&D waste was found to be 43.46 which were well above the permissible value. A proposed three-layer system using soil layer, C & D waste layer and asphalt concrete layer is chosen to estimate rut depth using existing analytical model. From the analytical model rut depth is predicted to be 14.77 mm which is less then maximum allowable limits. Hence C& D waste materials can be used as alternate materials in road construction with economy and sustainability.

scholarly journals Study on Preparation of Brick Blocks by Using Construction Waste and Sludge

2021 ◽  
Author(s):  
Raguraman Vaithiyasubramanian ◽  
Deepasree Sriniva ◽  
Arul Kumar Kanagarajan
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Water Absorption ◽  
Bulk Density ◽  
Chemical Characterization ◽  
Waste Utilization ◽  
Construction And Demolition Waste ◽  
Test Results ◽  
Demolition Waste ◽  
Sludge Waste

Abstract Sewage waste is a crucial factor in the disposal and also harmful to the environment. The growing demand for waste utilization is construction and demolition waste. This study aims in preparing a brick using construction and demolition waste and sludge waste. The materials such as fly-ash, cement, construction, and demolition waste, and sludge waste are used. The sludge content was added at constant percentage of 30%, 40% and 50% with different proportions such of fly-ash, cement and demolition waste of 3:2:2, 1:3:2, 2:1:2, 2:3:2, 2:3:1, 2:2:1, 2:2:3, 3:2:1, and 1.5:1.5:2 respectively. The physical characteristics such as compressive strength, bulk density, and chemical characterization such as water absorption, pH, and detection of heavy metals were carried out. The test results infer that increase in the content of sludge, the strength decreased. Maximum compressive strength of 14.5 Mpa was achieved for the ratio of 2:3:2 at 30% of sludge. The maximum bulk density was achieved at 30% of sludge. This was attributed due to the presence of organic properties in the brick. Moreover, the water absorption increases with an increase in the percentage of sludge.

scholarly journals Development of New Eco-Efficient Cement-Based Construction Materials and Recycled Fine Aggregates and EPS from CDW

2017 ◽  
Vol 11 (1) ◽  
pp. 381-394 ◽  
Author(s):  
Pilar Mercader-Moyano ◽  
Maria Victoria Requena García-de-la-Cruz ◽  
Marta Edith Yajnes
Keyword(s):  
Waste Management ◽  
Water Absorption ◽  
Research Work ◽  
Construction Materials ◽  
Construction And Demolition Waste ◽  
Construction Costs ◽  
Demolition Waste ◽  
Improve Energy Efficiency ◽  
Efficient Construction ◽  
Construction Product

Background: This research paper presents the results of the characterization and adaptation of the construction product developed by the Experimental Centre of Production of the Faculty of Architecture, Design and Urbanism of the University of Buenos Aires, Argentina (CEP FADU UBA) for Spanish regulations. Additionally, it shows the study of the industrialization of its manufacturing process in Spain. The product consists of a cement-based compound that includes recycled fine ceramic aggregates and EPS from rehabilitation works. Objectives: The aim of this research work is to propose a new eco-efficient construction product adapted to Spanish and European regulations in order to minimize the environmental impact of the construction activity, improve energy efficiency and reduce construction costs. Furthermore, it is presented as a solution to the problem that construction and demolition waste management represents. Method and Results: Samples have been tested to the water absorption and compression resistance tests according to UNE standards. These parameters serve to delimit its use in new sustainable constructive solutions for the design of zero energy consumption buildings (nZEB). Conclusion: Results show that it is possible to obtain certain samples that include recycled ceramic aggregates and EPS which present good response to the mechanical and water absorption tests. In addition, it is obtained that industrializing this product in Spain is complex due to the current waste management system.

The Effects of Na2SiO3/NaOH Ratios on the Volumetric Properties of Fly Ash Geopolymer Artificial Aggregates

2019 ◽  
Vol 967 ◽  
pp. 228-235
Author(s):  
I Dewa Made Alit Karyawan ◽  
Januarti Jaya Ekaputri ◽  
Iswandaru Widyatmoko ◽  
Ervina Ariatedja
Keyword(s):  
Electron Microscope ◽  
Fly Ash ◽  
Scanning Electron Microscope ◽  
Specific Gravity ◽  
Water Absorption ◽  
Asphalt Mixture ◽  
Interfacial Transition Zone ◽  
Volumetric Properties ◽  
Test Results ◽  
Scanning Electron

This study was conducted as a part of a research to assess the influence of the volumetric properties of geopolymer artificial aggregates made of fly ash to the performance of asphalt mixture to be used in pavement layers. This paper presents the parameters adopted during the production of geopolymer artificial aggregates which may affect the volumetric properties and the structure of the aggregates. The investigated volumetric properties included specific gravity and water absorption. In the experiment laboratory, two variables were utilized for producing the artificial aggregates, which might affect the considered volumetric properties. Those variables are pan-granulator slopes and alkaline ratios (the ratios of Sodium Silicate to Sodium Hydroxide). The pan-granulator slopes were set at 3 different angles, i.e. 45o, 50o, and 55o. The selected alkaline ratios were 1.5, 2.0, 2.5, and 3.0. The test results indicated that the best volumetric properties were obtained at a slope of 50o and alkaline ratio of 2.5. The bulk specific gravity values at the best volumetric properties were found to be: 1) oven dry at 1.9 grams/cm3; 2) saturated surface dry (SSD) at 2.0 grams/cm3, and 3) apparent at 2.1 grams/cm3 with 6% water absorption. In addition, the interfacial transition zone and microstructure aggregates were examined by using Scanning Electron Microscope (SEM). In this study, it was found that there were effects of Na2SiO3/ NaOH ratios and the granulation method on the volumetric properties.

Production of upgraded recycled aggregates from construction and demolition waste for replacement of primary sand in cement mortars

2020 ◽  
Author(s):  
Michael Galetakis ◽  
Athanasia Soultana ◽  
Theodoros Daskalakis
Keyword(s):  
Water Absorption ◽  
Cement Paste ◽  
Cement Mortar ◽  
Recycled Concrete ◽  
Construction And Demolition Waste ◽  
Recycled Aggregates ◽  
Demolition Waste ◽  
Cement Mortars ◽  
Limestone Sand ◽  
Crushed Limestone

<p>Waste concrete is the most predominant constituent material among construction and demolition waste. Recycling of this material could minimize landfilled waste and mineral resources depletion. This study investigates, in laboratory scale, the production of upgraded recycled concrete aggregates, suitable for the replacement of primary (crushed limestone sand) used in cement mortars, by means of selective crushing and autogenous grinding. These particle size reduction techniques, compared to traditional crushing/grinding, have the potential to remove the brittle cement paste from the aggregates, thus significantly improving their quality. The granulometry, the density, the water absorption (EN 13755) and the flow coefficient (EN 933-6) of the produced upgraded sand was determined and compared to crushed limestone sand. Subsequently, cement mortar specimens were manufactured using upgraded aggregates for total replacement of crushed limestone sand. Specimens were tested for their compressive and flexural strength (EN 196-1), density and water absorption. Results indicated that the upgraded recycled sand produced through the selective crushing and autogenous grinding processes had improved properties compared to the one produced by conventional crushing processes (flexural and compressive strength of cement mortar specimens were increased by 29% and 7%, respectively). However, the quality of the upgraded sand is lower than that of the primary crushed limestone. To further explore the issue, it is planned to investigate in more detail the process of autogenous grinding and to investigate the use of other selective aggregate-cement paste liberation technologies.</p>

Non Destructive Testing of Concrete with Recycled Cement Powder

2016 ◽  
Vol 825 ◽  
pp. 45-48 ◽  
Author(s):  
Tereza Pavlů ◽  
Magdaléna Šefflová
Keyword(s):  
Physical Properties ◽  
Water Absorption ◽  
Absorption Capacity ◽  
Recycled Concrete ◽  
Construction And Demolition Waste ◽  
Partial Replacement ◽  
Fine Aggregate ◽  
Demolition Waste ◽  
Aggregate Concrete ◽  
Cement Powder

This study deals with determination of the physical properties of fine-aggregate concrete with partial replacement of cement in concrete mixture. Cement was replaced by recycled cement powder originating from construction and demolition waste. The main goal of this study is evaluation of the basic physical properties of the fine-aggregate concrete with partial cement replacement by recycled concrete powder such as density, water absorption capacity and capillary water absorption. The fine recycled concrete which was used as partial replacement of cement had the same grain size as cement. The replacement rate was 0 %, 5 %, 10 % and 15 %. Physical properties were investigated by using cubic and prismatic specimens.

Evaluating and improving the construction and demolition waste technical properties to use in road construction

2020 ◽  
Vol 23 ◽  
pp. 100349
Author(s):  
Gholamhosein Tavakoli Mehrjardi ◽  
Alireza Azizi ◽  
Amanj Haji-Azizi ◽  
Gholamreza Asdollafardi
Keyword(s):  
Road Construction ◽  
Construction And Demolition Waste ◽  
Demolition Waste ◽  
Technical Properties

Estimation of Water Absorption Capacity of Hardened Concrete with Recycled Aggregate Based on Experimental Determination

2015 ◽  
Vol 732 ◽  
pp. 411-414 ◽  
Author(s):  
Tereza Pavlů ◽  
Magdaléna Šefflová
Keyword(s):  
Water Absorption ◽  
Negative Impact ◽  
High Water ◽  
Absorption Capacity ◽  
Recycled Concrete ◽  
Construction And Demolition Waste ◽  
Recycled Aggregate ◽  
Hardened Concrete ◽  
Water Absorption Capacity ◽  
Demolition Waste

Recycled construction and demolition waste, especially recycled concrete, is able to use as an aggregate for concrete. The high water absorption capacity (WA) of recycled aggregate has a negative impact of concrete mix workability and influences the water-cement ratio. This paper presents results of experimental measurement of WA of recycled aggregate and recycled concrete. Series of concrete samples with various replacement ratios of natural aggregate and recycled aggregate were prepared for this study. The main aim of this study is to analyze the influence of recycled aggregate WA, and mixture ratios on the WA of hardened concrete (HC). Regression model to estimate the WA of hardened concrete is presented.

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