scholarly journals Effects of Coarse Aggregate Shape and Texture on Engineering Properties of Roller Compacted Concrete Prepared for High Traffic Routes

2021 ◽  
Vol 10 (1) ◽  
pp. 88-107
Author(s):  
Alban Chidiebere Ogbonna
Keyword(s):  
Laboratory Testing ◽  
Coarse Aggregate ◽  
State Of The Art ◽  
Asphalt Pavement ◽  
Aggregate Size ◽  
Engineering Properties ◽  
Roller Compacted Concrete ◽  
Concrete Mix ◽  
Pavement Construction ◽  
Aggregate Shape

Abstract Use of roller-compacted concrete in pavement construction is increasing. Roller compacted concrete is a zero-slump, highly compacted concrete that is placed by equipment similar to that used in asphalt pavement construction. This investigation was conducted to collect the state-of-the-art information on effects of coarse aggregate size and texture on the strength and workability of roller-compacted concrete (RCC) for pavement construction and maintenance. Concrete specimens containing cubical and rough coarse aggregate, irregular and rough coarse aggregate, angular and rough coarse aggregate, rounded/spherical and smooth coarse aggregate, and flaky/elongated and rough coarse aggregate were prepared at 1:3:3 concrete mix ratio and 0.4 water cement ratio. Laboratory testing of specimens derived from the concrete specimens showed excellent results for cubical and rough coarse aggregate, irregular and rough coarse aggregate, and angular and rough coarse aggregate. Specimens from the rounded/spherical and smooth coarse aggregate, and flaky/elongated and rough coarse aggregate performed poorly in laboratory. The study therefore recommends the use of cubical and rough coarse aggregate, and irregular and rough coarse aggregate in the production of roller-compacted concrete for pavement construction and maintenance.

Analysis and optimization of mechanical properties of recycled concrete based on aggregate characteristics

2021 ◽  
Vol 28 (1) ◽  
pp. 516-527
Author(s):  
Jiangwei Bian ◽  
Wenbing Zhang ◽  
Zhenzhong Shen ◽  
Song Li ◽  
Zhanglan Chen
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Coarse Aggregate ◽  
Aggregate Size ◽  
Peak Stress ◽  
Recycled Concrete ◽  
Maximum Aggregate Size ◽  
Coarse Aggregates ◽  
Aggregate Content ◽  
Aggregate Shape

Abstract The most significant difference between recycled and natural concretes lies in aggregates. The performance of recycled coarse aggregates directly affects the characteristics of recycled concrete. Therefore, an in-depth study of aggregate characteristics is of great significance for improving the quality of recycled concrete. Based on the coarse aggregate content, maximum aggregate size, and aggregate shape, this study uses experiments, theoretical analysis, and numerical simulation to reveal the impact of aggregate characteristics on the mechanical properties of recycled concrete. In this study, we selected the coarse aggregate content, maximum aggregate size, and the aggregate shape as design variables to establish the regression equations of the peak stress and elastic modulus of recycled concrete using the response surface methodology. The results showed that the peak stress and elastic modulus of recycled concrete reach the best when the coarse aggregate content is 45%, the maximum coarse aggregate size is 16 mm, and the regular round coarse aggregates occupy 75%. Such results provide a theoretical basis for the resource utilization and engineering design of recycled aggregates.

scholarly journals Recycling Tire Rubber in Asphalt Pavements: State of the Art

2020 ◽  
Vol 12 (21) ◽  
pp. 9076
Author(s):  
Saud A. Alfayez ◽  
Ahmed R. Suleiman ◽  
Moncef L. Nehdi
Keyword(s):  
State Of The Art ◽  
Permanent Deformation ◽  
Engineering Properties ◽  
Asphalt Pavements ◽  
Future Research ◽  
Tire Rubber ◽  
Durability Assessment ◽  
Overall Performance ◽  
Pavement Construction ◽  
Critical Overview

The use of recycled tire rubber in asphalt pavements to improve the overall performance, economy, and sustainability of pavements has gained considerable attention over the last few decades. Several studies have indicated that recycled tire rubber can reduce the permanent deformation of flexible pavements and enhance its resistance to rutting, reduce pavement construction and maintenance costs, and improve the resistance to fatigue damage. This paper provides a systematic and critical overview of the research on and practice of using recycled tire rubber in asphalt pavements in terms of engineering properties, performance, and durability assessment. This critical analysis of the state-of-the-art should enhance the understanding of using recycled tire rubber in asphalt pavements, define pertinent recommendations, identify knowledge gaps, and highlight the need for concerted future research.

scholarly journals Sintered Calcined Clay as an Alternative Coarse Aggregate for Asphalt Pavement Construction

2015 ◽  
Vol 05 (03) ◽  
pp. 281-288 ◽  
Author(s):  
Cleudinei Lopes da Silva ◽  
Hidembergue Ordozgoith da Frota ◽  
Consuelo Alves da Frota
Keyword(s):  
Coarse Aggregate ◽  
Asphalt Pavement ◽  
Calcined Clay ◽  
Pavement Construction

scholarly journals Utilisation of Waste-Based Geopolymer in Asphalt Pavement Modification and Construction—A Review

2021 ◽  
Vol 13 (6) ◽  
pp. 3330
Author(s):  
Abdalrhman Milad ◽  
Ahmed Suliman B. Ali ◽  
Ali Mohammed Babalghaith ◽  
Zubair Ahmed Memon ◽  
Nuha S. Mashaan ◽  
...  
Keyword(s):  
Asphalt Pavement ◽  
Mine Waste ◽  
Asphalt Mixture ◽  
Environmental Benefits ◽  
Engineering Properties ◽  
Asphalt Binders ◽  
Modified Asphalt ◽  
Low Temperature Cracking ◽  
Pavement Construction ◽  
By Products

The use of geopolymer in pavement constructions is strongly encouraged. Many studies have demonstrated the vast potential of using industrial-by-products-based geopolymers. This paper discusses the modification of asphalt binders with geopolymers, namely geopolymer-modified asphalt (GMA) and geopolymer-modified asphalt mixture (GMAM). In addition, curing geopolymer materials, engineering properties, production techniques, and prospective utilisation in the pavement construction, such as durability and sustainability, are also discussed. The literature review showed that many industrial by-products, including red mud, blast furnace slag, fly ash, and mine waste, are used to produce geopolymers because of the metal components such as silicon and aluminium in these materials. The geopolymers from these materials influence the rheological and physical properties of asphalt binders. Geopolymers can enhance asphalt mixture performance, such as stability, fatigue, rutting, and low-temperature cracking. The use of geopolymers in asphalt pavement has beneficial impacts on sustainability and economic and environmental benefits.

scholarly journals A Methodology of Waste Material Utilization in Concrete Mix for Rigid Pavement Construction

2021 ◽  
Vol 9 (9) ◽  
pp. 2124-2128
Author(s):  
Ramkrishna Birla
Keyword(s):  
Natural Resources ◽  
Coarse Aggregate ◽  
Waste Material ◽  
Ecological Problem ◽  
Fine Aggregate ◽  
Rigid Pavement ◽  
Concrete Production ◽  
Concrete Mix ◽  
Pavement Construction

Abstract: The demand of concrete for rigid pavement construction is constantly growing. Thus, the extraction of fine aggregate, coarse aggregate and cement from natural resources also increases. The more extraction of these virgin materials from the natural resources enhances the cost of these materials progressively. Therefore, it has severely affected the financial viability of the government for rigid pavement construction. Further, due to urbanization and industrialization the amount of waste material is also increased. This state creating an ecological problem that must be addressed. Therefore, there is an urgent need to preserve natural resources by using recycled or discarded wastes as a construction material. Hence the main objective of this work is to study of utilization of waste material in concrete production for rigid pavement construction. A four stages methodology is proposed in this study. these stages are (I) Determination of quantity of various materials for development of concrete mix (II) Identification of significant waste materials and their properties (III) Prepare concrete mix using replacement of cement, sand, and aggregate by waste material and (IV) Comparative evaluation of different properties of developed concrete mix. This study to check the suitability of waste foundry sand (WFS), granulated blast furnace slag (GBFS), and waste rubber tyre (WRT) as a replacement of fine aggregate, cement, and coarse aggregate respectively. The analysis and results indicated that WFS, GBFS, and WRT can be used as a replacement of fine aggregate, cement, and coarse aggregate respectively. Thus, it is expected that the proposed methodology will be useful for researcher to determination of suitability of different alternative materials for replacement of cement, fine aggregate, and coarse aggregate Keywords: Concrete mix, Waste Material, GGBS, WFS, WRT etc.

Study of warm mix asphalt using reclaimed asphalt pavement and copper slag: a review

2020 ◽  
Vol 47 (4) ◽  
pp. 355-362 ◽  
Author(s):  
Ishfaq Mohi ud Din ◽  
Mohammad Shafi Mir
Keyword(s):  
Asphalt Pavement ◽  
Road Construction ◽  
Copper Slag ◽  
Warm Mix Asphalt ◽  
Environmental Benefits ◽  
Engineering Properties ◽  
Asphalt Pavements ◽  
Construction Sector ◽  
Pavement Construction ◽  
Work Done

The incorporation of copper slag (CS) in asphalt pavements proves to be a good substitute in replacing the natural aggregates. This reduces pavement construction cost and plays a key role in protecting the environment. The CS can be used with recycled asphalt pavement (RAP) material especially in warm mix asphalt pavements. The use of RAP not only leads to environmental benefits but also considerably saves natural resources and decreases the requirement to use virgin bitumen. The use of CS in pavement construction sector eliminates the disposal as well as leaching problems associated with it. This paper focuses on the review of studies carried out on the use of CS along with RAP in road construction. It presents and discusses the work done on the use of CS in the pavement construction sector and the use of RAP in providing the necessary stiffening effect to the asphalt pavements. It analyzes the requirement and advantage of using CS with RAP in asphalt pavements in light of previous research findings and its influence on various engineering properties in pavements. This paper also reviews the work done to study the environmental impact of using CS in asphalt mixes.

scholarly journals Effect of Local Binary Mixtures of Coarse Aggregates on the Compressive Properties of Concrete

2020 ◽  
Vol 4 (1) ◽  
pp. 152-159
Author(s):  
O. K. Eze ◽  
E. Nwankwo
Keyword(s):  
Coarse Aggregate ◽  
Aggregate Size ◽  
Absorption Capacity ◽  
Maximum Aggregate Size ◽  
Compressive Properties ◽  
Coarse Aggregates ◽  
Concrete Production ◽  
Concrete Mix ◽  
Edo State ◽  
Compressive Strength Of Concrete

Aggregates, though considered inert, are the primary components that define concrete’s thermal and elastic properties. It has been shown that factors such as maximum aggregate size, grading, shape, strength, water absorption capacity of coarse aggregates affect the properties of concrete. However, improper grading of coarse aggregate could have adverse effect on the amount of cement and water requirement for concrete production. Thus, impacting on the workability, pump-ability and durability of concrete. By maintaining a slump of 50 mm, the effect of varying sizes of coarse aggregates – 10 mm, 14 mm, 20 mm, and combination of these sizes – on the mechanical properties of concrete was obtained. Aggregates, which were used in this work, were sourced from quarries located in Auchi area of Edo State and had impact values between 16% and 28%. It was observed that the higher the coarse aggregate sizes the lower the water – cement (w/c) ratio required to obtain adequate workability. Also, the compressive strength of concrete was observed to be a function of the size of the coarse aggregates used in the concrete mix. It was observed that concrete made with equal proportions of 10 mm and 14 mm coarse aggregate had lower strengths compared to concrete made with 14 mm and 20 mm aggregates. This implies that combination of large sizes of aggregates produced stronger concrete when compared to combinations of smaller sizes of aggregates. It was also observed that density of concrete increased with increasing size of aggregates.

scholarly journals Studi Mengenai Perlakuan Agregat Berukuran 2,38 mm ­ 4,75 mm sebagai Agregat Kasar dalam Campuran Beton (Hal. 22-31)

2018 ◽  
Vol 4 (4) ◽  
pp. 22
Author(s):  
Ahmad Ramdani ◽  
Priyanto Saelan
Keyword(s):  
Compressive Strength ◽  
Coarse Aggregate ◽  
Aggregate Size ◽  
Self Compacting Concrete ◽  
Cylinder Diameter ◽  
Strength Tests ◽  
Concrete Mix ◽  
Crushed Aggregate

ABSTRAKBatu pecah berukuran 2,38 mm – 4,75 mm tidak digunakan dalam campuran beton. Jika campuran beton dirancang menggunakan batu pecah ini sebagai agregat kasar, maka campuran beton yang dihasilkan diduga tidak akan mengalami segregasi untuk semua kelecakan, lebih homogen, dan jika diberi bahan tambahan superplasticizer diduga dapat dengan mudah berperilaku sebagai campuran beton memadat mandiri. Penelitian ini dilakukan untuk membuktikan dugaan tersebut. Penelitian dilakukan dengan kuat tekan rencana 30 MPa, slump 40 mm dan 100 mm, tanpa dan dengan bahan tambahan superplasticizer dengan dosis 1% dan 1,5%. Perancangan campuran beton dengan cara Dreux menggunakan faktor granular 0,40; 0,45; 0,50; dan 0,55. Pengujian kuat tekan pada benda uji silinder diameter 10 cm dan tinggi 20 cm membuktikan bahwa dugaan tersebut adalah benar, dan perancangan campuran beton dengan memperlakukan batu pecah berukuran 2,38 mm – 4,75 mm sebagai agregat kasar dapat dilakukan untuk faktor granular 0,40 – 0,50.Kata kunci: batu pecah berukuran 2,38 mm – 4,75 mm,agregat kasar,superplasticizer ABSTRACT2.38 mm – 4.75 mm crushed aggregate size is not used in concrete mix. If this crushed aggregate is used as coarse aggregate, the resulting concrete mix is assumed will not segregate in all workability, more homogeneous, and it will behave easily as self-compacting concrete by adding superplasticizer. This research was conducted to prove these assumption. Concrete mix with compressive strength of 30 MPa, 40 mm and 100 mm slump is made using Dreux method with granular factor 0.40; 0.45; 0.50; and 0.55. The doses of superplasticizer is 1% and 1.5% by cement weight. Compressive strength tests of 10 cm diameter and 20 cm height cylinder diameter showed these assumption is true, and concrete mix can be designed using granular factor 0.40 – 0.50.Keywords: 2,38 mm – 4,75 mm crushed aggregate size, coarse aggregate, superplasticizer

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