The Experts below are selected from a list of 162 Experts worldwide ranked by ideXlab platform

Victoria Sonntag - One of the best experts on this subject based on the ideXlab platform.

  • using recovered glass as Construction Aggregate feedstock
    Transportation Research Record, 1994
    Co-Authors: C J Shin, Victoria Sonntag
    Abstract:

    The success of recycling collection programs has resulted in an over-supply of broken glass, or cullet, in many parts of the country. To open the Construction Aggregate market, a multistate and industry evaluation of glass as Construction Aggregate was conducted. The study defines the suitability of cullet as a Construction Aggregate in terms of its engineering performance, environmental impact, cost comparability with natural Aggregates, and safety in handling. The analysis concludes that glass, as an Aggregate, is strong, clean, safe, and economical. From an engineering standpoint, cullet appears to be an excellent supplement or replacement for natural Aggregates in many Construction applications. Comprehensive tests were performed for specific gravity, gradation, workability, durability, compaction, permeability, thermal conductivity, and shear strength. The effects of debris level, cullet content as a percentage of Aggregate, and cullet size were also investigated. When cullet is compacted to a dense state, the material is rigid and strong. The test data indicate that under normal working stresses, the moduli and shear strength of the cullet samples are similar to those of natural Aggregate. In the case of 1/4-in. minus cullet, adding cullet to the natural Aggregate can even increase the rigidity and strength. Compaction curves tend to become flatter as cullet content increases, implying that the maximum dry density is relatively insensitive with respect to moisture. From a Construction standpoint, this means that the material can be compacted even in wet weather.

Susan Hunnewell Morin - One of the best experts on this subject based on the ideXlab platform.

  • frost susceptibility of crushed glass used as Construction Aggregate
    Journal of Cold Regions Engineering, 1997
    Co-Authors: Karen S Henry, Susan Hunnewell Morin
    Abstract:

    The frost susceptibility for 100% glass cullet specimens and 30% by weight glass cullet-Aggregate specimens was determined using ASTM D 5918. The cullet has negligible to very low frost susceptibility, and it did not increase the frost susceptibility of the Aggregate. Based on a comparison of grain size distributions of the cullet and Aggregates with the work of others, we conclude that the material tested represents typical cullet for which other engineering properties have been determined; therefore, this information can be added to the current body of knowledge about the engineering properties of glass cullet.

  • FROST SUSCEPTIBILITY OF CRUSHED GLASS USED AS Construction Aggregate. TECHNICAL NOTE
    Journal of Cold Regions Engineering, 1997
    Co-Authors: Karen S Henry, Susan Hunnewell Morin
    Abstract:

    The frost susceptibility for 100% glass cullet specimens and 30% by weight glass cullet-Aggregate specimens was determined using ASTM D 5918. The cullet has negligible to very low frost susceptibility, and it did not increase the frost susceptibility of the Aggregate. Based on a comparison of grain size distributions of the cullet and Aggregates with the work of others, we conclude that the material tested represents typical cullet for which other engineering properties have been determined; therefore, this information can be added to the current body of knowledge about the engineering properties of glass cullet.

Katherine E Kapo - One of the best experts on this subject based on the ideXlab platform.

  • a gis analysis of suitability for Construction Aggregate recycling sites using regional transportation network and population density features
    Resources Conservation and Recycling, 2004
    Co-Authors: Gilpin R Robinson, Katherine E Kapo
    Abstract:

    Abstract Aggregate is used in road and building Construction to provide bulk, strength, support, and wear resistance. Reclaimed asphalt pavement (RAP) and reclaimed Portland cement concrete (RPCC) are abundant and available sources of recycled Aggregate. In this paper, current Aggregate production operations in Virginia, Maryland, and the District of Columbia are used to develop spatial association models for the recycled Aggregate industry with regional transportation network and population density features. The cost of Construction Aggregate to the end user is strongly influenced by the cost of transporting processed Aggregate from the production site to the Construction site. More than 60% of operations recycling Aggregate in the mid-Atlantic study area are located within 4.8 km (3 miles) of an interstate highway. Transportation corridors provide both sites of likely road Construction where Aggregate is used and an efficient means to move both materials and on-site processing equipment back and forth from various work sites to the recycling operations. Urban and developing areas provide a high market demand for Aggregate and a ready source of Construction debris that may be processed into recycled Aggregate. Most Aggregate recycling operators in the study area are sited in counties with population densities exceeding 77 people/km 2 (200 people/mile 2 ). No Aggregate recycling operations are sited in counties with less than 19 people/km 2 (50 people/mile 2 ), reflecting the lack of sufficient long-term sources of Construction debris to be used as an Aggregate source, as well as the lack of a sufficient market demand for Aggregate in most rural areas to locate a recycling operation there or justify the required investment in the equipment to process and produce recycled Aggregate. Weights of evidence analyses (WofE), measuring correlation on an area-normalized basis, and weighted logistic regression (WLR), are used to model the distribution of RAP and RPCC operations relative to transportation network and population distribution data. The models can be used on a regional scale to quickly map the relative site suitability for a RAP or RPCC Aggregate recycling operation in a particular area based on transportation network and population parameters. The results can be used to identify general areas to be further evaluated on a site-specific basis using more detailed marketplace information. As transportation or population features change due to planning or actual development, the models can be easily revised to reflect these changes.

C J Shin - One of the best experts on this subject based on the ideXlab platform.

  • using recovered glass as Construction Aggregate feedstock
    Transportation Research Record, 1994
    Co-Authors: C J Shin, Victoria Sonntag
    Abstract:

    The success of recycling collection programs has resulted in an over-supply of broken glass, or cullet, in many parts of the country. To open the Construction Aggregate market, a multistate and industry evaluation of glass as Construction Aggregate was conducted. The study defines the suitability of cullet as a Construction Aggregate in terms of its engineering performance, environmental impact, cost comparability with natural Aggregates, and safety in handling. The analysis concludes that glass, as an Aggregate, is strong, clean, safe, and economical. From an engineering standpoint, cullet appears to be an excellent supplement or replacement for natural Aggregates in many Construction applications. Comprehensive tests were performed for specific gravity, gradation, workability, durability, compaction, permeability, thermal conductivity, and shear strength. The effects of debris level, cullet content as a percentage of Aggregate, and cullet size were also investigated. When cullet is compacted to a dense state, the material is rigid and strong. The test data indicate that under normal working stresses, the moduli and shear strength of the cullet samples are similar to those of natural Aggregate. In the case of 1/4-in. minus cullet, adding cullet to the natural Aggregate can even increase the rigidity and strength. Compaction curves tend to become flatter as cullet content increases, implying that the maximum dry density is relatively insensitive with respect to moisture. From a Construction standpoint, this means that the material can be compacted even in wet weather.

John Yeaman - One of the best experts on this subject based on the ideXlab platform.

  • UTILIZING PLASTIC FOR PRETREATING RECYCLED Construction Aggregate TO ELIMINATE BINDER ABSORPTION IN ASPHALT MIXTURE
    Proceedings of International Structural Engineering and Construction, 2018
    Co-Authors: Farzaneh Tahmoorian, John Yeaman
    Abstract:

    The growing quantities of waste materials, lack of natural resources and shortage of landfill spaces represent the importance of finding innovative ways of reusing and recycling waste materials. Due to the large quantities of Construction and demolition waste (CDW), recycling and utilization of Recycled Construction Aggregates (RCA) obtained from CDW in Construction projects, including asphalt pavement Construction, can be the most promising solution to this problem. Asphalt mixtures containing RCA have the problem of high bitumen absorption. Using plastic waste in RCA-contained asphalt mixtures reduces not only bitumen absorption but also the adverse environmental impacts associated with plastic waste disposal due to the nonbiodegradability of plastic waste. In addition, the demand reduction for virgin Aggregates is another advantage resulting in subsequent economic advantages. This paper characterizes the effects of different types of plastic on the bitumen absorption and properties of asphalt mixtures containing RCA through laboratory investigation. Different types of plastic including High-Density Polyethylene (HDPE) and LowDensity Polyethylene (LDPE) were investigated in this research. The test results indicate that the plastic waste can be a viable material for improving the problem of high bitumen absorption of asphalt mixtures containing RCA.

  • Study of the characteristics of different components of recycled Construction Aggregate (RCA): Statistical study in Sydney
    International Journal of Geomate, 2018
    Co-Authors: Farzaneh Tahmoorian, Bijan Samali, John Yeaman
    Abstract:

    The rapid economic growth of countries has led to the Construction of new structures and infrastructures. Construction projects use up large quantities of natural resources and produce tones of Construction and demolition waste (CDW). Because of its growth, these quantities have increased in the last few years and it has now become necessary to create a sustainable method of development in civil Construction. Therefore, utilization of recycled materials in Construction projects can be the most promising solution to this problem. The utilization of recycled materials including recycled Construction Aggregates (RCA) in the pavement industry and asphalt production is particularly very promising as 90% of asphalt is made of Aggregates. However, the variability in behavior and performance of RCA used in Construction projects indicates the variability in their composition. Therefore, in spite of the awareness of the importance of using RCA and much research being conducted, there is still a need for a deeper study of the composition of the RCA. This paper presents the results of the statistical study and experimental work to evaluate the characteristics of RCA as an alternative for virgin Aggregate in the asphalt mixture. To this point, a series of characterization tests were conducted RCA samples collected at different dates.

  • Evaluation of Mechanical Properties of Recycled Material for Utilization in Asphalt Mixtures
    Applied Sciences, 2017
    Co-Authors: Farzaneh Tahmoorian, Bijan Samali, Vivian W. Y Tam, John Yeaman
    Abstract:

    With an expanding world, the demand for extensive road networks is increasing. As natural resources become scarce, the necessity of finding alternative resources has led to the idea of applying recycled material to pavement Construction including asphalt pavements. Amongst all asphalt components, Aggregate constitutes the largest part of asphalt mixtures. Therefore, the utilization of recycled material for Aggregate will represent an important opportunity to save virgin material and divert material away from landfills. Because of the large amount of Construction waste generation around the world, using recycled Construction Aggregate (RCA) in asphalt mixtures appears to be an effective utilization of RCA. However, as Aggregate plays an important role in the final performance of the asphalt mixture, an understanding of their properties is essential in designing an asphalt mixture. Therefore, in this research, the properties of RCA have been evaluated through laboratory investigations. Based on the test results, it is required that combination of RCA with some other targeted waste materials be considered in asphalt mixture. This paper presents the results of an experimental study to evaluate the RCA properties as an alternative for virgin Aggregate in asphalt mixture under different percentages and combination with other Aggregates, such as reclaimed asphalt pavement (RAP) and basalt.