Life Cycle Analysis of High Quality Recycled Aggregate Produced by Heating and Rubbing Method

Shima, Hideo; Matsuhashi, Ryuji; Yoshida, Yoshikuni; Tateyashiki, Hisashi

doi:10.1541/ieejeiss.123.1680

Cited by 10 publications

(6 citation statements)

References 2 publications

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“…While the production of recycled aggregate using the HRM consumes much fuel for heating and electricity for rubbing, our life-cycle analysis showed that the use of the HRM can reduce CO 2 emissions through the utilisation of the HRM powder as cement-related inputs as mentioned above (Shima 2003a, Shima 2004a.…”

Section: Introductionmentioning

confidence: 72%

“…This method is proved to be very effective to reduce CO 2 in keeping with the Kyoto Protocol. As for the life cycle energy, its use of recycled aggregate is greater than that of crashed stone as ordinary aggregate because the deduction of energy consumption during cement manufacturing by the powder is relatively small (Shima 2003a).…”

Section: Life Cycle Energy and Co 2 Of High Quality Recycled Aggregatmentioning

confidence: 99%

See 1 more Smart Citation

An Advanced Concrete Recycling Technology and its Applicability Assessment through Input-Output Analysis

Shima

Tateyashiki

Matsuhashi

et al. 2005

ACT

Self Cite

184

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While at present mostly recycled into road subbase, the amount of demolished concrete in Japan is expected to increase rapidly and exceed the demand for road subbase in the near future. To promote the recycling of concrete, a technology to produce high-quality recycled aggregate has been developed. This technology employs the heating and rubbing method. In order to investigate a future concrete recycling system, first of all, a specific model considering indices of economic activity is established to forecast the amount of demolished concrete in the future. Furthermore, an input-output table is extended by a detailed description of concrete-related industries such as construction, aggregate, cement, and ready-mixed concrete, and several concrete recycling processes have been added．The linear programming model connected to the input-output table assumes that the technology will be introduced in 2020. A subsidy for high-quality recycled aggregate and a carbon tax are found to be effective ways to promote the early introduction of the technology. This series of analysis can be widely used in other countries for investigating suitable recycling systems focusing on the cement and concrete industry as well as the applicability of each individual concrete recycling technology.

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Section: Introductionmentioning

confidence: 72%

Section: Life Cycle Energy and Co 2 Of High Quality Recycled Aggregatmentioning

confidence: 99%

An Advanced Concrete Recycling Technology and its Applicability Assessment through Input-Output Analysis

Shima

Tateyashiki

Matsuhashi

et al. 2005

ACT

Self Cite

184

View full text Add to dashboard Cite

show abstract

“…Kinds of energy and its amount for both Type I recycled aggregates were obtained through literature survey (CRR 1997, Shima et al 2001, Mitsubishi Materials 2001.…”

Section: Disposal and Recyclingmentioning

confidence: 99%

Inventory Data and Case Studies for Environmental Performance Evaluation of Concrete Structure Construction

Kawai

Sugiyama

Kobayashi

et al. 2005

ACT

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This paper aims to provide common basis for the estimation of emission inventory data necessary for the evaluation of environmental impact of a concrete structure through its life cycle. Intensive literature survey and hearing to the institutes concerned have been deliberately conducted to collect relevant data to concrete materials, other materials involved, construction, demolition, and disposal and recycling. Consequently emission inventory data of CO 2 , SO x , NO x , and particulate matter were able to be prepared in an objective way. In addition, fundamental inventory data of these emission gases and particulate matter were provided for various kinds of energy. Furthermore most commonly used machines, instruments and other equipments on concrete structure construction are presented and provided for their related inventory data. In this way, inventory data regarding 91 detail items in total were able to be provided. By using these inventory data, four case studies where environmental impact caused by the construction of concrete structures was considered as a performance parameter of the structures similarly to serviceability, safety, and durability of the structures were also investigated based on design methods proposed previously by the authors in order to confirm the applicability of these inventory data to environmental performance evaluation of concrete structures.

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“…Some scholars have proposed methods to improve the quality of RFA and recycled coarse aggregate (RCA). These methods include removing the attached mortar by ultrasonic cleaning [22], using microbial-induced mineralization deposition to improve the quality of the RFA [23], heating the RCA and then rubbing it [24], or pre-soaking the RCA with HCl, H 2 SO 4 , and H 3 PO 4 [25]. However, these methods can negatively impact the materials and the environment [26].…”

Section: Introductionmentioning

confidence: 99%

Study on the Effect of Recycled Fine Aggregate Qualities on Fly Ash/GGBS-Based Geopolymer Mortar

Liu,

Takasu

et al. 2023

Materials

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The rapid expansion of construction, fueled by industry and economic and population growth, has exacerbated the challenge of managing construction waste, especially concrete waste. One promising solution lies in the utilization of recycled fine aggregate (RFA), especially in combination with the emerging geopolymer technology, an innovative alternative to traditional cement. This study systematically explores the effects of incorporating varying qualities and quantities of RFA into geopolymer mortars. By using GGBS and FA as raw materials and replacing natural aggregates (NA) with RFA at different rates (25%, 50%, 75%, and 100%), the research investigates the fresh properties, mechanical characteristics, and drying shrinkage of geopolymer mortar. Key findings reveal that RFA significantly influences the flowability of geopolymer mortar: when RFA content is above 75%, preprocessed RFA (with particles below 0.15 mm removed) has substantially improved flowability, increasing it more than 20%. The critical impact of RFA preprocessing on enhancing mechanical properties and the higher the inclusion level (above 75%), the more pronounced is the advantage in enhancing the compressive strength compared to unprocessed RFA. Additionally, RFA was found to contribute to a denser interfacial transition zone (ITZ) than natural aggregate, which helps maintain the compressive strength at increased RFA dosages. Contrary to findings in cement mortar, a positive correlation exists between pore volume and compressive strength in geopolymer mortar incorporating RFA. This study underscores the potential of refined RFA preprocessing methods in advancing sustainable construction, highlighting avenues for the broader application of RFA in geopolymer mortar.

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Life Cycle Analysis of High Quality Recycled Aggregate Produced by Heating and Rubbing Method

Cited by 10 publications

References 2 publications

An Advanced Concrete Recycling Technology and its Applicability Assessment through Input-Output Analysis

An Advanced Concrete Recycling Technology and its Applicability Assessment through Input-Output Analysis

Inventory Data and Case Studies for Environmental Performance Evaluation of Concrete Structure Construction

Study on the Effect of Recycled Fine Aggregate Qualities on Fly Ash/GGBS-Based Geopolymer Mortar

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