An industrial applicable method to improve the properties of recycled aggregate concrete by incorporating nano-silica and micro-CaCO3

Yue, Yanchao; Zhou, Yingwu; Xing, Feng; Gong, Guoqiang; Hu, Biao; Guo, Menghuan

doi:10.1016/j.jclepro.2020.120920

Cited by 85 publications

(20 citation statements)

References 60 publications

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“…Furthermore, RCA with a higher water absorption will render a serious micro-bleeding effect in the ITZ-3, which will widen the ITZ-3 and reduce its Vickers micro-hardness (VMH) [10,11]. In fact, ITZ is the weakest phase in RAC, and it plays a crucial role in affecting the mechanical properties and durability of RAC [12,13].…”

Section: Introductionmentioning

confidence: 99%

Effects of Carbonated Recycled Concrete Aggregate on Mechanical Properties of Concrete and Micro-Properties of Interfacial Transition Zone

Wu¹

2022

Ceramics - Silikaty

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The purpose of this paper was to study the effects of carbonated recycled concrete aggregates (CRCA) on the mechanical properties of recycled aggregate concrete (RAC) and the micro-properties of the interfacial transition zone (ITZ), and to determine their strengthening mechanisms. Recycled concrete aggregate (RCA) soaked with saturated lime water was treated by accelerated carbonation under a pressure of 0.30 MPa for 24 h, under the replacement ratios of 0 %, 30 %, 70 %, 100 %. The mechanical property tests included 7-day and 28-day compressive, splitting tensile, and flexural strength tests. The micro-property tests included scanning electron microscope-energy dispersive spectrometer (SEM-EDS), X-ray diffraction (XRD), and Vickers micro-hardness (VMH). The results showed that the pores of the old mortar (OM) and ITZ-2 in the CRCA were filled with calcite, which improved the properties of the CRCA. Therefore, with the replacement ratio of the CRCA, the improvement degrees of the mechanical properties of the RAC gradually increased. Furthermore, compared to the other phases in the RAC, ITZ-3 had the lowest properties, but had the highest improvement degree. Besides, the strengthening mechanism of the micro-properties of ITZ-3 by the CRCA can be explained by the nucleation and chemical effect of the calcite and the micro-bleeding effect of the ITZ-3. Namely, the calcite on the surface of the CRCA provided nucleation sites for the calcium silicate hydrate (C-S-H) and reacted with the aluminate in the ITZ-3 to form hemicarbonate (Hc) and monocarbonate (Mc). In addition, a decrease in the water absorption of the CRCA alleviated the micro-bleeding effect of the ITZ-3.

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Section: Introductionmentioning

confidence: 99%

Effects of Carbonated Recycled Concrete Aggregate on Mechanical Properties of Concrete and Micro-Properties of Interfacial Transition Zone

Wu¹

2022

Ceramics - Silikaty

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“…Stakeholders appropriate to RCA utilization, including the general public, transportation firms, construction waste disposal organizations, construction firms, local govern-ments, developers, and central government agencies, should work together to realize the full potential of RCAs [63]. This work suggests that there should be recommendations to foster the recycling of construction and demolition wastes and utilization of RCA, applications and prices of construction and demolition recycled materials such as RCA, RCA promotion, and construction and demolition recycling awareness.…”

Section: Restructuring the Public And Private Sectors To The Utilization Of Rcamentioning

confidence: 99%

“…This work suggests that there should be recommendations to foster the recycling of construction and demolition wastes and utilization of RCA, applications and prices of construction and demolition recycled materials such as RCA, RCA promotion, and construction and demolition recycling awareness. Including sector and information technology and finance, environmental protections, transport, municipal administration and landscapes, planning, housing and construction, land resources, development, and reform commission, the RCA management of local governments involves various departments of government administration with their respective management responsibilities and privileges [63]. In most cases, the urban administration department of China is the main construction and demolition waste agency.…”

Section: Restructuring the Public And Private Sectors To The Utilization Of Rcamentioning

confidence: 99%

Capacity to Develop Recycled Aggregate Concrete in South East Asia

et al. 2021

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The global sustainable construction aimed to minimize the ecological impacts of constructed facilities’ lifetime. In construction, concretes are the major materials utilized in South East Asia. Thus, it makes environmental and economic sense to utilize recycled materials in the production of new concretes for diverse uses. This review indicated that the practical implementations of the recycled aggregate concretes (RAC) in the area is greatly lacking, even though there are reasonable studies on RAC, particularly because of lack awareness and economic viability of such uses at the present period. This research aims to establish an interdisciplinary consortium with researchers, policy makers, practitioners, and social scientists in Southeast Asia to investigate the development of sustainable, durable, cost-effective, green concrete by utilizing recycled aggregates. Concentrating on waste resource recovery, this research presents an integrated modeling method. The approaches track and forecast a variety of values across technical, economic, social, and environmental areas linking these to the material flow and therefore integrating and building upon one-dimensional models like life cycle assessments (LCAs) and material flow analyses (MFAs). Additionally, the analysis of this study supported the recycling of cement for general use in construction, emphasizing the feasibility, reliability, and longevity of a project at the same time. However, the analysis also demonstrated that although there is fair progress on recycled concrete, there is still a severe lack of appropriate development in particular because of the lack of economic sustainability and knowledge of such applications at present. Raw material conservations were recorded; carbon dioxide costs and footprint were also reduced. Considering the RAC economic, technical, and environmental parameters, frameworks were applied for sustainable selections with target compressive strengths as the major goal.

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“…High transmittance is also important for soft PVC composite film in packaging and agricultural applications 9 . However, incorporation of excessive filler can make the PVC composite film become gray and white and thus reduce the transparency 10 . Wang et al 11 found that the polypropylene composite filled with calcium carbonate had a transmittance of only 40.7% in the visible range.…”

Section: Introductionmentioning

confidence: 99%

Preparation and properties of transparent powder filled soft poly(vinyl chloride) composite film with high transparency

Wang

2021

J of Applied Polymer Sci

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In this study, transparent powder (TP) with a refractive index similar to that of poly(vinyl chloride) (PVC) was used as inorganic filler to prepare PVC composite film with high transparency. TP was modified with γ‐methylacryloxypropyl trimethoxy silane (KH570) and characterized by Fourier transform infrared spectroscopy, X‐ray diffraction, and Zeta potential analysis. Then, KH570 modified TP was incorporated into PVC, and its effects on the mechanical, transparent, and thermal properties of soft PVC composite film were investigated by tensile test, transmittance measurement and thermogravimetric analysis. The results show that the optimum loading of modified TP is 7.5 phr (mass), at which the breaking strength (18.5 MPa) and elongation at break (669.5%) of the composite film are 60.9% and 54.0% higher than that of pure PVC film, respectively. The highest light transmittance is 85.6% at a filler loading of 5 phr. Thus, TP filled PVC composite film has excellent mechanical transparent properties and high transparency.

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An industrial applicable method to improve the properties of recycled aggregate concrete by incorporating nano-silica and micro-CaCO3

Cited by 85 publications

References 60 publications

Effects of Carbonated Recycled Concrete Aggregate on Mechanical Properties of Concrete and Micro-Properties of Interfacial Transition Zone

Effects of Carbonated Recycled Concrete Aggregate on Mechanical Properties of Concrete and Micro-Properties of Interfacial Transition Zone

Capacity to Develop Recycled Aggregate Concrete in South East Asia

Preparation and properties of transparent powder filled soft poly(vinyl chloride) composite film with high transparency

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