grinding method for recycled aggregate

Improvement of recycled aggregate properties through a
2022year8month1day Five types of concretes were prepared in this experiment: normal concrete (NC), recycled aggregate concrete (RC), and concretes made from treated recycled mixed aggregates using mechanical grinding, MICP, and combined method.
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A novel treatment method for recycled aggregate and the
2021year1month1day The main mechanical methods include mechanical grinding, selective heat grinding, and heat grinding [32]. However, although these methods can reduce the water
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Enhancement technologies of recycled aggregate
2022year1month24day To further improve the quality of RA, the Japanese company Mitsubishi proposed the heating grinding method. The heating temperature is usually approximately
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Improvement of recycled aggregate properties through a combined method ...
2022year8month1day To enhance the properties of recycled mixed aggregates (RMAs), three different treatment routes were adopted in this work: mechanical grinding, microbial
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Treatment Methods for the Quality Improvement of
2021year1month24day the quality improvement of RCA, in this paper, various treatment methods were firstly classified into four categories: removing old mortar (OM), strengthening OM,
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Influence of acetic acid soaking and mechanical grinding
2022year2month22day Recovering aggregate from this waste can help to solve (i) to protect the resources of natural aggregates, (ii) to utilize RA in constructions, (iii) to reduce the
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Methods for Improving the Microstructure of Recycled
2021year10month11day of the recycled aggregate, to improve the nanomechanical properties of the interfa-cial transition zones, removal or strengthening of weak parts or weak mortar
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(PDF) A Mechanical Treatment Method for Recycled
2021year4month24day PDF Recycle concrete aggregates (RCA) consist of natural aggregates and remnant mortar adhered to their surface. The amount, size, and morphology of...
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Enhancement Treatment of Recycled Concrete Aggregate
2021year7month22day However, the pre-soaking method increases the production cost and the grinding method easily forms micro-cracks which damages the RCA structure. Accordingly, enhancing the adhered mortar performance receives extensive attention comprising the following practical solutions.
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A Mechanical Treatment Method for Recycled Aggregates
When incorporating recycled fine aggregates, and particularly at a replacement content of 25% by mass, the compressive and tensile strengths of concrete mixtures were the
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Methods for Improving the Microstructure of Recycled Concrete Aggregate ...
2021year10month12day This study examines various kinds of recycled aggregate treatment methods which can be used to improve the microstructural properties. The databases of ScienceDirect, Gale, Springerlink and the keywords of ‘mixing approaches for recycled concrete aggregate’, ‘CO 2 effects on concrete’, ‘self-healing of recycled concrete
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High-quality coarse aggregate recycling from waste concrete
2020year1month29day This study presents a liberation process for recycling high-quality coarse aggregates from waste concrete by impacting with steel grits. Considering the mortar liberation ratio and specific energy for the liberation process as well as the water absorption and apparent density of the recycled coarse aggregates (RCA), the effects of impact
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A Mechanical Treatment Method for Recycled Aggregates
The treatment method was based on the mechanical grinding of the adhered mortar from the surface of the RCA. The aggregates were placed inside a 100 L capacity concrete drum mixer along with water, where the rotating motion allowed the aggregates to collide with each other and with the metal walls of the drum. ... Ding B. Comparison of recycled ...
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Summary of research on pretreatment methods of
①Vertical eccentric high speed grinding method and horizontal rotary grinding method Japan is relatively advanced in the process of processing RA. It mainly uses vertical eccentric and horizontal rotary devices. The working principle of the vertical eccentric wheel high-speed grinding method is shown in Figure 1. The preliminarily broken concrete
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Enhancement technologies of recycled aggregate
2022year1month24day The heating temperature is usually approximately 500℃ when the regenerative aggregate is enhanced by the heating grinding method. Under the action of high temperature, Ca(OH) 2 in cement stone is decomposed into CaO, and C-S-H gel is dehydrated at the same time, which dehydrates and embrittles cement stone and
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Methods for Improving the Microstructure of Recycled
2021year10month11day of recycled aggregate by, mechanical grinding, heat grinding, pre-soaking in water, pre-soaking in acid, micro-wave assisted removal of mortar, spraying of immersion ... This study examines various kinds of recycled aggregate treatment methods which can be used to improve the microstructural properties. The databases of ScienceDi-rect, Gale ...
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Quantitative Analysis of Surface Attached Mortar for Recycled
2021year12month30day The optimum calcination temperature of the recycled coarse aggregate was 400 °C and the grinding time was 20 min. The contents of the attached mortar in recycled coarse aggregates of Class I, II, and III were 7.9%, 22.8%, and 39.7%, respectively. ... Qiang, Z.E. Summary of research on pretreatment methods of recycled Aggregate.
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Quantitative Analysis of Surface Attached Mortar for Recycled
2021year12month30day The calcining-grinding method can effectively separate the recycled aggregate and attached old cement mortar. The calcination temperature below 100 °C had no great influence on the aggregate. When the temperature was 400 °C, the microhardness decreased to 245 MPa, and the hardness loss rate was 14.6%. The hardness of the
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Study on the impermeability of recycled aggregate
2023year10month15day Permeability is a critical property of recycled aggregate concrete (RAC), affecting the durability and service life of structures. The impermeability of RAC can be improved by improving compactness, adding fibers and admixtures, and internal curing. Adopting only one approach may reduce other RAC properties. Therefore, two methods
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Quantitative Analysis of Surface Attached Mortar for Recycled
2021year12month30day The optimum calcination temperature of the recycled coarse aggregate was 400 °C and the grinding time was 20 min. The contents of the attached mortar in recycled coarse aggregates of Class I, II, and III were 7.9%, 22.8%, and 39.7%, respectively. ... Qiang, Z.E. Summary of research on pretreatment methods of recycled Aggregate.
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Mechanical properties of recycled aggregate concrete
2023year10month1day The study examines the impact performance of recycled aggregate concrete (RAC) comprising different replacement levels (10, 20, 30 and 40 %) of recycled aggregate (RA). Three concentrations (10, 15, and 20 %) of MgSO 4 solution were used to pre-treat the RA and subjected to three different immersion times of 5, 10, and 15 days.
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Performance evaluation of concrete made with double-processed recycled ...
2023year1month16day The depletion of natural aggregate sources has increased exponentially due to the enormous demand for concrete. Therefore, the recycled aggregate (RA) extracted from old concrete structures may reduce the demand for natural aggregate (NA). This paper introduced a new double processing technique that combines mechanical grinding in the
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(PDF) Modification on Recycled Aggregates and
2019year9month6day This paper introduces current modification methods on the recycled aggregates, which mainly include: (1) physical technology, its basic idea is to remove the waste cement paste adhered to recycled ...
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Improvement of recycled aggregate properties through a combined method ...
2022year8month1day The proposed combined mechanical grinding and MICP method exhibited better influence on the compressive strength of RCs, as compared to the other methods. ... Characterization of recycled aggregate by the combined method: acid soaking and mechanical grinding technique. Materials Today: Proceedings, 49 (2022), pp. 230-238.
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Characterization of recycled aggregate by the combined method
2022year1month1day A portion of adherent mortar remains attached to the recycled aggregate, a thin, more brittle, and cracky layer after old concrete has been crushed. [23]. The primary constraint for producing good quality (medium to high strength concrete) is the requirement of high quality treated recycled aggregate (TRA).
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Quality improvement of recycled aggregate - ScienceDirect
2023year1month1day Method of treating recycled aggregate proposed by Tam et al. (2007), consists of presoaking the recycled aggregate in acids, respectively: HCl, H 2 SO 4, and H 3 PO 4, to reduce the amount of old cement mortar. These methods to varying degrees improve the properties of recycled aggregate, specially by reducing its water absorption
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Enhancement Treatment of Recycled Concrete Aggregate
2021year7month22day Enhancement Treatment. To improve the performance of RCA, removing the adhered mortar is verified as a useful approach including pre-soaking in acid and mechanical grinding. However, the pre-soaking method increases the production cost and the grinding method easily forms micro-cracks which damages the RCA structure.
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Removal of cement mortar remains from recycled aggregate
2007year3month1day Recycled coarse aggregate was pretreated with nano-silica solution and cement slurry by Liang et al. (2015), and the 28 days compressive strength of recycled coarse aggregate concrete increased ...
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Performance enhancement of recycled concrete aggregate –
2016year1month20day This paper reviews the published enhancement methods for recycled concrete aggregate, and points out their advantages and disadvantages so as to facilitate the selection and further development of suitable enhancement methods for recycled concrete aggregate. ... Mechanical grinding is a popular treatment because of the simple
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Use of recycled fines from waste concrete as an admixture in
2022year1month1day The recycled powder obtained from sieving fine recycled aggregate has a greater porosity than recycled powder obtained from grinding it. The effect of the recycled powder on the water demand and setting time depends on the fineness, porosity, and water affinity of the recycled powder. Better properties are achieved when the recycled powder
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