Figure 2c and d show the Los Angeles abrasion and crushing index of coarse aggregates. As the recycling cycle increases, there is a corresponding increase in both …
In the present study, we investigated the mechanical performance of concrete composed of non-selected construction and demolition waste (C&DW) sourced from both old and new sections of an inactive waste landfill site in Karaj, Iran. Initially, we determined the composition of the coarse and fine C&DW used in concrete production. …
On the other hand, sustainable development requires the construction industry to upcycle construction and demolition (C&D) waste into value-added products. ... The effective water-to-cement ratio and the cement-to-aggregate ratio of the mortar specimens were 0.5 and 1:3 respectively (Table 4). It should be noted that for the …
In the construction, the cost of building materials are rising day by day.the use of alternative material is a partial replace of coarse aggregate in solving part of natural aggregate. The various waste materials are used such as coconut shell, cockle shell, periwinkle shell, foundry sand etc. so here in my project I will use coconut shell ...
Since the water absorption of E-waste aggregates is almost zero as compared to the natural coarse aggregates, in this study, a water-to-cement ratio of 0.5 was used to avoid high slump and or ...
The sludge was greyish-black or black, with plastic flow properties. Its basic physical properties and particle size composition are shown in Table 1, Table 2. The waste concrete fine aggregate (referred to as fine aggregate) was from construction demolition waste concrete in Wuhan, and the particle size was 0–2.36 mm.
Concrete Mix Ratio. To make concrete, you'll need four basic ingredients: cement, sand, aggregate, water, and additional mix. Concrete mix design is the method of determining the correct proportions of cement, fine aggregate (sand), and aggregates for concrete to achieve the target strength of the prepared concrete mix.. The advantage of the …
This paper presents a literature review on the generation, recycling, and applications of construction and demolition waste (CDW) aggregates. It discusses the physical-chemical and mechanical …
Ceramic tiling ware is an essential component of construction materials in buildings and homes nowadays (Nara et al., 2014; Subedi, 2013).The importance of having or employing ceramic materials in any building or residence has become one of the trends that today's market must quickly adapt to (Ali & Al-Kodmany, 2012).To meet the …
Recycled fine aggregate from C&D waste was obtained from a construction waste disposal plant in Beijing, China (Fig. 1). The most prominent feature of C&D waste from Beijing is the large amount of red brick, as compared with those from other areas such as Hong Kong, the United States and Turkey [5], [24], [25]. ... cement-to …
In this study, the strength and fracture parameters of slag-based geopolymer mortar (SGPM) using different molarities of sodium hydroxide and different percentages …
The examination of plastic waste's physical properties has been the subject of numerous studies to ascertain the potential employment of these wastes as either fine or coarse aggregates [21, 39].Evram et al. [40] conducted a study on the impact of E-plastic waste as aggregates on the mechanical strength of concrete.Using sieve analysis, they …
More studies are required to determine the effects of using recycled fine to recycled coarse aggregate ratios for a mixed design of recycled concrete and how these ratios can affect the freshness and mechanical properties of recycled concrete. ... Jeffrey JW (2021) Utilization of recycled aggregate of construction and demolition waste as a ...
Mechanical properties of concrete containing recycled aggregate from construction waste. Author links open overlay panel Indrajit ... The ratio of water to cement in this concrete is 0.56, and the percentage of recycled large aggregates to natural and fresh large aggregate ranges from 0 to 60, with 20 and 30 being the least recycled …
The aim of this research includes studying the effect of using construction waste as coarse aggregate with various replacement ratios (0, 10, 20, 30, 40, 50, 60, …
With the acceleration of urban construction, a large amount of waste concrete is generated during the demolition and new construction process. ... Therefore, improving the aggregate mix ratio and preparation process to obtain energy-saving and high-performance artificial aggregates is the current urgent problem to be solved.
The use of construction waste as a source of aggregate for the production of new concrete has become more common in recent years. ... The addition of polymer modification resulted in a slight decrease in total void ratio regardless of type of aggregate. The total void ratios were achieved within the acceptable range of 22–28% for recycled ...
Based on Eurostat – European Statistical Office, European Union is the source of around 895 400 t of waste per year (waste from mining not included) [24].About a third comes from the civil engineering sector [25] and so having a huge influence on the final score. Wastes from mineral excavation in Poland in 2022 are forecast at 64 300 …
The effect of the coupling effect of fineness modulus and water-binder ratio on the UCS of TWSC is shown in Fig. 11. The UCS gradually increases with the decrease of the water-binder ratio and the increase of fineness modulus. The UCS has a maximum value of 22.22 MPa when the water-binder ratio is 0.45 and the fineness modulus is 4.0.
Concrete waste (CW) recycling stands as a promising strategy to promote sustainable construction practices. This research aims to assess the feasibility of using recycled concrete aggregates (RCA) as a surrogate for natural aggregates (NA) in concrete applications and reduce the environmental impact associated with the …
The use of construction and demolition waste recycled aggregates (CDW-RA) as a replacement for natural aggregates (NA) in the pavement construction industry is by far the most common …
Natural aggregates occupy 60-75 percent in volume of the concrete matrix. It is beneficial to recycle construction and demolition waste, for construction activities. One such …
The composition of CDW aggregate depends on the type of construction demolition waste used to prepare this type of aggregate. A typical CDW aggregate prepared from normal concrete block contains 65–70 % of coarse and fine sized normal aggregates and 30–35 % of cement paste (Poon et al. 2004a, b).The CDW aggregate …
The excellent results had enabled changes in the 2014 edition of Qatar Construction Specification (QCS) to allow a maximum recycled aggregate replacement …
The results show that construction waste management systems have been enacted and revised in line with social needs, and each stakeholder is making an effort to use the construction waste practically.
One approach to mitigate the impact of sand extraction is the recycling of construction demolition waste (CDW) and its reuse in construction activities. ... Two distinct binder-to-fine aggregate mix ratios, namely 1:1 and 1:3, were taken into consideration. The study employed sodium hydroxide (NaOH) and sodium silicate …
Mohammed et al. [10] studied the influence of replacing natural fine and coarse aggregates with waste glass aggregates (at the replacement ratios of 0%, 5%, 10%, 15%, and 20% by volume) on the ...
The global demand for construction quality aggregates is expected to be more than 51 billion metric tons by 2019 [1].The mining, processing, and transport operations for such a large quantity of aggregates consume a huge amount of energy and adversely affect the ecology of the areas and riverbeds [2].Ever increasing demand for …
The water–cement ratio (w/c) has a significant effect on the strength of recycled concrete. In this study, considering the effects of water/cement ratio, strength, and water content of recycled aggregates, two kinds of pulse sequences of low-field nuclear magnetic resonance (LF-NMR) were applied to investigate the water migration behavior …
When used as aggregates to substitute coarse aggregate, this constitutes a positive response to global sustainable resources materials it would reduce extraction of natural materials such as limestone [13], [24], [25], [26]. 7. Conclusion. Concrete is a premier construction material consisting of natural aggregate.
In this review study, the latest updates on plastic waste utilisa-tion as aggregate in various construction materials are presented. Although plastic waste usage in construction material is advanta-geous from the environmental perspective, however, the proper-ties of construction materials required further investigation to
The waste from construction and demolition works are of large volume and increasing in time. This study was implemented to determine the effect of superplasticizer on the mechanical properties of ...
This article provides a comprehensive review on recycled aggregate (RA) and recycled aggregate concrete (RAC) regarding their history, recycling, reuse, …
Reinstating of fine aggregates in a concrete is studied with five incremental ratios such as 20, 40, 60, 80, and . Since debris are coated with fine cementitious particles, the water absorption potential will be high. ... S. P., Puneeth, H. C., & Rohith, M. (2017) Characterization of construction and demolition waste aggregates for rigid ...
The European Union also produces over 450 million tons of CD waste [8]. In Malaysia, the construction sector is responsible for the generation of 16.6 million tons of waste as reported in 2007 and ...
REUCRETE: "Replacement of Fine Aggregate by Demolished Waste ... construction, aggregates are important components for all ... Maximum water-cement ratio 0.50 Workability for pumping at site as per IS-4926 170 – 180 mm Tolerance factor (t) 1.65 Exposure condition Severe ...
Construction waste is defined as relatively clean, heterogeneous building materials generated from the various construction activities. ... It was tested by keeping the cement and fine aggregate ratio constant. The absolute volume method was adopted to design the M25 Grade concrete as per Indian Standard code of practice …
This article summarizes the physical and mechanical properties of recycled aggregate concrete (RAC) with waste concrete and brick as coarse aggregate, and …
This shows potential for reducing construction waste 6. ... 1.15 parts sand, 3.15 parts coarse aggregate, and a water/cement ratio of 0.32. Mass relative incorporated 8% silica fume and 0.08% ...