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It is a good way to use recycled aggregate produced by waste concrete to replace natural aggregate to prepare Recycled Aggregate Concrete (RAC), which improves the recycling rate of CDW and reduces the pressure of over-exploitation of natural resources. ... Therefore, in the preparation of recycled concrete, the adjustment of the water-cement ...
A green, low-carbon concrete is a top way to recycle waste in construction. This study uses industrial solid waste slag powder (S95) and fly ash (FA) as binders to completely replace cement. This study used recycled coarse aggregate (RCA) instead of natural coarse aggregate (NCA). This is to prepare …
Afterwards, the aggregate was poured into concrete blocks, thereby obtaining the same strength as natural granite aggregate. Yi Jiang [22], by using 100 % basic oxygen furnace slag as raw material, prepared artificial aggregate with different accelerated carbonation methods. ... Many studies also explored the preparation of aggregate with other ...
1. Background. Concrete is the most-used building material globally, with global consumption of about 12 billion tons annually [].Concrete generally comprises 10–20% cement, 70–80% natural aggregate (NA), and 5–10% water by mass [].The massive demand for concrete has led to the overexploitation of high-quality river sand and gravel.
a,b Coarse aggregates and Fine aggregates in saturated surface dry condition c BC = Brick aggregate concrete, RA = Recycled aggregate concrete, SA = Natural aggregate concrete …
This investigational study aims to examine the influence of using recycled coarse aggregate (RCA) instead of natural coarse aggregate (NCA) on the fresh properties (workability) and mechanical ...
Although the bonding strength of natural adhesives has been improved to a certain extent through modification and cross-linking [[29], [30], [31]], enabling them to reach >2 MPa, the vast majority still struggle to achieve the bonding strength of traditional petroleum-based wood adhesives (typically exceeding 5 MPa).In addition, most natural adhesives require high curing …
Artificial aggregate preparation. As shown in Fig. 2, three aggregates (N, C, and D) were prepared, ... Compared with the natural aggregate, the artificial one has a higher porosity and will absorb more free bitumen while preparing the asphalt mixture. This study used the liquid silicone resin to treat the artificial aggregates to decrease ...
1. Introduction. Due to the enormous consumption of concrete in construction industry, more than 349 million tons of aggregate are consumed annually [1, 2].Since it has become necessary to find alternative materials nowadays [3, 4], the application of sea sand and coral sand in concrete preparation is a popular research topic [[5], [6], [7], [8]].Li et al. [[9], …
Table 1, Table 2 present the chemical composition of EM and fly ash utilized in this study, as well as the physical properties of MPC. Fig. 1 illustrates the preparation process of EM and fine aggregate at the construction site of Yichang High-speed Railway North Station. BC is produced from agricultural waste straw through hypoxic pyrolysis at 550°C and then sieved …
Natural aggregate sources and production This book focuses on the nature and performance of aggregates in concrete. It emphasizes the interaction between matrix and aggregate phases, and how this interaction governs properties of the composite material. Before discussing the properties of aggregates themselves and their performance
In the South African province of KwaZulu-Natal, stone dust (aggregate) is used for construction. The parent rocks to which these stone dust (aggregate) are produced and their by-products are known to contain significant concentrations of primordial radionuclides 238 U, 232 Th, and 40 K of natural origin [Citation 17]. The presence of these ...
To promote resource reuse and the green, low-carbon transformation of the construction industry, this study uses recycled aggregate from crushed waste concrete and natural bamboo fibers to formulate bamboo …
Preparation and Properties of Natural Bamboo Fiber-Reinforced Binyu Xu, Rongxi Tian, Ying Wang, Zhen-wen Zhang * and Zihua Zhang School of Civil & Environmental Engineering and Geography Science ...
Natural Aggregates: These are obtained naturally from rocks including metamorphic, igneous, and sedimentary types. They are extracted from large rocks by an …
Preparation method and applicability evaluation of 3D alumina ceramic artificial coarse aggregate, Yake Zhang, Xi Li, Kaikai Hu, Guoping Qian, Xiangbing Gong, Huanan Yu ... with resin materials and found that the macroscopic profile of the aggregate was the same as that of the natural aggregate. Volumetric indicator deviation ...
Preparation of articial aggregate using aste concrete powder and CO 2 xed by… 1455 1 3 for using waste concrete to alleviate the shortage of natural aggregate. Materials and methods Raw materials Waste concrete powder and particle WCP and WCAP were made by crushing concrete with a jaw crusher, grinding by a centrifugal mill, and sieving. The ...
This is mainly because when WA is used as coarse aggregate to replace natural aggregate in the preparation of WARC, its own lightweight and high water absorption directly lead to the reduction of the compressive strength of WARC as the volume content of wood aggregate increases. Meanwhile, in the process of preparing WARC, the wood aggregate ...
The constant and rapid increase in CDW generation and the usage of natural aggregate in concrete manufacturing are two of the biggest environmental problems facing the construction sector (Marinković et al., 2010). Using recycled aggregate concrete (RAC) made from CDWs is an option for a sustainable concrete. The utilization of RAC offers a ...
The construction waste can be used as recycled aggregate (RA) to replace natural aggregate after crushing and screening (Wang et al., 2021; Kim, ... steel fibers commonly used in structural components are difficult to adapt to the preparation and working environment of PC. At the same time, ...
Lightweight aggregate (LWA) is defined as solid substance with an apparent density of less than 2.0 g/cm 3 and a bulk density of less than 1.2 g/cm 3 1.LWAs are porous and often granular materials ...
Solid waste used as aggregate can not only decrease the consumption of natural aggregates but also reduce the space for landfill treatment [19]. However, the former method has many disadvantages, such as the continuous leaching of hazardous substances from solid waste, which can jeopardize the building structure and the natural environment [20] .
Preparation of gold nanoparticles. Timing ∼ 1 d. 1. Prepare aqua regia by mixing 3:1 concentrated HCl:HNO 3 in a large beaker in a fume hood.. CAUTION Be extremely careful when preparing and ...
After rinsing and drying and secondary screening, the RCA with good gradation obtained from the separation was set aside. The preparation procedure of RCA is depicted in Fig. 1, and the basic properties are illustrated in Table 2. Natural river sand with good gradation serves as the fine aggregate (FA) in the experiment.
Replacement of Natural Coarse Aggregate by Industrial Steel Slag In Road Construction Yogesh Patil 2019, International Journal of Engineering Development and Research
This protocol describes the preparation of long-lasting aggregation-induced emission-based, near-infrared afterglow luminescence nanoprobes. Their enhanced afterglow intensity results in improved ...
This provides an idea for the use of recycled aggregate, including BC-RA, to replace natural aggregate in the preparation of pervious concrete. However, due to the unique material and structural composition of pervious concrete, the strength of aggregate itself largely determines the strength of pervious concrete.
The emissions of construction and demolition (C&D) waste have been increasing worldwide in recent years. As shown in Fig. 1, China alone had over 3 billion tonnes of untreated C&D waste in 2020 [1].To promote sustainability in the construction industry, one technique that has been extensively explored is the use of recycled aggregates derived from waste concrete …
Concrete is the most widely used construction material. With today's rapid urbanization, the world produces about 30 billion tonnes of concrete annually, which is three times more than 40 years ago on a per capita basis [1].The manufacturing process of concrete necessitates significant quantities of cement, natural sand (NS), and natural coarse …
The largest single use of natural aggregates is in construction, and much of that aggregate is used in portland-cement concrete or bituminous mixes. Sand and gravel deposits are accumulations of durable rock fragments and mineral …