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This study aims to compare the potential environmental impact of the manufacture and production of recycled and by-product aggregates based on a life cycle assessment and to evaluate the environmental impact and cost when they are used as aggregates in concrete. To this end, the six potential environmental impacts (i.e., abiotic …
Concrete is a major material used in the construction industry that emits a large amount of substances with environmental impacts during its life cycle. Accordingly, technologies for the reduction in and assessment of the environmental impact of concrete from the perspective of a life cycle assessment (LCA) must be developed. At present, the …
The porosity of an aggregate permits the aggregate to absorb asphalt and form a bond between the particle and the asphalt. Adegree of porosity is desired, but aggregates that are highly absorbant are generally not used. 8. Stripping.When the asphalt film separates from the aggregate because of the action of water, it is called stripping. Aggregates
This study investigates the feasibility of using recycled concrete aggregate (RCA) as a partial substitution of natural aggregate in pavement engineering. Despite RCA's good properties, such as polishing value and freeze-thaw resistance, its use is limited by low resistance to fragmentation and high-water absorption. This paper parent the …
Currently, a number of disadvantages hampers the use of recycled concrete aggregates (RCA). The current review proves that concretes made with complete replacement of natural aggregate with RCA allow the production of high-quality concrete. One of the possibilities for improving concrete properties with RCA is the use of extended …
The LCA approach is a methodology widely used in waste management studies to find the best option in terms of environmental and economic impact. In [8], the authors used LCA results from different ...
The formed material binding property produced good aggregate strength. At 1400°C temperature, the new pellets are healed in coerced drenched vapour. This method gave fast aggregate production with a minimal binding material and curing time[12]. 2.2.3. Cold bonding. In this method, normal curing water at room temperature was used. At …
The exact equipment and machinery needed may vary depending on the specific operation and the type of sand and gravel being processed, but some common …
Concrete production consumes enormous amounts of fossil fuels, raw materials, and is energy intensive. Therefore, scientific research is being conducted worldwide regarding the possibility of using by-products in the production of concrete. The objective is not only to identify substitutes for cement clinker, but also to identify materials …
However, it is important to assess the global impacts of this replacement, in both environmental and economic terms. In this study, an overview of the impacts of the production of natural and recycled …
1. Natural lightweight aggregate: natural rock that had been crushed, for instance, pumice, scoria, tuff, breccias, and volcanic cinders. 2. Manufactured structural aggregates: by …
The machine used and the setup of the testing shown in Fig. ... The used natural aggregates are well sieved, washed, and dried. recycled aggregate was used after being well dried until constant mass. ... K., Dosho, Y., Narikawa, M., Kikuchi, M.: Application of recycled aggregate concrete for structural concrete. Part 3-production of recycled ...
the quantities of inputs and the efficiency or productivity with which they're used. Doing this for an entire economy takes a leap of faith, but the reward is a quantitative summary of the sources of aggregate economic performance. The production function Economic organizations transform inputs (factories, office buildings, machines, labor
A. Recycled Aggregate Concrete. Recycling is the act of processing the used material for use in creating a new product. The usage of natural aggregate is getting more and more intense with the advanced development in infrastructure area. Recycled aggregate is comprised of crushed, graded inorganic particles processed.
There have been efforts to use building demolition waste as an alternative aggregate in concrete to decrease the use of natural resources for construction. The World Green Building Council estimates …
There are two types of lightweight aggregate, which are natural lightweight aggregate and artificial lightweight aggregate. The following are the two types of lightweight aggregate: Aggregates that …
The widespread use of natural aggregates is one of the main causes of the depletion of natural resources, as aggregates are constituents of several construction materials. Alternatively, it is, today, proven to be feasible to use mining tailings, either natural or recycled materials, to produce artificial aggregates through specific processes. …
Lightweight aggregates is a definition for porous mineral aggregates with a density less than 2000 kg/m 3 and a bulk density up to 1200 kg/m 3 (according to PN-EN 13055:2016-07 []).Nowadays, lightweight aggregates can be classified into several groups depending on the type of raw materials used for production: a group of aggregates of …
Artificial aggregates obtained from by-products of industries used as an alternative coarse aggregate are now gaining research interest [1]. According to various reports, it has been predicted that concrete production will rise up to 18 billion tons per year by 2050 [52]. Since aggregate contains 70%–80% of the volume of concrete, it will ...
The paper deals with the use of vibro-compressed units with bio-natural components on construction. The proposed mix design of vibrated blocks consist of cork granules and/or hemp shives, with the aim to substitute polymeric elements or expanded clay, together with the use of natural hydraulic lime (NHL) as binder. An experimental …
Aggregate Processing. During processing, aggregates are distilled down to a level of their most common use. Some aggregates may be crushed to a powder while others may be screened to various diameter chunks. The proper processing of aggregates is important in maintaining their desirable qualities. For instance, between 60 and 75 …
Geological occurrences of natural aggregates (different possibilities since natural aggregates are generated by a great variety of geologic processes) are then …
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.
Various researchers are developing efforts to integrate waste and by-products as alternative materials in road construction and maintenance, reducing environmental impacts and promoting a circular economy. Among the alternative materials that several authors have studied regarding their use as partial or total substitutes for …
Aggregate production methods can be classified under the following three categories: Obtaining natural aggregates from quarries (the first scenario). Obtaining recycled aggregates from C&D waste in recycling plants (the second scenario). Combined method (the third scenario). See more
This study proposes to use a basalt powder and two different metakaolins as precursors for the production of an alkali-activated artificial aggregate, with a specific shape and size achieved by using 3D-printed …
Figure 1. Waste concrete for recycling: concrete cubes and precast column. Figure 2. Recycled material after (a) primary and (b) secondary crushing. Crushed concrete particles were separated into standard fractions of coarse aggregate (4–8 mm, 8–16 mm and 16–31.5 mm), as seen in Figure 3. Figure 3.
Power Screening rents and sells heavy machinery for aggregate processing, demolition, and construction from three locations. Request a quote with our online form or call us at (800) 231-5005 today to learn how we can help you. Aggregates as "inert granular material such as sand, gravel, or crushed stone.".
lightweight aggregate, the raw material (excluding pumice) is expanded to about twice the original volume of the raw material. The expanded material has properties similar to natural aggregate, but is less dense and therefore yields a lighter concrete product. The production of lightweight aggregate begins with mining or quarrying the raw material.
LECA is one of the most popular artificial lightweight aggregates that has been commercialized in the market used to replace natural aggregate. The production rate can be up to 200,000 m 3 per year, depending on local LECA requirements and capital available. LECA is a new revolutionary material, and its manufacturing rate compared to …
