No. 1688, Gaoke East Road, Pudong new district, Shanghai, China.
No. 1688, Gaoke East Road, Pudong new district, Shanghai, China.
Resource utilization of construction and demolition (C&D) waste has great potential to significantly reduce the consumption of natural resources and improve the environment. Meanwhile, establishing a sound policy system and reducing production are the key ways to solve the problem of C&D waste. Numerous studies on C&D waste, recycled concrete …
Portland cement is the commonly used type of cement for production of concrete. Concrete technology deals with study of properties of concrete and its practical applications. ... 1 is the ratio of sand and 2 is the ratio of coarse aggregate based on volume or weight of materials.
Part II. Structural behaviour of recycled aggregate concrete and engineering applications. Resour Conserv Recycl 53:107–112. Article Google Scholar Liu S, Shen P, Xuan D, Li L, Sojobi A, Zhan B, Poon CS (2021) A comparison of liquid-solid and gas-solid accelerated carbonation for enhancement of recycled concrete aggregate.
Since the construction industry is one of the major sectors responsible for the overexploitation of natural resources and the production of greenhouse gases, there is an urgent need to adopt a sustainable and environmental friendly approach to mitigate climate degradation. Research has explored the potential of recycled aggregate (RA) as a viable alternative to …
Using aggregate materials for concrete reduces production costs and increases the resistance of concrete mixes. Crushed aggregates make up for around 60% to 75% of the volume of concrete. These crushed aggregates significantly affect the properties of freshly-mixed and hardened concrete – making it more compact, decreasing its permeability ...
In the production of concrete, aggregates are one of the most essential ingredients in its formation. These small granular particles can be made up of crushed stone, gravel, or sand, and make up 60-75% of the final …
As the demand for high-performance concrete grows in the construction industry, aggregate processing technology has advanced significantly. Modern aggregate processing …
16% of U.S. ready-mix concrete production volume is in Texas. The annual revenue of the Texas aggregate, cement and concrete industries is more than $10 billion, providing jobs and much-needed tax revenue to the state. More than 15 local, state and federal agencies regulate the aggregate, cement and concrete industries in Texas.
Blengini et al. propose a management approach, i.e. sustainable aggregates resource management project (SARMa), which proposed guidelines for the sustainable management of aggregates.As per diversified studies conducted in recycling CDW, recycled concrete aggregate (RCA) can replace a significant portion of NA in the production of concrete …
This post explains all the 14 engineering properties of aggregates used for concrete such asabrasion resistance, impact resistance, bulking, size etc.
The accumulation of electronic waste (E-waste) has become a significant global environmental issue, driven by the characteristics of the modern era and the ever-increasing use of electronic devices. Thus, a sustainable approach is necessary to overcome this issue. In this paper, an overview of utilizing E-waste as a sustainable aggregate in concrete production was …
concrete and also the durability, strength, thermal properties, and density of hardened concrete. This Bulletin describes types of aggregates normally used in concrete, aggregate properties …
Aggarwal and Siddique (2014) observed that compressive strength of the concrete reduced with addition of WFS and CBA at the equal replacement of fine aggregate in concrete. 40% of steel slag was found to higher strength as compared to control concrete beyond which the strength reduces (Qasrawi et al., 2009; Subathra Devi and Gnanavel, 2014).
Question: How to Control Mass Concrete Temperature during Construction. Question: What is the difference between corrected and uncorrected weight in a concrete mix design? View all …
Construction and demolition activities consume large amounts of natural resources, generating 4.5 bi tons of solid waste/year, called construction and demolition waste (C&DW) and other wastes, such as ceramic, …
In contrast, concrete production is far more decentralised (Fig. 5), with production typically at the local level of batching plants (or pre-fabrication factories), with on-site production widespread for the informal sector in developing countries.This difference in the supply chain distribution makes changes easier to enact for a given site, but less easy to cascade horizontally along the ...
Besides the CO 2 emission released by cement production, large amounts of sand and gravel are extracted to serve as aggregates—it is estimated that the natural ... Ji T., Liu H., Su S. Modifying Recycled Aggregate Concrete by Aggregate Surface Treatment Using Sulphoaluminate Cement and Basalt Powder. Constr. Build. Mater. 2018;192:526–537 ...
Color: The color of stucco is determined by the cement and aggregate color and can be modified by adding mineral oxide pigments. White portland cement allows for a wide range of colors, including bright white. ... This more than offsets the CO2 associated with the production of the cement used to make the concrete.
Impact category indicators per kg of concrete constituent materials were taken from European manufacturers' EPDs for cement, plasticizer, and reinforcement 84-87 or calculated using the Ecoinvent V2.0 database for …
Aggregates are raw materials that are produced from natural sources and extracted from pits and quarries, including gravel, crushed stone, and sand. When used with a binding …
The environmental influence of cement content, aggregate production, transportation, and waste landfilling is analysed by undertaking a life cycle assessment and considering a life cycle inventory largely specific for the region. To obtain a detailed insight into the optimum life cycle parameters, a sensitivity study is carried out in which ...
An aggregate's particle sizes influence the concrete's structure and quality. One role of coarse aggregate in concrete is to reduce production costs by reducing the amount of cement you need. Cement tends to be more expensive than aggregates and you won't need as much to create the final product.
The shape and texture of aggregate affects the properties of fresh concrete more than hardened concrete. Concrete is more workable when smooth and rounded aggregate is used instead of …
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
Cement production, however, also generates most of concrete's emissions: in fact, a 2016 study found that cement accounts for around 7% of all greenhouse gas emissions worldwide. 2. Cement begins as crushed minerals that are heated in a kiln to make what is called "clinker." Clinker is ground into a powder, mixed with a few additives, and ...
The aggregates used in the production of concrete are inert granular materials such as gravel, crushed stone, sand, slag, recycled concrete, and geosynthetic aggregates. The aggregates …
Concrete is a composite material made up of cement, aggregates (such as gravel or sand), water, and a suitable amount of admixtures (like fly ash or slag powder). ... For instance, Europe leads in environmentally friendly aggregate production, while Asian countries excel in large-scale production and application of aggregates.
Uses and Applications of Aggregates in Concrete . Aggregates form the foundational support for building construction, facilitating the weight-bearing capacity of structures. They are essential in formulating concrete mixes for floors and walls, influencing durability and …
Recycled aggregates (RA) from construction and demolition waste (CDW) instead of natural aggregates (NA) were analysed in the manufacture of new eco-friendly concrete. Fine (FRA) and coarse (CRA) recycled aggregates were used in different percentages as substitutes of natural sand and gravel, respectively. The results revealed that the use of RA in percentages …
Only the chipping of concrete according to type 1 and type 2 (as defined in the above standard) can be used for concrete production. Type 1 RA can be associated to a RCA: it contains at least 90 % of concrete and natural aggregates, not more than 10 % of clinker, non-pored bricks, sand-lime bricks, less than 2 % of other mineral materials and less than 1 % of …
