0086-21-58386256
The research objective of this paper is to design recycled aggregate concrete. The RCA replaces natural gravel as the coarse aggregate, and the RCBA replaces natural sand as the fine aggregate. The orthogonal test design RAC is …
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 velocity, impact time, and concrete strength on the quality of the RCA are investigated.
Coarse and fine aggregates are generally sieved separately. That portion of an aggregate passing the 4.75 mm (No. 4) AGGREGATES FOR CONCRETE E1-3 sieve and predominantly retained on the 75 µm (No. 200) sieve is called "fine aggregate" or "sand," and larger aggregate is called "coarse aggregate."
The comparisons were made by replacing conventional coarse aggregates at 0%, 2.5%, 4.5%, 6.5%, 8.5% and 10% by weight of coconut shell. Mix design of 1:2:4 and water-cement ratio of 0.50 were used to produce concrete specimen of cubes size 150mm3 and cylinder sizes 100mm x 200mm. A total of 48 concrete specimens were
Structural-grade geopolymer concrete (GPC) containing metakaolin (MK) was assessed by partial inclusion of recycled coarse aggregate (RCA) to produce environmental-friendly composites. Polypropylene (PP) fiber was also used at different weight ratios. Mechanical and durability properties of GPCs were then evaluated.
According to the 'Standard for Quality and Inspection Methods of Sand and Stone for Ordinary Concrete (JGJ52-2006)', the coarse aggregates of 5–10 mm (Fig. 1 b) grain size and 10–20 mm (Fig. 1...
Coarse aggregate movement Compaction discreteness Aggregate crushing 1. Introduction The quality of compaction mainly determines the performance of …
To investigate the dynamic characteristic of coarse aggregates within epoxy asphalt mixture, this study conducted a virtual simulation of the Superpave gyratory compaction …
The equivalent diameter of steel fibers employed in the paper calculated by the Yu model is 6.78 mm. By considering the control threshold of coarse aggregate content and the effects of steel fibers on …
A three-dimensional compaction model of epoxy asphalt mixture was built and verified, considering the irregular polyhedral morphology and the elastic property of coarse aggregates, the mastic volume and the thermosetting and viscoelastic properties of …
To investigate the dynamic characteristic of coarse aggregates within epoxy asphalt mixture, this study conducted a virtual simulation of the Superpave gyratory compaction (SGC) test based on the discrete element method and artificial neural network. ... Results demonstrate that the compactness increment mainly depends on the movement and ...
The coarse aggregate has a major effect on concrete properties such as abrasion resistance, hardness, elastic modulus, and another characteristic like durability, strength, and cheaper. Other applications of coarse aggregate are to backfills, fills, drainage, and filtration work.
The coarse aggregate has a major effect on concrete properties such as abrasion resistance, hardness, elastic modulus, and another characteristic like …
Additionally, three types of fine aggregates (size range: 0.85–2.36 mm, 0.425–0.85 mm, 0.212–0.425 mm) and granite coarse aggregate with a size range of 5–10 mm are used. Besides, a high …
After secondary crushing using an impact crusher or an E-crusher aggregate crushing plant, the concrete was graded into three types of fine and coarse recycled aggregates with sizes of 10–30 mm, 5–10 …
The compaction process of coarse aggregate in asphalt mixtures corresponds to a mathematical interval of discontinuity in the asphalt mixture forming process. The compaction leads to a reset of the gradation, although this is …
The purpose of this paper is to explore the numerical simulation of damage process and results of a new environmentally friendly material, recycled coarse aggregate self-compacting concrete (RCASCC). Random aggregate model of mesoscopic viewpoint was used for the experimental simulation of RCASCC.
High-frequency vibration helps to improve the compactness of concrete, but also causes the settlement of coarse aggregates (CAs) and then affects the durability of …
The density of coarse Aggregate is the aggregate mass per unit volume of c oarse Aggregate. The density is expressed in kg / m3 or lb / ft3 and indicates the …
Coarse aggregate, sand, cement, slag powder, and fly ash shall be manually mixed for 1 min, and then the concrete mixer shall be used for dry mixing for 2 min. After ensuring that all materials are fully contacted, the mixing water shall be added to continue mixing for 2 min, and then the vibrating table shall be used for vibration and …
Fig. 1. Compaction front-to-back stage pairing ratio. The fragmentation of asphalt mixture coarse aggregates occurs during asphalt mixture compaction, which …
Contains 60 to 80 per cent of the aggregate in concrete. Which produces compressive and bulk in concrete. The aggregates are classified into two categories as follows: Fine aggregate Coarse aggregate Fine aggregates usually consist of sand or crushed stone. Which is less than 4.75 mm in size.
The compactness of the concrete matrix was the key factor influencing the durability of the SFRCAC. The durability performance of the SFRCAC increased as the volume fraction (Vf) increased from...
The coarse aggregate compactness calculation method based on form parameter that the invention discloses a kind of, including using multi-view stereo vision to carry out three …
When compaction effort exceeds the bearing capacity limit of the skeleton, the reduction of coarse aggregate particles, the decrease in the number of contact points and the fluctuation in aggregate inclination are observed. ... an increase in compactness can strengthen the rutting resistance of asphalt mixture, but this conclusion does not ...
Natural aggregates were phonolitic 19 mm and 12.5 mm gravels as the nominal maximum size (NMS) and crushed sand with a fineness modulus (FM) of 1.55. From the Pecem Thermoelectric Power Plant, fine coal bottom ash (FCBA) with an FM of 1.10 and coarse coal bottom ash (CCBA) with 19 mm as NMS were used. This CCBA …
Taking the quality of recycled coarse aggregate (SCRCA, PPRCA, and SPRCA) and the replacement ratio (25%, 50%, 75%, and ) as the influencing factors to prepare the green recycled concrete, the workability and shrinkage property of the prepared concrete were analyzed. ... It can be seen that the structural compactness of the green …
Large-sized modern buildings with complex geometry and dense reinforcement arrangement usually require fresh concrete to have enough flowability to be poured easily and sufficient stability to ensure the quality of reinforced concrete structures.
Coarse aggregate is a term used in construction to describe a type of material that is commonly used in the production of concrete. It is typically made up of various materials such as gravel, crushed stone, and recycled concrete. The size of the coarse aggregate can vary, but it is typically between 3/8 inch and 1.5 inches in diameter.