- منطقة بودونغ الجديدة ، شنغهاي ، الصين .
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The application of recycled concrete requires the reliable information on its flexural performance especially after cracking. In this study, the three-point bending tests were carried out on 40 notched beam specimens to investigate the flexural performance and damage process of steel fiber reinforced recycled coarse aggregate concrete …
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In this paper, a novel extrusion-based 3D printed material was obtained by preparing 3D printed recycled coarse aggregate concrete (3DPRAC) using recycled coarse aggregate (RCA), and the compressive and flexural properties were investigated at different RCA replacement ratios, ages, and construction forms.
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The size of the particles determines whether it is a coarse aggregate (e.g. gravel) or a fine aggregate (e.g. sand). The resulting concrete can be used in its natural state or crushed, according to its use and application. ... as well as the material properties of the aggregates needed at various stages of the construction process. In addition ...
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The future studies can incorporate cost calculations for the carbonation process of coarse aggregate to provide a more comprehensive evaluation of all types of coarse aggregates. Additionally, as the investigation on the carbonation of RCA advances, it will be feasible to a broader range of properties in prediction and optimization analysis. ...
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To accurately describe the 3D surface morphology of a coarse aggregate, in this paper, the parameter θ* max/(C + 1) was adopted to characterize the macro-waviness of the coarse aggregate surface and the arithmetical mean deviation R a was used to describe the micro-roughness on each macro-waviness, respectively. 3.
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The present study focuses on identifying suitable and sustainable waste materials in concrete by replacing for coarse aggregates. Investigations have been conducted to determine how well the inappropriate wastes, palm kernel shells, periwinkle shells, and coconut shells perform as substitute for coarse materials in concrete.
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Concrete with coarse aggregate in the 3D concrete (3DCP) has broad prospects for high strength, low cost and shrinkage. In this study, an extrusion-based 3D printer was designed and utilized to print concrete with the largest aggregate size of 20 mm. Printable concrete with coarse aggregate was designed by different volume ratios …
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The morphology of coarse aggregates plays a significant role in concrete performances. This study conducted a quantitative analysis on the morphology of coarse aggregates using visual learning technology, aiming to explore their effects on fluidity, rheology and mechanical properties of fresh concrete.
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The shape of coarse aggregate is an important factor determining the performance of concrete, and it also affects the whole mixing process. This article selected four typical coarse aggregates and simulated the motion behavior of the coarse aggregate and mortar in a dual horizontal axis mixer using discrete element software, EDEM. The …
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The transformation mechanism of asphalt mixture aggregate network was captured and analyzed during the MIC process, the new index of the coarse aggregate particles contact unbalance force was proposed, which was used to reveal the mechanism of coarse aggregate movement and evaluated the stability of asphalt mixture. …
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T27_T11_short_12 Aggregate 12-1 Pub. October 2012 SIEVE ANALYSIS OF FINE AND COARSE AGGREGATES FOP FOR AASHTO T 27 . MATERIALS FINER THAN 75 µm (No. 200) SIEVE IN MINERAL AGGREGATE BY WASHING FOP FOR AASHTO T 11 . Scope Sieve analysis determines the gradation or distribution of aggregate particle …
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Concrete made by post-filling coarse aggregate process could reduce the cement content greatly compared with traditional concrete placement method. Thus, it not only lowers the production cost of concrete through lower usage of cement but also reduces the CO 2 emissions to the environment. In this paper, the compressive and tensile …
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What Is Coarse Aggregate? 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.
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Figure 1 shows the designed construction process for post-filling coarse aggregate concrete in buildings. In this study, the shear behavior of post-filling coarse aggregate concrete beams with different concrete strength grades (C30, C40 and C50) and different post-filling coarse aggregate ratios (0%, 10%, 15% and 20%) was …
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In case using both fine and coarse aggregate replacements simultaneously the compressive strength values increased in all cases. However, the optimum mix can be obtained by replacement of fine aggregate by 20% and the replacement of coarse aggregate by 10%.
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5.2 Relative density is used to calculate the volume occupied by the aggregate in various mixtures containing aggregate, including hydraulic cement concrete, bituminous concrete, and other mixtures that are proportioned or analyzed on an absolute volume basis. Relative density (specific gravity) is also used in the computation of voids …
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For coarse aggregate, the large tray shaker is most commonly used (Figure 1). This device provides a clamping mechanism which holds the sieve in place during agitation. Shakers of this make need to be run 5 minutes for size 9 or larger and 10 …
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The shape of coarse aggregate is an important factor determining the performance of concrete, and it also affects the whole mixing process. This article selected four typical coarse aggregates and simulated the motion behavior of the coarse aggregate and mortar in a dual horizontal axis mixer using …
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AbstractHigh-quality coarse aggregates are routinely used for the surface, base, and subbase layers in paved roads or the surface course in unpaved low-volume roads. Unfortunately, high-quality aggregates meeting stringent material specifications are ...
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