(PDF) Research on crushing and recycling of waste concrete
Currently, one method of recycling waste concrete is to crush, clean, and grade waste concrete to obtain recycled aggregate particles. The particles with a size Previous studies focused on four quarries with different types of rock massifs in Brazil [21] guided the development of this research. These quarries were The influence of crushing processes and mineralogy of aggregates
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Concrete Crush an overview ScienceDirect Topics
For over-reinforced beams, concrete crushing is the primary contribution to the failure of the beams (Nanni and Tanigaki, 1992). Such a compression-controlled failure mode may be and crushing technology. At present, a relatively mature waste concrete crushing process has been formed and put into production [7]. 3.Crushing technology of waste concrete FOLQJRIZDVWH FRQFUHWH IOPscience
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Buildings Free Full-Text Effect of Crushing Method on the
Samples of five laboratory-made concretes have been crushed using the most common mechanical crushing methods (impact crusher and jaw crusher), and the The study proved the applicability of the concrete reuse method by crushing leftovers for the production of recycled aggregates up to 48 h. The crushing process for Evaluation of the use of crushed returned concrete as recycled
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Crushing treatment on recycled aggregates to improve
Introduction The technical, economic and environmental improvements of recycled aggregates (RA) from the treatment of construction and demolition waste This study proposes a new mix design method for C30 recycled concrete using recycled aggregate crushed from different strength source concrete (SC). The New Mix Design Method for Recycled Concrete Using Mixed
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Is crushed concrete carbonation significant enough to be
Concrete has a remarkable performance in terms of versatility, strength and durability. For that reason, mankind has relied on it to build and operate urban environments for centuries [].However, awareness on the CO 2 intensity that accompanies cement and concrete production has risen in the past decade [2–5].Still, the technical To properly define the concrete compressive behavior and reliably predict the capacity of RC members governed by concrete crushing, it is necessary to (1) clarify the principle of modifying the concrete compressive constitutive model with consideration of the strain localization and (2) develop a practical approach for determining the size ofA Practical Finite Element Modeling Strategy to Capture
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Estimating the flexural strength of corroded reinforced concrete
Introduction Background of the Study. Due to Ca(OH) 2 produced during the hydration of cement, concrete presents a highly alkaline environment to embedded steels [1].Within a day of concrete placement, the hydroxide ions react with ferrous ions at the surface of steel bars to form a thin film of passive iron-oxide that protects the The external concentrated load at which the concrete crushing failure occurs is called crushing load (P crushing). Assuming that fibres enhance the splitting bearing capacity The test set-up was adopted according to the previous experimental campaign carried out by Tiberti et al. [6]. In particular, a displacement controlled test wasSplitting and crushing failure in FRC elements ScienceDirect
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Closed-loop recycling of C&D waste: Mechanical properties of concrete
Through a series of concrete making and crushing, once-, twice-, three times-recycled concrete powder of less than 150 μm was collected and used as a partial replacement for cement in concrete matrices at replacement levels of 10%, 20% and 30%. These results are consistent with previous studies on repeatedly recycled RAC (Abreu et Abstract This study proposes a new mix design method for C30 recycled concrete using recycled aggregate crushed from different strength source concrete (SC). The dosages of cement, water, sand, and coarse recycled concrete aggregate (CRCA) are the same as the corresponding components in natural concrete, but the CRCA should be New Mix Design Method for Recycled Concrete Using Mixed
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Testing and finite element analysis of reinforced concrete
The tested footing (Fig. 2) was loaded at its column top by vertical axial load using the hydraulic jack (Figs. 4 b and 5).The load was increased until the punching of column through the footing occurred. The dimensions of the specimens for the proposed testing programme were 85 × 85 cm in layout and correspond to the earlier experiments prestressed concrete beams: tension controlled (rupture of prestressing CFRP) and compression controlled (con-crete crushing). Previous experimental studies consistently demonstrated that the deformation at ultimate load is less for beams pretensioned with prestressing CFRP than for beams prestressed with steel prestressing Flexural behavior of full-scale, carbon-fiber-reinforced
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Cracking feature and mechanical behavior of shield tunnel
In short, according to the loading path and loading level, there are several failure phenomena, including concrete crushing outside the joint, concrete cracking near the bolt hole, concrete cracking from the inner surface of the segment, and bolt yielding. Download : Download high-res image (557KB) Download : Download full-size image; Fig. Using SOLID65 solid elements, the compressive crushing of concrete is facilitated using plasticity algorithm while the concrete cracking in tension zone is accommodated by the nonlinear material model. Smeared reinforcement is used and introduced as a percentage of steel embedded in Based on the previous solution CRACK IDENTIFICATION IN REINFORCED CONCRETE
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Effect of Abrasive Concentration on Impact Performance of
For 20 MPa and 40 MPa, the crushing depth changes linearly with the abrasive concentration from 0% to 20%, while the growth rate from 20% to 30% becomes slower. For 60 MPa and 80 MPa, the abrasive water jet has little effect on increasing the crushing depth with abrasive concentration changing from 5% to 10%.Nonlinear finite element (FE) analysis of reinforced concrete (RC) structures is characterized by numerous modeling options and input parameters. To accurately model the nonlinear RC behavior involving concrete cracking in tension and crushing in compression, practitioners make different choices regarding the critical Materials Free Full-Text A Practical Finite Element
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Experimental study on crushing of concrete columns by high
High voltage pulse discharge (HVPD) crushing tests were carried out on 30 concrete columns with section sizes of 400 mm × 400 mm, 500 mm × 500 mm, 600 mm × 600 mm and 700 mm × 700 mm respectively. Based on the comparative analysis of the electrohydraulic effect and the copper wire explosion on the fracture test of a concrete The tensile rupture and concrete crushing failure modes are correctly predicted by the present technique for 92% of beams considered (98 beams) as indicated in Table 1. Download : Download full-size image. Fig. 3. Experimental versus predicted moment capacities of FRP reinforced concrete beams.Flexural performance of FRP reinforced concrete beams
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Determination of Gradation of Recycled Mixed Coarse
A loading crushing test of recycled mixed coarse aggregates in the same particle diameter range is carried out, and the crushed coarse aggregates are screened, manually sorted, and weighed to study the crushing characteristics of recycled mixed coarse aggregates. The results show that the effect of “reinforcing the strong and discarding the Using pulse power technology to break concrete structures can reduce environmental pollution, save energy, and increase safety and reliability. The whole process of concrete beam subjected to shock wave generated by pulse power discharge was simulated and analyzed. An experiment of breaking reinforced concrete beams by metal Study on Breaking Concrete Structures by Pulse Power
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Possibilities of improving crushed sand performance in fresh concrete
The paper presents an industrial case study where possibilities of removing the excess of fines from crushed sand are investigated in full-scale sand washing experiments. The results are in line with previously reported investigations on laboratory scale, and indicate that the used washing technique primarily reduced the amount of Previous research shows that, because of their tension-stiffening effect, reinforcing bars or prestressing strands used in structural members enhance the cracking distribution and tensile ductility of fiber-reinforced concrete. They reported significant concrete crushing and bar buckling in the RC column, but no visible damage was detectedA Review of Developments and Challenges for UHPC in
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Concrete crushing and sampling, a methodology and
@article{osti_21156397, title = {Concrete crushing and sampling, a methodology and technology for the unconditional release of concrete material from decommissioning}, author = {Gills, R and Lewandowski, P and Ooms, B and Reusen, N and Van Laer, W and Walthery, R}, abstractNote = {Belgoprocess started the industrial In order to objectively evaluate the obtained research results, the analyses of linear regression and correlation were carried out. In these analyses (Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8), aggregate crushing resistance was the independent variable.When analyzing the power of conformity of elastic and strength properties of Impact of mechanical resistance of aggregate on properties of concrete
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