Mechanical Behaviors of Structural Concrete Using Recycled Aggregates from Repeatedly Recycling Waste Concrete

2012 ◽  
Vol 450-451 ◽  
pp. 1379-1382
Author(s):  
Jin Cai Feng ◽  
Ping Hua Zhu ◽  
Qun Xia
Keyword(s):  
Recycled Aggregates ◽  
Mechanical Behaviors ◽  
Structural Concrete ◽  
Waste Concrete

Mechanical Behaviors of Structural Concrete Using Recycled Aggregates from Repeatedly Recycling Waste Concrete

2012 ◽  
Vol 450-451 ◽  
pp. 1379-1382 ◽  
Author(s):  
Jin Cai Feng ◽  
Ping Hua Zhu ◽  
Qun Xia
Keyword(s):  
Compressive Strength ◽  
Recycled Concrete ◽  
Recycled Aggregates ◽  
Fine Aggregate ◽  
Mechanical Behaviors ◽  
Structural Concrete ◽  
Waste Concrete ◽  
Fine Aggregates ◽  
Tensile Splitting Strength

This paper reports an expermiental study on mechanical behaviors of structural concrete using recycled aggregates from repeatedly recycling waste concrete. Five series of natural aggregate concretes with compressive strengths of 25MPa, 30MPa, 40MPa, 50MPa and 60MPa were used as recycled coarse and fine aggregates to produce recycled concrete with an objective compressive strength of 30MPa after they were cured for 28d. These recycled concretes were used as aggregates to produce concrete with the same objective compressive strength of 30MPa. The cycles were carried on until the indices evaluating the quality of recycled coarse or fine aggregate exceeded the tolerance. The mechanical behaviors of these concrete were tested. The results indicates that that with the increase of the cyclic number, the mechanical properties of recycled concrete, including compressive strength, tensile splitting strength, modulus of elasticity, gradually stabilize after obviously decreaing in the first instance.

Mechanical Behavior of Structural Concrete Made with Recycled Aggregates from Tunnel Excavation

2010 ◽  
Vol 452-453 ◽  
pp. 121-124
Author(s):  
Paola Antonaci ◽  
Davide Masera
Keyword(s):  
Experimental Study ◽  
Mechanical Behavior ◽  
Working Conditions ◽  
Recycled Aggregates ◽  
Structural Concrete ◽  
Tunnel Excavation ◽  
Experimental Procedure ◽  
Laboratory Protocol

The results of an experimental study concerning the behavior of concretes made with recycled aggregates under repeated mechanical and thermal actions are presented. A comparison with the performances achieved by similar concretes made with traditional aggregates in the same working conditions eventually made it possible to estimate the actual quality and durability of the recycled concretes examined and identify possible limitations in their use. The laboratory protocol here adopted is suggested as a practical experimental procedure to test hardened concretes and pre-qualify their performances with respect to compressive actions and thermal solicitations.

On Properties of Recycled Fine Aggregate for Structural Concrete from Repeatedly Recycling Concrete Waste

2014 ◽  
Vol 665 ◽  
pp. 163-166
Author(s):  
Ping Hua Zhu ◽  
Fei Fei Xie ◽  
Qun Xia
Keyword(s):  
Structural Properties ◽  
Experimental Research ◽  
Performance Degradation ◽  
Recycled Aggregate ◽  
Fine Aggregate ◽  
Preparation Process ◽  
Structural Concrete ◽  
Recycled Fine Aggregate ◽  
Waste Concrete

In order to explore the possibility of using repeatedly recycling waste concrete as aggregate to produce structural concrete, experimental research was carried out on the structural properties of three kinds of recycled fine aggregate (RFA) with two-regeneration cycles, two single and one mixed. The results showed that the quality of all RFAs meet the needs of Grade Ⅲ in GB/T25177-2010 and Level L in JISA 5023-2000. The degree of performance degradation is observed to enhance with increasing recycling cycle when taking the same preparation process of recycled aggregate.

scholarly journals Properties of Non-Structural Concrete Made with Mixed Recycled Aggregates and Low Cement Content

Materials ◽  
2016 ◽  
Vol 9 (2) ◽  
pp. 74 ◽  
Author(s):  
Antonio López-Uceda ◽  
Jesús Ayuso ◽  
Martin López ◽  
José Jimenez ◽  
Francisco Agrela ◽  
...  
Keyword(s):  
Cement Content ◽  
Recycled Aggregates ◽  
Structural Concrete ◽  
Mixed Recycled Aggregates

Alternative processing procedures for recycled aggregates in structural concrete

2014 ◽  
Vol 69 ◽  
pp. 124-132 ◽  
Author(s):  
Marco Pepe ◽  
Romildo D. Toledo Filho ◽  
Eduardus A.B. Koenders ◽  
Enzo Martinelli
Keyword(s):  
Recycled Aggregates ◽  
Structural Concrete ◽  
Alternative Processing

On Properties of Recycled Coarse Aggregate from Repeatedly Recycling Waste Concrete

2011 ◽  
Vol 368-373 ◽  
pp. 2185-2188
Author(s):  
Ping Hua Zhu ◽  
Xin Jie Wang ◽  
Jin Cai Feng
Keyword(s):  
Compressive Strength ◽  
Coarse Aggregate ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Recycled Aggregates ◽  
Fine Aggregate ◽  
Recycled Coarse Aggregate ◽  
Coarse Aggregates ◽  
Recycled Fine Aggregate ◽  
Waste Concrete

The properties of recycled coarsee aggregates from repeatedly recycling waste concrete were determined. In this study, five series of concrete mixtures using coarse and fine natural aggregates were prepared, which have the same objective slump value from 35mm to 50mm and different compressive strengths ranging from 25MPa to 60 MPa. These five concretes were crushed, sieved, washed with water, hot treatmented at 300°C before they were used as recycled aggregates. After that, recycled aggregate concrete (RAC) was produced with an objectively compressive strength of 30MPa, in which the recycled coarse aggregate was used as 30%, 70% and 90% replacements of natural coarse aggregate and recycled fine aggregate as 10%, 20%, and 30% replacements of natural fine aggregate. After that, these recycled concretes were used as second recycled aggregates to produce RAC with the same objectively compressive strength of 30MPa. The physical properties of coarse aggregates including apparent density, water absorption, attached mortar content and crushing value were tested and their mineral characteristics were analyzed. The results showed that the quality of recycled coarse aggregates from twicely recycling waste concrete reached the requirements from structural concrete.

Effects of Recycled Aggregates on Water-Cement Ratio for Concrete

2013 ◽  
Vol 423-426 ◽  
pp. 1010-1013 ◽  
Author(s):  
Wee Kang Choong ◽  
Lau Teck Leong ◽  
Choon Seng Sin ◽  
Abdullahi Ali Mohamed
Keyword(s):  
Cement Mortar ◽  
Recycled Aggregate ◽  
Recycled Aggregates ◽  
Structural Concrete ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Different Origins ◽  
Concrete Elements

Recycled aggregate differs from primary aggregate in that it constitutes of two types of materials: the primary aggregate and the attaching cement mortar. This study was conducted in order to investigate the effects on water-cement ratio for concrete cast with recycled aggregates derived from different origins (hollow blocks & structural concrete elements) and different mixed proportions of recycled aggregate contents. The outcomes of test indicate that higher water cement ratios are required for concrete cast with recycled aggregates as compare to those cast with primary aggregates. Also there appear no obvious relationships or consistencies that can be drawn among types of recycled aggregate.

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