Fracture energy of coarse recycled aggregate concrete using the wedge splitting test method: influence of water-reducing admixtures

2016 ◽  
Vol 50 (2) ◽  
Author(s):  
J. García-González ◽  
T. Barroqueiro ◽  
L. Evangelista ◽  
J. de Brito ◽  
N. De Belie ◽  
...  
Keyword(s):  
Fracture Energy ◽  
Recycled Aggregate Concrete ◽  
Test Method ◽  
Recycled Aggregate ◽  
Aggregate Concrete ◽  
Wedge Splitting Test ◽  
Splitting Test ◽  
Influence Of Water ◽  
Wedge Splitting

Chloride Diffusion Property of Recycled Aggregate Concrete Treated with Water Repellent Agents-Silane

2010 ◽  
Vol 168-170 ◽  
pp. 755-761
Author(s):  
Ya Guang Zhu ◽  
Jian Guo Dai ◽  
Qiu Yi Li
Keyword(s):  
Treatment Method ◽  
Recycled Aggregate Concrete ◽  
Test Method ◽  
Recycled Aggregate ◽  
Chloride Diffusion ◽  
Water Repellent ◽  
Diffusion Property ◽  
Aggregate Concrete ◽  
Astm C1202 ◽  
Better Than

Silane-base water repellent agents can significantly suppress the capillary water absorption of concrete and consequently improve the durability of the concrete and protects the internal steel reinforcement. This paper presents test result on chloride diffusion property of natural and recycled aggregate concrete externally and internally treated with silane-based water repellent agents based on the ASTM C1202 test method. The effects of concrete cracks on the chloride diffusion property were also investigated. After the tests, the impregnation depth of silane into the natural and recycled aggregate concrete, the total charges passing the testing samples and penetration depth of chloride during the testing period were determined. It was found that, for both cracked and uncracked concrete, externally treated natural and recycled aggregate concrete performed better than internally treated ones. The water repellent treatment method is more effective for recycled aggregate concrete than natural aggregate concrete because a deeper impregnation depth can be achieved in the former case.

scholarly journals Mechanical Properties of Recycled Aggregate Concrete at Low and High Water/Binder Ratios

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Gai-Fei Peng ◽  
Yan-Zhu Huang ◽  
Hai-Sheng Wang ◽  
Jiu-Feng Zhang ◽  
Qi-Bing Liu
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Fracture Energy ◽  
Main Type ◽  
High Water ◽  
Recycled Concrete ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Heating Process ◽  
Aggregate Concrete

This paper presents an experimental research on mechanical properties of recycled aggregate concrete (RAC) at low and high water/binder (W/B) ratios. Concrete at two W/B ratios (0.255 and 0.586) was broken into recycled concrete aggregates (RCA). A type of thermal treatment was employed to remove mortar attached to RCA. The RAC at a certain (low or high) W/B ratio was prepared with RCA made from demolished concrete of the same W/B ratio. Tests were conducted on aggregate to measure water absorption and crushing values and on both RAC and natural aggregate concrete (NAC) to measure compressive strength, tensile splitting strength, and fracture energy. The mechanical properties of RAC were lower than those of NAC at an identical mix proportion. Moreover, the heating process caused a decrease in compressive strength and fracture energy in the case of low W/B ratio but caused an increase in those properties in the case of high W/B ratio. The main type of flaw in RCA from concrete at a low W/B ratio should be microcracks in gravel, and the main type of flaw in RCA from concrete at a high W/B ratio should be attached mortar.

Wedge Splitting Test and Fracture Energy on Particulate Reinforced Composites

2016 ◽  
Vol 40 (3) ◽  
pp. 253-258 ◽  
Author(s):  
Seong Hyeon Na ◽  
Jae Hoon Kim ◽  
Hoon Seok Choi ◽  
Jae Beom Park ◽  
Shin Hoe Kim ◽  
...  
Keyword(s):  
Fracture Energy ◽  
Reinforced Composites ◽  
Wedge Splitting Test ◽  
Splitting Test ◽  
Particulate Reinforced Composites ◽  
Particulate Reinforced ◽  
Wedge Splitting

Relationship between Defects of Recycled Aggregate and Mechanical Properties of Recycled Aggregate Concrete

2014 ◽  
Vol 629-630 ◽  
pp. 314-320
Author(s):  
Gai Fei Peng ◽  
Jiu Feng Zhang
Keyword(s):  
Mechanical Properties ◽  
Water Absorption ◽  
Fracture Energy ◽  
High Water ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Cracking Resistance ◽  
Aggregate Concrete ◽  
Binder Ratio ◽  
Water Binder Ratio

This paper presents an experimental research on the influence of defects of recycled coarse aggregate on mechanical properties of recycled aggregate concrete (RAC). Concretes at two water/binder ratios (0.255 and 0.586) were broken into recycled aggregate (RA). A type of thermal treatment, i.e. heating to target temperature 620 °C, which was maintained for 3 hr, was employed to remove mortar from gravel in RA. Tests were conducted on RA and natural aggregate to measure their water absorption and crushing values, and on RAC and natural aggregate concrete (NAC) to measure compressive strength, tensile splitting strength, and fracture energy. The experimental results revealed that both gravel damage and mortar attached can significantly influence the water absorption and crushing value of RA, as well as strength and fracture energy of RAC. The mechanical properties RAC were obviously lower than those of NAC at an identical mix proportion. Moreover the removal of mortar caused additional change in mechanical properties of RA, which might be a decrease in mechanical properties in the case of low water/binder ratio, but might be an increase in mechanical properties in the case of high water/binder ratio. As to RAC at a low water/binder ratio, gravel damage was a main factor governing the decrease in fracture energy, which means a decrease in cracking resistance of hardened RAC, whereas the mortar attached had only a slight influence on fracture energy. However, as to RAC at a high water/binder ratio, mortar attached could significantly cause a greater decrease in cracking resistance of RAC than that caused by gravel damage.

scholarly journals Wedge-Splitting Test on Carbon-Containing Refractories at High Temperatures

2019 ◽  
Vol 9 (16) ◽  
pp. 3249 ◽  
Author(s):  
Stückelschweiger ◽  
Gruber ◽  
Jin ◽  
Harmuth
Keyword(s):  
Tensile Strength ◽  
Fracture Energy ◽  
Laser Speckle ◽  
Displacement Measurement ◽  
Ambient Atmosphere ◽  
Specific Fracture Energy ◽  
Wedge Splitting Test ◽  
Splitting Test ◽  
Specific Fracture ◽  
Wedge Splitting

The mode I fracture behavior of ordinary refractory materials is usually tested with the wedge-splitting test. At elevated temperatures, the optical displacement measurement is difficult because of the convection in the furnace and possible reactions of refractory components with the ambient atmosphere. The present paper introduces a newly developed testing device, which is able to perform such experiments up to 1500 °C. For the testing of carbon-containing refractories a gas purging, for example, with argon, is possible. Laser speckle extensometers are applied for the displacement measurement. A carbon-containing magnesia refractory (MgO–C) was selected for a case study. Based on the results obtained from tests, fracture mechanical parameters such as the specific fracture energy and the nominal notch tensile strength were calculated. An inverse simulation procedure applying the finite element method yields tensile strength, the total specific fracture energy, and the strain-softening behavior. Additionally, the creep behavior was also considered for the evaluation.

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