Laboratory Investigation on the Cracking Performance of Paving Polyurethane Mixture Using Semi-Circular Bending Test

2022 ◽  
Author(s):  
Guihong Guo ◽  
Hongren Gong ◽  
Lin Cong ◽  
Fan Yang
Keyword(s):  
Laboratory Investigation ◽  
Bending Test ◽  
Cracking Performance

Experimente Research of Filler-Bitumen Ratio Impact on Asphalt Mixture Performance

2013 ◽  
Vol 361-363 ◽  
pp. 1851-1856 ◽  
Author(s):  
Lin Cao
Keyword(s):  
Low Temperature ◽  
Bending Strength ◽  
Asphalt Mixture ◽  
Bending Test ◽  
Bending Strain ◽  
Cracking Performance ◽  
Beam Bending ◽  
Bending Failure ◽  
The Impact ◽  
Asphalt Mortar

AH-130 base asphalt graded according to the upper limit of AC-16 close gradation is selected in this paper to identify the impact of asphalt mortar of different filler-bitumen ratios on asphalt mixture’s road performance through small beam bending test at low temperature. And then bending failure energy, in substitute of bending strength, bending strain, is used to evaluate the anti-cracking performance of asphalt mixture at low temperature.

scholarly journals Research on Low Temperature Performance of Emulsified Asphalt Cold Recycled Mixture and Improvement Measures Based on Fracture Energy

Materials ◽  
2020 ◽  
Vol 13 (14) ◽  
pp. 3176
Author(s):  
Jialin Zhang ◽  
Mulian Zheng ◽  
Jianzhong Pei ◽  
Jiupeng Zhang ◽  
Rui Li
Keyword(s):  
Low Temperature ◽  
Crack Resistance ◽  
Fracture Energy ◽  
Influencing Factors ◽  
Engineering Application ◽  
Bending Test ◽  
Energy Index ◽  
Cracking Performance ◽  
Emulsified Asphalt ◽  
Temperature Crack

At present, there are no specific indicators and requirements for the low-temperature crack resistance of emulsified asphalt cold recycled mixture (CRME) in the Chinese road mixture specifications. In order to expand the application of this technology in the asphalt surface layer in cold areas, this paper studied the influence of 10 influencing factors on the low-temperature anti-cracking performance of CRME through the semicircular bending test (SCB) with fracture energy as the evaluation index. The research results show that the fracture energy index of the SCB test can be used to evaluate the low temperature crack resistance of CRME. After 10 kinds of influencing factors were analyzed, it was found that the biggest factor affecting the low-temperature cracking resistance of the mixture was the recycling agent, which had an effect on the fracture energy index of over 60%. Followed by cement, fiber and compaction work, the degree of influence exceeded 30%. Finally, combined with engineering application experience, some specific measures to improve the low-temperature anti-cracking performance of CRME were proposed.

scholarly journals Comprehensive Study about Effect of Basalt Fiber, Gradation, Nominal Maximum Aggregate Size and Asphalt on the Anti-Cracking Ability of Asphalt Mixtures

2021 ◽  
Vol 11 (5) ◽  
pp. 2289
Author(s):  
Keke Lou ◽  
Xing Wu ◽  
Peng Xiao ◽  
Aihong Kang ◽  
Zhengguang Wu ◽  
...  
Keyword(s):  
Crack Resistance ◽  
Asphalt Mixture ◽  
Basalt Fiber ◽  
Aggregate Size ◽  
Asphalt Mixtures ◽  
Bending Test ◽  
Maximum Aggregate Size ◽  
Test Results ◽  
Cracking Performance ◽  
Test Ideal

There are many parameters that could affect the properties of asphalt mixtures, such as the fiber additive, gradation type, nominal maximum aggregate size (NMAS), and asphalt. To evaluate the influence of these factors on the crack resistance of asphalt mixture, 10 different types of asphalt mixtures were prepared. The indirect tensile asphalt cracking test (IDEAL-CT) and semi-circle bending test (SCB) were adopted to test the anti-cracking ability of the test samples. The parameters of these two test results were also used to conduct the correlation analysis to find the correlation between different parameters, and scanning electron microscope (SEM) test was also used to analyze the micro cracks of asphalt mixture. The results showed that basalt fiber could further enhance the anti-cracking ability of asphalt mixture. Stone matrix asphalt (SMA) showed better anti-cracking performance than Superpave (SUP) asphalt mixtures. The increase in the nominal maximum aggregate size could decrease the anti-cracking ability of asphalt mixtures. Styrene-Butadiene-Styrene (SBS) modified asphalt could better reinforce the anti-cracking ability than pure asphalt. The CTindex of IDEAL-CT test and Flexibility index (FI) value of SCB test results showed better correlation. This paper has certain significance in guiding the design of asphalt mixtures having good crack resistance.

scholarly journals Laboratory Study on the Performance of Asphalt Mixes Modified with a Novel Composite of Diatomite Powder and Lignin Fiber

2020 ◽  
Vol 10 (16) ◽  
pp. 5517 ◽  
Author(s):  
Moustafa Abdelsalam ◽  
Yanchao Yue ◽  
Ahmed Khater ◽  
Dong Luo ◽  
Josephine Musanyufu ◽  
...  
Keyword(s):  
Asphalt Pavement ◽  
Fiber Composite ◽  
Immersion Test ◽  
The Other ◽  
Bending Test ◽  
Asphalt Mixes ◽  
Modified Asphalt ◽  
Splitting Test ◽  
Cracking Performance ◽  
Asphalt Mix

The performance and the fundamental weaknesses of asphalt mix under environmental temperature and water effects have made researchers try to modify the asphalt mix properties by using the proper additives. For this reason, this paper aims to improve the anti-cracking performance and water stability of asphalt pavement by adding a novel composite of diatomite and lignin fiber in asphalt mixes. Four types of asphalt mixes, including control asphalt mix (CAM), diatomite modified asphalt mix (DMAM), lignin fiber modified asphalt mix (LFMAM), and diatomite-lignin fiber composite modified asphalt mix (DLFMAM) were prepared in the laboratory. Low-temperature bending test, Marshall Immersion test, and freeze-thaw splitting test were employed to evaluate the performance of the asphalt mixes. Results reveal that the use of the lignin fiber in reinforced asphalt mixes combined with diatomite led to an enhancement in the asphalt pavement performance more than the other three types of mixes. Diatomite has an important influence on the water damage resistance of asphalt mix more than lignin fiber. On the other hand, diatomite has a small effect on the anti-cracking performance; meanwhile, lignin fiber showed a significant improvement in the cracking resistance of asphalt mixes. DLFMAM has the best traveling performances among all asphalt mixes. Thus, this work provides a good reference for the design of composite asphalt mixes.

Study on Low Temperature Performance Evaluation Index of Asphalt Mixture Based on Bending Test at Low Temperature

2012 ◽  
Vol 193-194 ◽  
pp. 427-430
Author(s):  
Si Si Lv
Keyword(s):  
Low Temperature ◽  
Unit Volume ◽  
Asphalt Mixture ◽  
Bending Test ◽  
Evaluation Index ◽  
Temperature Performance ◽  
Failure Energy ◽  
Cracking Performance ◽  
Performance Evaluation Index ◽  
Low Temperature Performance

In order to characterize how the temperature influence Low Temperature anti-cracking performance and the ability of asphalt mixture resist low temperature, on the basis of bending test at low temperature, this paper from the angle of energy, introduce the concept of failure energy per unit volume as the evaluation index for the low temperature performance of asphalt mixture. Meanwhile, this paper used this evaluation index to perform bending test at low temperature for two kinds of different type of asphalt mixture which under three temperature as follows:0°C，-10°C，-20°C, And separately calculated failure energy per unit volume, then analyzes the characteristics and regularity of the index.

Preliminary Investigation on the Flexural Behaviour of Steel Fibre Reinforced Self-Compacting Concrete Ribbed Slab

2018 ◽  
Vol 15 (1) ◽  
pp. 31
Author(s):  
Nur Aiman Suparlan ◽  
Muhammad Azrul Ku Ayob ◽  
Hazrina Ahmad ◽  
Siti Hawa Hamzah ◽  
Mohd Hisbany Mohd Hashim
Keyword(s):  
Ultimate Load ◽  
Steel Fibre ◽  
Preliminary Investigation ◽  
Bending Test ◽  
Flexural Behaviour ◽  
Self Compacting Concrete ◽  
Two Samples ◽  
Simple Support ◽  
Set Up ◽  
Ultimate Load Carrying Capacity

A ribbed slab structure has the advantage in the reduction of concrete volume in between the ribs resulting in a lower structural self-weight. In order to overcome the drawbacks in the construction process, the application of steel fibre self-compacting concrete (SCFRC) is seen as an alternative material to be used in the slab. This preliminary investigation was carried out to investigate the flexural behaviour of steel fibre self-compacting concrete (SCFRC) as the main material in ribbed slab omitting the conventional reinforcements. Two samples of ribbed slab were prepared for this preliminary study; 2-ribbed and 3-ribbed in 1 m width to identify the effect of the geometry to the slab’s flexural behaviour. The dimension of both samples is 2.5 m x 1 m with 150 mm thickness. The compressive strength of the mix is 48.6 MPa based on the cubes tested at 28 days. Load was applied to failure by using the four point bending test set-up with simple support condition. The result of the experiment recorded ultimate load carrying capacity at 30.68 kN for the 2-ribbed slab and 25.52 kN for 3-ribbed slab. From the results, the ultimate load of the 2-ribbed sample exceeds 3-ribbed by approximately 20%. This proved that even with lower concrete volume, the sample can still withstand an almost similar ultimate load. Cracks was also observed and recorded with the maximum crack width of 2 mm. It can be concluded that the steel fibres do have the potential to withstand flexural loadings. Steel fibre reduces macro-crack forming into micro-cracks and improves concrete ductility, as well as improvement in deflection. This shows that steel fibre reinforced self-compacting concrete is practical as it offers good concrete properties as well as it can be mixed, placed easier without compaction. 

Determination of the metal toughness components in impact-bending test

2018 ◽  
Vol 84 (12) ◽  
pp. 68-72
Author(s):  
A. B. Maksimov ◽  
I. P. Shevchenko ◽  
I. S. Erokhina
Keyword(s):  
Crack Growth ◽  
Specific Energy ◽  
Crack Formation ◽  
Crack Nucleation ◽  
Scale Effects ◽  
Linear Equations ◽  
Bending Test ◽  
Cross Sectional ◽  
Two Samples ◽  
Sample Width

A method for separating the work of impact into two parts - the work of the crack nucleation and that of crack growth - which consists in testing two samples with the same stress concentrators and different cross-sectional dimensions at the notch site is developed. It is assumed that the work of crack nucleation is proportional to the width of the sample face on which the crack originates and the specific energy of crack formation, whereas the work of the crack growth is proportional to the length of crack development and the specific crack growth energy. In case of the sample fracture upon testing, the crack growth length is assumed equal to the sample width. Data on the work of fracture of two samples and their geometrical dimensions at the site of the notch are used to form a system of two linear equations in two unknowns, i.e., the specific energy of crack formation and specific energy of crack growth. The determined specific energy values are then used to calculate the work of crack nucleation and work of crack growth. The use of the analytical method improves the accuracy compared to graphical - extrapolative procedures. The novelty of the method consists in using one and the same form of the notch in test samples, thus providing the same conditions of the stress-strain state for crack nucleation and growth. Moreover, specimens with different cross-section dimensions are used to eliminate the scale effects. Since the specific energy of the crack nu-cleation and specific energy of the crack growth are independent of the scale factor, they are determined only by the properties of the metal. Introduction the specific energy of crack formation and growth makes possible to assign a specific physical meaning to the fracture energy.

Sign in / Sign up

Export Citation Format

Share Document