scholarly journals The Reflective Cracking in Flexible Pavements

2013 ◽  
Vol 2 (1) ◽  
pp. 63-87 ◽  
Author(s):  
Jorge Pais
Keyword(s):  
Numerical Modeling ◽  
Stress Concentration ◽  
Crack Opening ◽  
Propagation Rate ◽  
Traffic Load ◽  
Shear Mode ◽  
Road Maintenance ◽  
Reflective Cracking ◽  
Maintenance And Rehabilitation ◽  
Pavement Overlay

Abstract Reflective cracking is a major concern for engineers facing the problem of road maintenance and rehabilitation. The problem appears due to the presence of cracks in the old pavement layers that propagate into the pavement overlay layer when traffic load passes over the cracks and due to the temperature variation. The stress concentration in the overlay just above the existing cracks is responsible for the appearance and crack propagation throughout the overlay. The analysis of the reflective cracking phenomenon is usually made by numerical modeling simulating the presence of cracks in the existing pavement and the stress concentration in the crack tip is assessed to predict either the cracking propagation rate or the expected fatigue life of the overlay. Numerical modeling to study reflective cracking is made by simulating one crack in the existing pavement and the loading is usually applied considering the shear mode of crack opening. Sometimes the simulation considers the mode I of crack opening, mainly when temperature effects are predominant.

scholarly journals ANALISIS TEBAL PERKERASAN JALAN RAYA MAGELANG-PURWOREJO KM 8 SAMPAI KM 9 MENGGUNAKAN METODE BINA MARGA 1987

2018 ◽  
Vol 2 (1) ◽  
Author(s):  
Sudarno Sudarno ◽  
Lulut Fadhilah ◽  
Achmad Afif ◽  
Siti Nurobingatun ◽  
Heru Hariyadi ◽  
...  
Keyword(s):  
Carrying Capacity ◽  
Secondary Data ◽  
Traffic Load ◽  
Cone Penetrometer ◽  
The Road ◽  
Dynamic Cone Penetrometer ◽  
Road Pavement ◽  
Central Java ◽  
Key Word ◽  
Pavement Overlay

<p>Abstrak. The Highway that connect Magelang Purworejo is one of the Collector roads in Central Java. Magelang-Purworejo’s Highway has a fairly high traffic load, based on a survey conducted by LHR in 2017 of 4392 vehicles. A high enough amount of LHR causes the road to damage the hair cracked. Based on the above, the thickness of the pavement or overlay is planned. This plan begins with a survey of the number of passing vehicles for twenty-four hours (LHR), then surveying the carrying capacity of ground using DCP tools, then measuring the skill of using digital teodholit. Then look for references and secondary data in the form of traffic growth, rainfall data and road class data. After all the data obtained then calculated the thickness of road pavement using the method of Bina Marga 1987. Based on these calculations obtained the required re-layer is 3 cm.</p><p><br />Key word: road pavement, overlay, dynamic cone penetrometer</p>

scholarly journals Strain field evolution at the ductile-to-brittle transition: a case study on ice

Solid Earth ◽  
2017 ◽  
Vol 8 (5) ◽  
pp. 943-953 ◽  
Author(s):  
Thomas Chauve ◽  
Maurine Montagnat ◽  
Cedric Lachaud ◽  
David Georges ◽  
Pierre Vacher
Keyword(s):  
Stress Concentration ◽  
Dynamic Recrystallization ◽  
Strain Field ◽  
Crack Opening ◽  
Local Stress ◽  
Image Correlation ◽  
Brittle Transition ◽  
Field Evolution ◽  
Crack Tips ◽  
Ductile To Brittle Transition

Abstract. This paper presents, for the first time, the evolution of the local heterogeneous strain field around intra-granular cracking in polycrystalline ice, at the onset of tertiary creep. Owing to the high homologous temperature conditions and relatively low compressive stress applied, stress concentration at the crack tips is relaxed by plastic mechanisms associated with dynamic recrystallization. Strain field evolution followed by digital image correlation (DIC) directly shows the redistribution of strain during crack opening, but also the redistribution driven by crack tip plasticity mechanisms and recrystallization. Associated local changes in microstructure induce modifications of the local stress field evidenced by crack closure during deformation. At the ductile-to-brittle transition in ice, micro-cracking and dynamic recrystallization mechanisms can co-exist and interact, the later being efficient to relax stress concentration at the crack tips.

scholarly journals Numerical Modeling of the Dynamic Load Changes Exerted on the Support in the Stress Concentration Zones

2017 ◽  
Vol 191 ◽  
pp. 894-899 ◽  
Author(s):  
Wojciech Masny ◽  
Stanisław Prusek ◽  
Grzegorz Mutke
Keyword(s):  
Numerical Modeling ◽  
Stress Concentration ◽  
Dynamic Load

Research on Pavement Characteristics of Epoxy Resin and Rubber Modified Asphalt

2010 ◽  
Vol 150-151 ◽  
pp. 433-440
Author(s):  
Rong Hui Zhang ◽  
Jing Jing Duan ◽  
Ying Mei Yin
Keyword(s):  
Epoxy Resin ◽  
Elastic Recovery ◽  
Asphalt Mixture ◽  
Propagation Speed ◽  
Traffic Load ◽  
Reflective Cracking ◽  
Simulation Test ◽  
The Road ◽  
Marshall Test ◽  
As Stress

An asphalt modified by epoxy resin and rubber has the following improved properties: the softening point is 70 , elastic recovery rate is 80%, and kinematic viscosity at 175 is 2879.1mm2 /s. In order to solve the early curing in the process of mixing, storage and transportation, methyl hexahydrophthalic anhydride(MHHPA) was used as the curing agent. A reflective cracking caused by traffic load simulation test was established with the objective to compare the propagation speed of reflective crack of three different structure asphalt mixture samples. The results showed that the sample with epoxy resin and rubber used as stress-absorbing layer can obviously delay reflective cracking, improve the pavement performance and prolong the road life. Furthermore, the results of Marshall test, immersion Marshall test and Rutting test were consistent with the results of the reflective crack simulation test.

scholarly journals Pemodelan Numerik Kekuatan Pintu Air Baja

2021 ◽  
Vol 9 (2) ◽  
pp. 116-123
Author(s):  
Fitriansyah Fitriansyah ◽  
Miftahul Iman ◽  
Aminullah Aminullah
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Modeling ◽  
Stress Concentration ◽  
Stress Reduction ◽  
Pitting Corrosion ◽  
Open Channel ◽  
Computer Programs ◽  
Distribution Area ◽  
Door Opening

The intake building for Embung Sei Bubu had been designed to be an open channel with the flood gate. The flood gate had been designed from steel with a net width of 1.35 m and the height of the door opening is 0.0076 m. The corrosion is one of the hazardous threat to the strengthness and durability of the flood gate. This research numerically models flood gate that was attacked by pitting corrosion. The pitting corrosion had been modelled in several small holes randomly were distributed on the surface of the flood gate, precisely on the surface of the water. The numerical modeling had been performed in finite element method utilized computer programs such Abaqus. The results showed there was a reduction in the capacity of the steel flood gate due the hole increasing. The reduction in stress capacity had been indicated by the stress concentration that was occured around the pitting corrosion. The stress reduction occured with the change in the percentage of pitting corrosion distribution area of ​​10% (225 MPa), 20% (175 MPa) and 30% (120 MPa)

Sign in / Sign up

Export Citation Format

Share Document