Monday, August 15, 2022
SCIENMAG: Latest Science and Health News
No Result
View All Result
  • Login
  • HOME PAGE
  • BIOLOGY
  • CHEMISTRY AND PHYSICS
  • MEDICINE
    • Cancer
    • Infectious Emerging Diseases
  • SPACE
  • TECHNOLOGY
  • CONTACT US
  • HOME PAGE
  • BIOLOGY
  • CHEMISTRY AND PHYSICS
  • MEDICINE
    • Cancer
    • Infectious Emerging Diseases
  • SPACE
  • TECHNOLOGY
  • CONTACT US
No Result
View All Result
Scienmag - Latest science news from science magazine
No Result
View All Result
Home SCIENCE NEWS Chemistry AND Physics

Causes of concrete and asphalt deterioration explained

May 13, 2021
in Chemistry AND Physics
0
Share on FacebookShare on Twitter

IMAGE

Credit: Akihiro Moriyoshi, et al. PLOS ONE. May 13, 2021

Scientists reveal that the deterioration of modern concrete and asphalt structures is due to the presence of trace quantities of organic matter in these structures.

Cement and asphalt are vital to modern construction materials; cement is used for the construction of various buildings and structures, while asphalt is primarily used for highways and runways. They have been widely used for these purposes since the 1800s. It has been observed modern concrete structures and asphalt structures tend to deteriorate much faster than historical structures, but the reason for this phenomenon was unknown.

A team of scientists from six institutions, including Akihiro Moriyoshi, Emeritus Professor Hokkaido University, have revealed that the presence of trace quantities of organic matter in modern concrete structures and asphalt pavements drive the deterioration of these structures. Their findings, which include novel methods to assess deterioration, were published in the journal PLOS ONE.

The deterioration of modern concrete structures and asphalt pavements are a major issue. The features that lead to deterioration include cracks, disaggregation (breakdown into fine white powder) and delamination (separation into layers). These deteriorated structures are unsafe for their intended purposes; rapid deterioration reduces the expected lifespan of structures, thereby increasing the costs for maintenance or replacement.

The scientists set out to develop a new method to assess the rate of deterioration in concrete. The current method is based on the width of surface cracks in concrete and a simple chemical test; however, it only gives an incomplete picture of the level of damage. During their experiments, the scientists happened to notice that a strange odor developed when commercial cement was mixed with water. They hypothesized that organic matter was responsible for the odor, and investigated the effect it has on deterioration of concrete.

The scientists developed the one-dimensional transient moisture permeation apparatus to accurately reproduce the field environmental conditions that concrete structures and asphalt pavements are exposed to, in the laboratory, over a period of 24 hours. When combined with CT scans, this method can be used to evaluate the precise extent of the damage. They tested a variety of asphalt samples from Japan dating back to 1960; a number of concrete samples from across the world were also tested, and a 120-year-old concrete sample was used as a reference.

The scientists showed that there are a number of organic molecules, from diverse sources, present in modern concrete structures and asphalt pavements: phthalates, diesel exhaust particulates, surfactants, and windshield washer fluids. These molecules are either introduced during the manufacturing process — the contents of phthalates, phosphate compounds, and AE water reducing agents present in commercially available cements are 0.0012%, 0.12%, and 0.25%, respectively — or absorbed from the environment, and cause rapid deterioration of concrete structures and asphalt pavements.

Of the organic matter present in cement, phthalates have the highest effect on deterioration more than phosphates and AE water reducing agents. Organic matter in water accelerates deterioration of asphalt pavements. The scientists also showed that crack width and length is the best determinant of concrete damage, while the degree of formation of amorphization is the best determinant of deterioration. They believe that their findings can be used to develop novel formulations for long-lasting concrete structures and asphalt pavements.

###

Media Contact
Sohail Keegan Pinto
[email protected]

Original Source

https://www.global.hokudai.ac.jp/blog/causes-of-concrete-and-asphalt-deterioration-explained/

Related Journal Article

http://dx.doi.org/10.1371/journal.pone.0249761

Tags: Civil EngineeringMaterialsTechnology/Engineering/Computer Science
Share25Tweet16Share4ShareSendShare
  • Amanda Poholek, Ph.D.

    Reinvigorating ‘lost cause’ exhausted T cells could improve cancer immunotherapy

    137 shares
    Share 55 Tweet 34
  • Nuclear war would cause a global famine and kill billions, Rutgers-led study finds

    65 shares
    Share 26 Tweet 16
  • The best way to take pills according to science

    65 shares
    Share 26 Tweet 16
  • 1 in 3 parents worry that school traffic is a danger for kids

    65 shares
    Share 26 Tweet 16
  • Exercise answer: Research shows it’s how often you do it, not how much

    64 shares
    Share 26 Tweet 16
  • The North American Menopause Society releases its 2022 Hormone Therapy Position Statement

    149 shares
    Share 60 Tweet 37
ADVERTISEMENT

About us

We bring you the latest science news from best research centers and universities around the world. Check our website.

Latest NEWS

Reinvigorating ‘lost cause’ exhausted T cells could improve cancer immunotherapy

Experts optimistic about converting coal plants to production of clean geothermal energy

A role for cell ‘antennae’ in managing dopamine signals in the brain

Subscribe to Blog via Email

Enter your email address to subscribe to this blog and receive notifications of new posts by email.

Join 193 other subscribers

© 2022 Scienmag- Science Magazine: Latest Science News.

No Result
View All Result
  • HOME PAGE
  • BIOLOGY
  • CHEMISTRY AND PHYSICS
  • MEDICINE
    • Cancer
    • Infectious Emerging Diseases
  • SPACE
  • TECHNOLOGY
  • CONTACT US

© 2022 Scienmag- Science Magazine: Latest Science News.

Welcome Back!

Login to your account below

Forgotten Password?

Retrieve your password

Please enter your username or email address to reset your password.

Log In