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Section 5:
Deleterious Materials
Deleterious Materials
Weak or low quality particles or
coatings found on or mixed with
coarse aggregate
• “bad guys”
Affect bond between cements and
aggregates
Break up during mixing and use
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Identification and Impact of Deleterious Materials in Concrete, Study notes of Civil Engineering
The concept of deleterious materials in concrete, their sources, and the negative effects they have on the bond between cement and aggregates. Deleterious materials include organic coatings, dust, clay lumps, shale, coal particles, chert, lignite, limonite, and badly weathered, soft, and lightweight particles. These impurities can break up during mixing and use, affecting the overall quality and durability of the concrete.
What you will learn
- What are deleterious materials in concrete?
- What are the sources of deleterious materials in concrete?
- How do deleterious materials affect the bond between cement and aggregates?
Typology: Study notes
2021/2022
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1
Section 5:
Deleterious Materials
Deleterious Materials
Weak or low quality particles or
coatings found on or mixed with
coarse aggregate
- “bad guys”
Affect bond between cements and
aggregates
Break up during mixing and use
2
Deleterious Materials
Include …
- organic coating
- dust
- clay lumps, shale, coal particles
- chert (breaks up during freezing and thawing)
- lignite and limonite
- badly weathered, soft and lightweight particles
Deleterious Materials