The document discusses deleterious materials found in aggregates, which are essential in construction. It details various harmful substances such as organic impurities, clay lumps, coal, and salts, explaining their negative impacts on concrete performance, including reduced durability and bond strength. The information emphasizes the importance of assessing and managing these materials to ensure optimal concrete quality.

1. DELETERIOUS MATERIALS IN
AGGREGATES
BY GEET

2. INTRODUCTION
 WE ALL KNOW THAT "AGGREGATE", IS
MATERIAL MAINLY USED IN
CONSTRUCTION.
 IT MAY BE -SAND, GRAVEL, CRUSHED
STONE, SLAG, RECYCLED CONCRETE AND
GEOSYNTHETIC AGGREGATES .
 AGGREGATES ARE THE MOST MINED
MATERIALS IN THE WORLD.
 THE AGGREGATE SERVES AS
REINFORCEMENT TO ADD STRENGTH TO
THE OVERALL COMPOSITE MATERIAL.

3. WHAT IS DELETERIOUS MATERIAL
DELETERIOUS MATERIAL
-THEY ARE HARMFUL OR INJURIOUS SUBSTANCES
(COATINGS) FOUND IN THE SURFACE OF THE AGGREGATE
.
-THEY ARE HARMFUL TO CONCRETE PERFORMANCE.
-THESE SUBSTANCE AFFECT OR WEAKENS THE BOND B/W
CEMENT & AGGREGATE AND BREAK EASILY
THEY MAY BE
 SALT
 ORGANIC IMPURITIES
 CLAY LUMPS &FRIABLE PARTICLES(EASILY CRUMBLED)
 COAL ,LIGNITE
 LIGHTWEIGHT CHERTS.

4. IMPACTS OF EACH TYPES ON CONCRETE PROPERTIES
AND PERFORMANCE
ORGANIC IMPURITIES-
 USUALLY OF PRODUCTS OF DECAY OF VEGETABLE
MATTER
 INTERFERE WITH THE PROCESS OF HYDRATION OF
CEMENT.
 TO DETERMINE THE ORGANIC CONTENT OF
AGGREGATE, COLORIMETRIC TEST RECOMMENDED BY
ASTM.
 ASTM-INTERNATIONAL STANDARDS ORGANIZATION THAT
DEVELOPS TECHNICAL STANDARDS FOR A WIDE RANGE OF
MATERIALS, PRODUCTS, SYSTEMS, AND SERVICES

5. CLAY LUMPS AND OTHER FRIABLE
PARTICLES
CLAY MAY COAT THE SURFACE OF
AGGREGATES WHICH WEAKENS BOND STRENGTH
BETWEEN AGGREGATE AND CEMENT PASTE.
OTHER PARTICLES MAY BE IN THE FORM OF
-SILT
-CRUSHED DUST
IMPACTS ON CONCRETE
1.LOW WEAR RESISTANCE
2. REDUCE DURABILITY
3. MAY RESULT POPOUTS

6. LIGNITE AND COAL
THESE MATERIALS MAY
1. RESULT STRAINING ON
CONCRETE
2. CAUSE POPOUTS
3. AIR ENTRAPMENT
LIGNITE COAL
AIR PORESSTARIN

7. SALT PARTICLES
SAND FROM SEASHORE OR A RIVER ,
AS WELL AS DESERT SAND CONTAINS
SALT.
IMPACTS -
1. REINFORCEMENT CORROSION
2. ABSORB MOISTURE AND CAUSE
EFFLORESCENCE
EFFLORESCENCE
CORROSION

8. LIGHTWEIGHT CHERT
 CHERT IS A MICROCRYSTALLINE
SEDIMENTARY ROCK MATERIAL COMPOSED
OF SILICON DIOXIDE (SIO2)
 LIGHTWEIGHT MEANS HAVING SPECIFIC
GRAVITY OF LESS THAN 2.40.
THEY MAY RESULT
1. REDUCED DURABILITY
2. POPOUTS
CHERT

9. Good

10. FAILURE
EXAMPLES

12. THANK YOU
HAVE A GREAT
DAY