How do you measure moisture content of coarse aggregate?
Do not use the combined weight of the sample container plus the aggregate sample. Then divide the weight of the moisture held by the aggregate by the weight of the sufficiently dried sample. Then multiply this value by 100. The resulting value is the aggregate moisture content as a percent.
What is the moisture content of coarse aggregate?
Absorption and Surface Moisture The range for most normal-weight aggregates is 1 – 2%.
What are the 4 major moisture conditions for aggregates?
In general, there are four aggregate moisture conditions:
- Oven-dry (OD). All moisture is removed by heating the aggregate in an oven at 105°C (221°F) to constant weight (this usually constitutes heating it overnight).
- Airdry (AD).
- Saturated surface dry (SSD).
- Wet.
What is the maximum water content for 20 mm size of aggregate?
Mix Design
| M-20 CONCRETE MIX DESIGN | ||
|---|---|---|
| As per IS 10262-2009 & MORT&H | ||
| 9 | Water Absorption of 10 mm Aggregate | 0.83% |
| 10 | Water Absorption of Sand | 1.23% |
| 11 | Free (Surface) Moisture of 20 mm Aggregate | nil |
Why do we measure moisture content of aggregates?
It’s important to determine the moisture content of aggregate prior to mixing, because it affects the proportion of mix water needed to achieve the desired water/cementitious materials ratio.
How do you test aggregates?
Following are the different types of aggregate tests conducted to ascertain the suitability of aggregates:
- Crushing Test on Aggregates.
- Abrasion Test on Aggregates.
- Impact Test on Aggregates.
- Soundness Test on Aggregates.
- Shape Test on Aggregates.
- Specific Gravity and Water Absorption Test on Aggregates.
What is moisture content test?
The method is based on removing soil moisture by oven-drying a soil sample until the weight remains constant. The moisture content (%) is calculated from the sample weight before and after drying. SPECIAL APPARATUS. For fine-grained soils (maximum particle size 2 mm)
Why do we determine the moisture content of aggregates?
What are the properties of coarse aggregate?
Properties of Coarse Aggregates
- Composition.
- Size and Shape.
- Surface Texture.
- Specific Gravity.
- Bulk Density.
- Voids.
- Porosity and Absorption.
- Bulking of Sand.
What is the maximum water content for 25 to 50 mm slump with 20 mm coarse aggregate?
From Table 2 of IS 10262:2009, maximum water content for 20 mm aggregate = 186 litre (for 25 to 50 mm slump range) Estimated water content for 100 mm slump = 186+ (6/186) = 197 litre.
What is the moisture content of an aggregate?
MOISTURE CONTENT • A high moisture content increases the W/C ratio to an appreciable extent. • The surface moisture expressed as a % of the weight of the saturated surface dry aggregate is known as moisture content. 21.
How to determine the moisture content of a sample?
Determine the moisture content of the representative aggregate sample. Once the sample is determined to be sufficiently dry, subtract the weight of the sufficiently dried sample from the weight of the original representative aggregate sample. The resulting value is the weight of the moisture held by the aggregate.
How much sand is needed for moisture test?
For coarse aggregate, a 2 kg sample is required but for the sand (fine aggregate), a 0.5 kg sample is adequate. The wet/moist sample is then weighted as wet weight (W).
Why does coarse aggregate have a higher bulk density?
BULK DENSITY & VOIDS • Depends upon particle size , grading and moisture content. • A higher bulk density of coarse aggregate is an indication of fewer voids to be filled by sand and cement. • If the voids are more in the concrete , the strength will be low. 19.