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During the test of OPC for loss on ignition, the loss in weight occurs due to: (a) decomposition of silicates, (b) chemical reaction, (c) evaporation of moisture and carbon dioxide, (d) burning of constituents?
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During the test of OPC for loss on ignition, the loss in weight occurs...
During the test of OPC for loss on ignition, the loss in weight occurs due to:

1. Decomposition of silicates
2. Chemical reaction
3. Evaporation of moisture and carbon dioxide
4. Burning of constituents

1. Decomposition of silicates:
- OPC (Ordinary Portland Cement) is mainly composed of calcium silicates, such as tricalcium silicate (C3S) and dicalcium silicate (C2S).
- During the loss on ignition test, the sample is heated to a high temperature, typically around 900-1000°C.
- At this temperature, the silicate compounds in OPC undergo thermal decomposition.
- The decomposition of silicates results in the release of carbon dioxide and water vapor, leading to a loss in weight of the sample.

2. Chemical reaction:
- OPC contains various chemical compounds, including calcium carbonate (CaCO3) and calcium sulfate (CaSO4).
- When the sample is heated, these compounds undergo chemical reactions.
- Calcium carbonate decomposes to form calcium oxide (CaO) and carbon dioxide (CO2).
- Calcium sulfate undergoes dehydration, converting to calcium oxide and water vapor.
- These chemical reactions contribute to the loss in weight observed during the test.

3. Evaporation of moisture and carbon dioxide:
- OPC may contain moisture and adsorbed carbon dioxide from the atmosphere.
- During the loss on ignition test, the sample is heated to a high temperature, causing the evaporation of moisture and the release of adsorbed carbon dioxide.
- The evaporation of moisture and carbon dioxide leads to a reduction in weight.

4. Burning of constituents:
- OPC contains organic compounds, such as fuel residues and admixture components.
- When the sample is heated, these organic compounds undergo combustion or burning.
- The burning of organic constituents results in the liberation of carbon dioxide, water vapor, and other volatile gases, leading to a loss in weight.

In conclusion, the loss in weight observed during the loss on ignition test of OPC is primarily due to the decomposition of silicates, chemical reactions, evaporation of moisture and carbon dioxide, and the burning of organic constituents. These processes contribute to the release of gases and water vapor, leading to a reduction in the weight of the sample.
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During the test of OPC for loss on ignition, the loss in weight occurs due to: (a) decomposition of silicates, (b) chemical reaction, (c) evaporation of moisture and carbon dioxide, (d) burning of constituents?
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During the test of OPC for loss on ignition, the loss in weight occurs due to: (a) decomposition of silicates, (b) chemical reaction, (c) evaporation of moisture and carbon dioxide, (d) burning of constituents? for Civil Engineering (CE) 2025 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about During the test of OPC for loss on ignition, the loss in weight occurs due to: (a) decomposition of silicates, (b) chemical reaction, (c) evaporation of moisture and carbon dioxide, (d) burning of constituents? covers all topics & solutions for Civil Engineering (CE) 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for During the test of OPC for loss on ignition, the loss in weight occurs due to: (a) decomposition of silicates, (b) chemical reaction, (c) evaporation of moisture and carbon dioxide, (d) burning of constituents?.
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