Gel-Space Ratio for Complete Hydration Calculator

Gel Space Ratio Formula:

\[ GS = \frac{0.657 \times C}{(0.319 \times C) + W_o} \]

Gel Space Ratio:

Percentage:

1. What is Gel-Space Ratio?

Definition: The Gel-Space Ratio is the ratio of the volume of cement gel to the sum of the volume of cement gel and that of the capillary pores.

Purpose: It helps in understanding the hydration process of cement and predicting the strength and durability of concrete.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ GS = \frac{0.657 \times C}{(0.319 \times C) + W_o} \]

Where:

\( GS \) — Gel Space Ratio (dimensionless)
\( C \) — Mass of cement (grams)
\( W_o \) — Volume of mixing water (milliliters)

Explanation: The formula calculates the ratio between the solid gel products of hydration and the total space available (gel plus capillary pores).

3. Importance of Gel-Space Ratio

Details: A higher gel-space ratio indicates better hydration and typically results in stronger, more durable concrete. The theoretical maximum is about 0.68.

4. Using the Calculator

Tips: Enter the mass of cement in grams and volume of mixing water in milliliters. The result includes a ±5% margin to account for measurement variations.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical gel-space ratio value?
A: For complete hydration, the ratio typically ranges between 0.6 and 0.68.

Q2: Why is there a ±5% margin?
A: The margin accounts for measurement inaccuracies and variations in material properties.

Q3: How does water-cement ratio affect the gel-space ratio?
A: Higher water-cement ratios generally result in lower gel-space ratios as more capillary pores remain.

Q4: What does the 0.657 and 0.319 represent in the formula?
A: These are empirical constants derived from the chemistry of cement hydration.

Q5: Can this be used for all cement types?
A: The formula works best for ordinary Portland cement. Other cement types may require adjusted constants.