This standard outlines the procedure to quantify the capillary water absorption of acrylic polymer-based waterproofing coatings applied on aerated concrete substrates. The test evaluates water uptake over a specified immersion period, offering essential data to verify the effectiveness and durability of waterproofing layers. It is primarily utilized by professionals involved in material manufacturing, testing, and quality assurance within construction and waterproofing sectors.
Overview
This standard outlines the procedure to quantify the capillary water absorption of acrylic polymer-based waterproofing coatings applied on aerated concrete substrates. The test evaluates water uptake over a specified immersion period, offering essential data to verify the effectiveness and durability of waterproofing layers. It is primarily utilized by professionals involved in material manufacturing, testing, and quality assurance within construction and waterproofing sectors.
Audience
Contents
Structure
This section defines the scope of the standard, detailing the method to assess capillary water absorption in acrylic polymer waterproofing coatings applied on aerated concrete slabs.
[ \text{Capillary Water Absorption} = \frac{W_2 - W_1}{V_{24}} = 0.204 \times (W_2 - W_1) ]
Where:
| Symbol | Description |
|---|---|
| (W_1) | Weight of coated specimen after 28 days conditioning (kg) |
| (W_2) | Weight of coated specimen after 24-hour water immersion (kg) |
| (V_{24}) | Specimen volume in liters (assumed as 4.9 L for given dimensions) |
This approach facilitates standardized quality control and performance verification of waterproofing materials according to BIS criteria.
flowchart TD
A[Cut Specimen (240×240×45 mm)] --> B[Condition for 28 Days]
B --> C[Weigh Specimen (W1)]
C --> D[Immerse in Water for 24 Hours]
D --> E[Reweigh Specimen (W2)]
E --> F[Compute Capillary Water Absorption]
F --> G[Document Results]
Note: Numerical results should be rounded off following IS 2:1960.
[ \text{Capillary water absorption} = \frac{W_2 - W_1}{V} \times 24 = 0.204 \times (W_2 - W_1) ]
Where:
Note: The factor 0.204 normalizes the absorption based on specimen volume and time.
| Parameter | Value |
|---|---|
| Specimen Size | 240 mm × 240 mm × 45 mm |
| Density Range | 451–550 kg/m³ |
| Number of Samples | ≥ 3 |
| Conditioning Period | 28 days |
| Water Immersion Time | 24 hours |
This standard method quantifies water penetration in acrylic polymer coatings, ensuring waterproofing quality as per IS 13435 Part 3.
[ \text{Capillary water absorption} = 0.204 \times (w_2 - w_1) ]
Where:
flowchart TD
A[Prepare Aerated Concrete Slabs] --> B[Condition for 28 Days]
B --> C[Record Weight w1]
C --> D[Immerse in Water for 24 Hours]
D --> E[Record Weight w2]
E --> F[Calculate Water Absorption]
F --> G[Report Findings]
This ensures uniform evaluation of acrylic polymer waterproofing materials’ resistance to water ingress.
[ \text{Capillary water absorption} = 0.204 \times (W_2 - W_1) \quad \text{(kg/m}^2\text{)} ]
Where:
Include:
flowchart TD
A[Cut Aerated Concrete Slabs] --> B[Apply Acrylic Polymer Coating]
B --> C[Allow to Dry and Condition for 28 Days]
C --> D[Weigh Specimen (W1)]
D --> E[Immerse in Water for 24 Hours]
E --> F[Weigh Specimen (W2)]
F --> G[Calculate Capillary Water Absorption]
G --> H[Prepare Test Report]
This procedure standardizes evaluation of waterproofing effectiveness as per IS 13435 Part 3.
[ \text{Capillary Water Absorption} = 0.204 \times (W_2 - W_1) ]
Where:
flowchart TD
A[Specimen Preparation] --> B[Condition for 28 Days]
B --> C[Weight Measurement W1]
C --> D[Water Immersion for 24 Hours]
D --> E[Weight Measurement W2]
E --> F[Calculate Water Absorption = 0.204 × (W2 - W1)]
F --> G[Compile and Report Results]
This approach standardizes capillary water uptake assessment for acrylic polymer coatings.
[ \text{Capillary water absorption} = \frac{W_2 - W_1}{A \times t} ]
Where:
The standard simplifies this to: [ = 0.204 \times (W_2 - W_1) ]
| Parameter | Description |
|---|---|
| Preparation Date | Date of sample fabrication |
| Water Immersion Date | Date when immersed in water |
| Testing Date | Date of final weighing |
| Average Absorption | Mean value from samples |
flowchart TD
A[Prepare Specimens] --> B[Condition for 28 Days]
B --> C[Initial Weighing (W1)]
C --> D[Immerse in Water for 24 Hours]
D --> E[Final Weighing (W2)]
E --> F[Calculate Capillary Absorption]
F --> G[Report with Dates and Average]
This ensures uniform reporting for capillary water absorption in acrylic polymer waterproofing materials as per IS 13435 Part 3.
[ \text{Capillary water absorption} = \frac{W_2 - W_1}{A \times t} ]
Where:
The standard provides a simplified expression: [ \text{Capillary water absorption} = 0.204 \times (W_2 - W_1) ]
flowchart TD
A[Specimen Preparation] --> B[Condition for 28 Days]
B --> C[Weigh Specimens (W1)]
C --> D[Immerse in Water for 24 Hours]
D --> E[Weigh Specimens (W2)]
E --> F[Calculate Capillary Absorption]
F --> G[Document Results with Dates and Averages]
This ensures accurate and reproducible measurement of water penetration resistance of acrylic polymer waterproofing coatings.
Frequently Asked
Per IS 13435 Part 3 (clause 3(a) and December 2000 amendment), the test specimens are aerated concrete slabs measuring 240 mm by 240 mm by 45 mm. These slabs have a density ranging from 451 to 550 kg/m³, typically around 500 kg/m³, and are manufactured according to IS 2185 (Part 3): 1984, Grade 1 blocks sized 600 mm × 250 mm × 200 mm. This ensures consistency and reproducibility in waterproofing tests.
The acrylic polymer waterproofing material must be uniformly applied to the surface of aerated concrete slabs and allowed to dry fully. Subsequently, the slab edges are sealed using a polyurethane finish to prevent lateral water absorption. The coated specimens are then conditioned for 28 days at a controlled environment of 27 ± 2°C temperature and 65 ± 5% relative humidity. Before testing, the specimens are weighed and placed coating-side down into a plastic pan containing 10 mm depth of water for the capillary water uptake assessment. This procedure ensures consistent moisture conditions and reliable testing results.
The procedure involves preparing aerated concrete slabs (240 mm × 240 mm × 45 mm, density ~500 kg/m³) coated with acrylic polymer and conditioned for 28 days. The conditioned specimen is weighed (W1), then submerged in water for 24 hours. After immersion, it is removed and weighed again (W2). At least three specimens are tested for accuracy. The capillary water absorption is calculated using the formula: 0.204 × (W2 - W1) kg/m². The test results along with dates of preparation, immersion, and testing are documented.
Capillary water uptake is calculated by subtracting the weight after conditioning (W1) from the weight after 24-hour water immersion (W2), then multiplying by 0.204 to normalize for specimen volume and time. The formula is: Capillary water uptake = 0.204 × (W2 - W1). Test reports must include dates of sample preparation, water immersion, and testing, along with the average capillary water uptake from a minimum of three specimens. Weights and calculations should follow rounding norms specified in IS 2:1960.
During the 28-day conditioning period, specimens must be kept at a temperature of 27 ± 2°C and relative humidity of 65 ± 5%. These controlled environmental conditions ensure moisture equilibrium and proper curing of the acrylic polymer coating on aerated concrete slabs (240 mm × 240 mm × 45 mm, density ~500 kg/m³). Proper conditioning is critical to obtain reliable and consistent capillary water absorption test results.
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