Quality identification of waterproof materials

waterproof material is based on the core principle of molecular structure density and interfacial bonding synergy, and achieves a balance between impermeability and durability by optimizing polymer modification, fiber reinforcement and lamination composite processes. It is widely used in building roofs, underground engineering, water conservancy facilities, rail transit and other fields. In construction projects, it is used for basement waterproofing and bathroom leakage prevention; in municipal projects, it ensures the water pressure resistance of tunnel linings; in water conservancy scenarios, it achieves erosion protection on the dam's front surface; in the transportation field, it meets the joint sealing requirements between subway shield zones. Compared with traditional waterproof membranes, waterproof materials have the characteristics of high tensile strength, large elongation, and strong root puncture resistance. They are the core component of modern engineering waterproofing systems.

Zhongke Testing is a product quality appraisal service organization registered with the court. It can provide waterproof material quality appraisal services. It has a professional appraisal team and advanced instruments and equipment to provide fair and accurate appraisal results for waterproof material quality appraisal.

With the upgrade of waterproofing engineering standards, related quality dispute cases have increased significantly. The judicial dispute focuses on:

1. Dispute over performance indicators: Whether the measured impermeability pressure meets the standard and whether the low-temperature bending property meets the national standard;

2. Material defects: The content of SBS modified asphalt coil asphalt coating material is insufficient, and the proportion of butyl rubber in the polymer self-adhesive film is incorrect. Compliance with standards;

3. Process problems: out-of-control temperature during hot-melt construction resulted in burnout of the coil and insufficient peel strength of the pre-paved anti-adhesive layer;

4. Contract performance dispute: the type of delivered material (such as replacing polyurethane coating with acrylic coating), thickness or tire base specifications did not match the technical agreement.

The quality appraisal of waterproof materials requires systematic technical means:

1. Appearance inspection: observe defects such as surface cracks, paint conjunctival bubbles, and joint detachment;

2. Performance testing: use an impermeability meter to measure the water pressure resistance, a low temperature chamber to verify the bending performance, and a tensile machine to detect tensile strength and elongation at break;

3, material analysis: identify the type of polymer modification through infrared spectrometer, and determine the content of asphalt coating material with thermogravimetric analyzer;

4, construction verification: use ultrasonic measurement The thickness meter detects the uniformity of coating thickness, and the peeling test evaluates the bonding strength between the roll and the base layer;

The applicant, a real estate company, signed a "Polymer Self-adhesive Waterproofing Membrane Purchase Contract" with a building materials company, the respondent, to purchase 5,000 square meters for underground garage roof waterproofing. Three months after the acceptance, a large area of leakage appeared in the roof. The real estate company accused the coil of quality defects, and the building materials company argued that it was caused by damage to the backfill construction machinery.

identification analysis results:

The quality analysis expert group discussed and comprehensively analyzed the relevant information of "waterproof materials", contract technical agreements, on-site inspection case materials and other data, and made the following quality analysis opinions: HTMLTAG The thickness of the butyl rubber layer of TOKEN5

involved in the case is only 0.8mm (contract requirement ≥1.2mm), and the peel strength is only 0.8N/mm (standard ≥1.5N/mm); the longitudinal and transverse tension ratio deviation of the tire base reaches 30% (standard ≤15%), resulting in anisotropic shrinkage and cracking; the mass loss rate after thermal aging is 8.5% (standard ≤5%).

The appraisal conclusion concluded that the building materials company failed to control the thickness of the adhesive layer and the uniformity of the tire base according to the technical agreement, and material defects were the main cause of leakage.

waterproof material quality appraisal report mainly includes the following contents:

1. Client information

2. Appraisal equipment information

3. Appraisal basis (standards, power of attorney, etc.)

4. Identification method