Methods of test for autoclaved cellular concrete products, Part IX: Jointing of autoclaved cellular concrete elements
1973 الطبعة

The standard specifies preparing a series of three specimens, each comprising three joined elements measuring 0.5 meters in length. The elements must conform to the relevant IS or manufacturer's dimensions. Jointing should be executed strictly following the manufacturer's guidelines. After the prescribed curing period, loads are applied at approximately 50 kg per minute until failure, with rupture loads recorded within ±1.5% accuracy to ensure consistent and standardized joint strength assessment.

Jointing must be carried out precisely according to the manufacturer's recommended method, including any specific procedures for cold climates. Mortar curing should also follow the manufacturer's directions, with specimens kept undisturbed between jointing and testing. Testing commences only after the manufacturer's recommended curing duration. The applied load should be increased steadily at around 50 kg per minute until the joint fails, ensuring reliable and reproducible results.

Curing must comply with the mortar manufacturer's instructions, and specimens should remain stationary between jointing and testing to avoid disruption. Testing is to commence only after the prescribed curing period has elapsed. Maintaining specimen temperature near ambient and ensuring a minimum moisture content of 10% by weight are critical. The load during testing should be applied at a rate of approximately 50 kg per minute until rupture to guarantee consistent evaluation.

Load is applied linearly along the centerline of the central specimen element, parallel to the joints. A 12 mm thick porous fibre board is used between the loading apparatus and specimen to ensure uniform pressure distribution. The load is distributed over a 500 mm length and a width calculated as the element width minus twice its thickness, but never less than 100 mm. Loading rate is approximately 50 kg per minute until rupture, with load measurements accurate within ±1.5%. Joint strength is then calculated in kg per meter.

The test report must document the location, date, and sampling method of specimens; specifications and designations of the elements tested; identification of the joint design; a detailed description of the jointing method used; curing rates during wet erection; individual joint strength values for each specimen; and the mean joint strength for the test series. Additionally, details of the loading setup, including dimensions of the load spreader and porous fibre board, as well as any clearances between elements, should be included to ensure traceability and reproducibility.