Optimisation in the use of commercial adhesive for the fixation of the stone

In the last years the Technological Centre of the Granite, studied by means of a project of investigation the adherencia between adhesive and commercial mortars with the natural stone, joined to different types of supports used frequently for facades.

For the achievement of the aims proposed, carried out, in the laboratories of the Centre, an Experimental Plan of essays of unions hit in natural stone of granitic type. They effected more than 150 essays of samples of granite combined with other materials like brick or concrete.

The variables considered in the experimental plan have been: utilisation of three types of adhesive; application of adhesive on two types of unions: stone-brick and stone-concrete; employment of two models of essay: flexion under load concentrated and flexo-traction. With the object to obtain representative values, have prepared  10 samples of essay by each typology. They have used tests of contrast or of reference of the models tested.

In accordance with the exposed previously, formulate  the following technical conclusions:

• The results show that the unions realised with stone-brick comport slightly better in front of the efforts of flexion, while the unions stone-concrete comport better before the efforts of flexo-traction.


• The essays realised of flexion reflect a greater capacity of load, and therefore of adhesion, of the mortar tail Weber Cabbage. Flex., that surpasses to the others two types of adhesive, speaking in terms of supported half load.


• Regarding the essay of flexo-traction, the mortar tail Weber Cabbage. Flex. It reflects also a greater capacity of load, surpassing to the others two types of adhesive, speaking in terms of supported half load.


• The cycles of humidity and dried realised to all the types of unions tested, have not produced any type of physical alteration to any of the tests.


• In relation to the results of cycles of humidity/dried, would be pertinent to realise proofs of thermal crash and heladicity to the unions, to evaluate his behaviour in conditions of brusque changes of temperature or zones of frosts, respectively.  

In relation to the results of cycles of humectación/dried, would be pertinent to realise proofs of thermal crash and frost resistance to the unions, to evaluate his behaviour in conditions of brusque changes of temperature or zones of frosts, respectively.