Post by somratislam2 on Feb 15, 2024 5:24:38 GMT -6
The adhesion measurement is carried out on specimens matured under different conditions that aim to reproduce the environmental conditions to which the adhesive may be subjected during the maturation process. Three standards have been approved that include test methods for the three types of adhesives: UNE-EN 1348 for cementitious adhesives C Initial adhesion It consists of keeping the specimens for 28 days in laboratory conditions, and aims to reproduce a normal hydration process, measuring adhesion based on the degree of hydration of the cement and the hardening/cohesion of the polymer resin.
In fast-setting cementitious adhesives (F), the tensile strength test is carried out after a maximum of 24 hours. Adhesion after immersion in water It consists of keeping the specimens for 7 days in laboratory conditions and 20 days in water immersion , and allows knowing the behavior of the polymer resin in dispersion and the final result of the adhesion for a situation of maximum hydration of the Finland Email List cement. Adhesion after heat aging It consists of keeping the specimens for 14 days in laboratory conditions and 14 days in an oven at 70 ºC , and reproduces a very unfavorable process for cement hydration . Only the action of the resin will prevent this hydration from being insufficient, at the same time evaluating the behavior of the polymer resin.
Adhesion after freeze/thaw cycles It consists of keeping the specimens for 7 days in laboratory conditions, 21 days of immersion in water and 25 freeze/thaw cycles (between –15º and 15 ºC). Evaluate porosity and pore size after a fairly complete hydration process. ANFAPA UNE-EN 1324 for adhesives in dispersion D Initial adhesion Evaluates the behavior of the adhesive in a resin hardening process under laboratory conditions for 14 days , by evaporation of water and/or solvent. Adhesion after heat aging It consists of keeping the specimens for 14 days in laboratory conditions and 14 days at 70 ºC , and evaluates the behavior of the resin at that temperature. The standard also contemplates the additional characteristics of D–2 dispersion adhesives. High temperature adhesion It means maintaining adhesion at 70 ºC, without the cooling for 24 hours that is contemplated in the fundamental characteristic.
In fast-setting cementitious adhesives (F), the tensile strength test is carried out after a maximum of 24 hours. Adhesion after immersion in water It consists of keeping the specimens for 7 days in laboratory conditions and 20 days in water immersion , and allows knowing the behavior of the polymer resin in dispersion and the final result of the adhesion for a situation of maximum hydration of the Finland Email List cement. Adhesion after heat aging It consists of keeping the specimens for 14 days in laboratory conditions and 14 days in an oven at 70 ºC , and reproduces a very unfavorable process for cement hydration . Only the action of the resin will prevent this hydration from being insufficient, at the same time evaluating the behavior of the polymer resin.
Adhesion after freeze/thaw cycles It consists of keeping the specimens for 7 days in laboratory conditions, 21 days of immersion in water and 25 freeze/thaw cycles (between –15º and 15 ºC). Evaluate porosity and pore size after a fairly complete hydration process. ANFAPA UNE-EN 1324 for adhesives in dispersion D Initial adhesion Evaluates the behavior of the adhesive in a resin hardening process under laboratory conditions for 14 days , by evaporation of water and/or solvent. Adhesion after heat aging It consists of keeping the specimens for 14 days in laboratory conditions and 14 days at 70 ºC , and evaluates the behavior of the resin at that temperature. The standard also contemplates the additional characteristics of D–2 dispersion adhesives. High temperature adhesion It means maintaining adhesion at 70 ºC, without the cooling for 24 hours that is contemplated in the fundamental characteristic.