Since the concrete patch is usually designed with the help of the hygroscopic material so it has the feature of absorbing the moisture from all of the areas surrounding it and thus there will be less amount of humidity. With the presence of the moisture on the concrete surface, there is a process that usually occurs called hydration. In case, if you have got the cement that is not used for three months then you must perform a test on it so that you must be aware of its strength and if it is perfect according to the requirement, then only you can use it on YouTube House or building.