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Mishneh Torah 15:7
A man should not marry a barren women, an elderly woman, an aylonit or a minor who is not fit to bear a child unless he has already fulfilled the mitzvah of being fruitful and multiplying, or he has another wife with whom he can father children.
When a man has married a woman and remained married to her for ten years without her bearing children, he must divorce her and pay her [the money due her by virtue of her] ketubah, or marry a woman who is fit to bear children.
If he does not desire to divorce her, he should be compelled to do so; he should be beaten with a rod until he divorces her. Even when he says, “I will not engage in marital relations with her. Instead, we will dwell together with witnesses so that we will not ever be in private,” regardless of whether it is he or she who offers this proposition, it is not accepted. Rather, he is required to divorce [his wife] or marry another woman who is fit to bear children.
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The Ramah (Even HaEzer 1:3) states that in his time, it was no longer customary to compel a man to divorce a woman who has not borne children to her husband. (See also the Hagahot Maimoniot, which quote opinions that state that in this age, and particularly in the diaspora, there is no obligation to divorce a woman even though she has not borne children in this amount of time. At present, there are many Rabbis who have divorced their wives in such a situation, but at least an equal number who have not. Every person has the prerogative of making his own decision regarding this matter.)