can anyone tell me if concrete is widely used in Bali, or are buildings usually made from another material?
Concrete is used extensively. Far far more than in australia and north america. Reinforced concrete, unlike in north america and australia, forms the main structure in the large majority of residential construction in Bali, plus of course being used in commercial structures. Steel, for the reinforcing of the concrete, and the ReadyMix itself are two of the larger cost components of the building - pre-fabricated finishing materials aside. The structure of most buidings is based on a concrete footing / foundation, with concrete columns - all load bearing structures are typically concrete. The wall 'fills' use red brick.
As to whether you're allowed to volunteer with your social visa - that has been the topic of much debate here. I personally think you'll have no problem - even though you may not be allowed to, and if you do encounter a problem, a small payoff for someone to turn a blind eye would usually do the trick.
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