Pray tell, ladies and gentlement, exactly why are you concerned about foreign ownership of Australian infrastructure?
What exactly do you think the foreign owners are going to do? Put the infrastructure in their back pockets and take it home with them?
What difference does it make if China invests in Australia as against the UK or the US or Japan? All three of the latter group were welcomed with open arms (for the most part, people took some time to get used to Japanese investment). What makes China such a devil? Is it because, well, they are Chinese?
The Australian Government retains control of all foreign investments through laws and regulation. No, they can't take the investments home to China. No, they cannot bring in cheap Chinese labourers. No, they cannot charge excessively high prices for their use of their infrastructure. The Australian Government furthermore, can always take repossession of the goods/services they have invested in if they feel the Chinese or other foreign investors are doing naughty things. All they need do is pass legislation enabling them to take control again. Of course, they'd have to pay compensation to the investors, for their loss of their investment but that is a minor detail.
Australia will always control it's own infrastructure, it's own territory, it's own services. All your worries appear to be based on what? The Yellow Peril? Oh, dearie, dearie, me. Tut, tut.
Nationalism is not to be confused with patriotism. - Eric Blair