Patent ID: 7938905

Claim:
A method for making concrete parts and structures, comprising: (i) supplying a first concrete composition based on a quick setting and hardening binder containing: 60 to 95% Portland cement; 5 to 40% curing accelerator comprising Al 2 O 3 alumina, lime and sulfate; a retarder; and a superplasticizer polymer selected from the group consisting of polyphosphonate polyox, and polycarboxylate polyox, or mixture thereof,; then (ii) adding a releaser to form a second concrete composition selected from the group consisting of: aqueous suspension containing: (i) at least one calcium aluminate, (ii) from 0.5 to 4% in weight relative to the total weight of the calcium aluminate(s), of a setting inhibitor of the aluminous cements, and (iii) at least one settling-preventing agent; a transition alumina; an alumina hydroxide gel; a mixture thereof; and (iii) pouring this second concrete composition in a concrete form.