Concrete Mixes

(1)  For pre-mixed concrete and for the site-batched concrete mixes described in Table 9.3.1.7., the maximum ratio of water to cementing materials measured by weight shall not exceed,

    (a)   0.45 for garage floors, carport floors and all exterior flatwork,

    (b)   0.65 for interior floors other than those for garages and carports, and

    (c)   0.70 for all other applications.

    (2)  The size of aggregate in unreinforced site-batched concrete mixes referred to in Sentence (1) shall not exceed,

    (a)   1/5 the distance between the sides of vertical forms, or

    (b)   1/3 the thickness of flatwork.

Article 9.3.1.7 Ontario Regulation 332/12 Building Code,   Information published by oncodes.ca for educational purposes only.