The employer shall ensure at a construction site of a building or other construction work that,—
(a) the concrete mixture does not contain any material which may unduly affect the setting of such concrete, weaken such concrete or corrode steel used with such concrete;
(b) when dry ingredients of concrete are being mixed in confined spaces such as silos—
(i) the dust shall be exhausted at the time of such mixing; and
(ii) in case the dust cannot be exhausted as specified in subclause (i), the building workers shall wear respirators at the time of such mixing;
(c) when concrete is being tipped from buckets, building workers are kept out of the range of any kickbacks of such buckets;
and
(d) loads are not dumped or placed on setting concrete so as to avoid damage to green concrete.