To obtain an aggregate mitigated in environmental burden due to the alkaline metal ingredients included therein.

This aggregate is such one as to be 6.0-8.5 in neutrality (pH) determined by the test method A described below: [Test method A] 200 g of an object is put into a polypropylene vessel, 200 g of ion-exchanged water is then added to the object in the vessel so as to entirely immerse the object; the system is left at rest at 20°C for 20 min; thereafter the pH of the water in the vessel is measured; the measurement pH value is defined as the neutrality of the object.