Settlement substrate of portland cement concrete or lightweight concrete for oyster and preparation method thereof

A preparation method of a Portland cement concrete settlement substrate for oyster, comprising the following steps:

• S1, designing different roughness according to the characteristic that oyster larvae prefer to settle to rough substrate surface, and then manufacturing molding from works with different roughness;
• S2, weighing Portland cement, a mineral admixture, coarse aggregate, sand, water, a dark pigment, biological calcium powder, modified carbonate (or bicarbonate) and a super plasticizer.
• S3, firstly putting the coarse aggregate and the sand into a concrete mixer to be mixed for 0.5-1 min;
• then adding the Portland cement, the mineral admixture, the dark pigment, the biological calcium powder, and the modified carbonate (or bicarbonate), and continuously mixing for 1-2 min;
• then adding the water and the super plasticizer, and mixing for 2-6 min;
• then carrying out casting and consolidating after obtaining desired homogeneity;
• and
• S4, putting a concrete sample after demolding into a high-concentration CO2 curing chamber for curing for 0.5-5 h according to the situation so as to reduce the alkalinity of the concrete sample, and then carrying out standard curing for 28 d or curing according to the actual situation.