Sacrificial concrete for core catcher and preparation method thereof

A sacrificial concrete for a core catcher, comprising raw materials in parts by weight as follows:

• cement, 575˜625 parts;
• a quartz sand, 1200˜1300 parts;
• a hematite ore, 700˜800 parts;
• water, 200˜220 parts;
• a water reducing agent, 7˜10 parts;
• and
• strontium oxide (SrO), 5˜10 parts;
• wherein the water is tap water or drinking water, and the water meets requirements of Chinese “standard of water for concrete” of JGJ63-2006;
• wherein the water reducing agent is a polycarboxylate superplasticizer, an appearance of the polycarboxylate superplasticizer is in a range from colorless to light yellow, a density of the polycarboxylate superplasticizer is in a range of 1.05˜1.15 grams per milliliter (g/ml), a solid content of the polycarboxylate superplasticizer by mass is greater than or equal to 40%, a pH value of the polycarboxylate superplasticizer is 4±2, and a water reducing rate of the polycarboxylate superplasticizer is greater than or equal to 30%;
• wherein a preparation method of the sacrificial concrete comprises:
• step (1), mixing the cement, the quartz sand and the strontium oxide evenly to obtain a mixed material M1;
• step (2), adding the hematite ore into the mixed material M1 and stirring to obtain a uniform mixed material M2;
• and
• step (3), adding a mixed solution of the water and the water reducing agent into the uniform mixed material M2 and stirring to obtain a uniform mixed material M3, and then molding and curing to thereby obtain the sacrificial concrete for a core catcher.