Concrete product containing a mixture of
A cement paste containing microbial cells which has a sustained effect and an excellent function of purifying water. This cement paste contains a mixture of Bacillus subtilis, Bacillus thuringiensis and Bacillus sphaericus cells at a mixing ratio by mass of 0.1 to 50:0.1 to 50:0.1 to 50.
1. A concrete product prepared by mixing a cement paste containing microbial cells comprising Bacillus subtilis, Bacillus thuringiensis and Bacillus sphaericus , in a ratio by mass respectively of 0.1 to 50:0.1 to 50:0.1 to 50, with crushed natural stones and water, and then shaping, curing and hardening the mixture.
2. The concrete product of claim 1 wherein said crushed natural stones have a diameter of 2.5 to 10 mm.
3. The concrete product of claim 1 wherein said crushed natural stones in the range of 1500 to 1950 kg are mixed with said cement paste in the range of 250 to 300 kg.