Color-adjustable repairing agent and preparation method therefor, and concrete containing repairing agent
A color-adjustable repairing agent and a preparation method therefor, and concrete containing the repairing agent are disclosed in the present invention; the repairing agent is a mixture of microbial powder, dopamine and a calcium source immobilized by cement; and according to total mass of the mixture, a mass percentage of the microbial powder is 44%-54%, a mass percentage of the dopamine is 1%-5%, and a mass percentage of the calcium source is 44%-54%; according to the present invention, dopamine is mixed into a microbial self-repairing agent, a cement-immobilized microbial self-repairing agent is used for preparing repairing agent particles, a crack area of microbial self-repairing concrete is repaired, and repairing performance of the concrete and a color of a repairing product of the crack area are tested.
1 . A preparation method for a color-adjustable repairing agent, comprising the following steps:
(1) mixing microbial powder, dopamine and a calcium source, and performing uniform stirring to obtain mixed powder for later use;
(2) taking an effective amount of an adhesive substance, spraying distilled water on a surface of the adhesive substance, and pouring the adhesive substance into a sugarcoating machine; and spraying the mixed powder prepared in the step (1) and water mist into the sugarcoating machine in batches for powder-coating granulation, and sieving particles after granulation; and
(3) pouring the sieved particles into the sugarcoating machine again, spraying cement powder and water mist into the sugarcoating machine in batches for powder-coating granulation, and performing sieving to obtain repairing agent particles after granulation.
2 . The preparation method for the color-adjustable repairing agent according to claim 1 , wherein in the step (1), a mass ratio of the microbial powder to the dopamine to the calcium source is 10-45:10-45:1.
3 . The preparation method for the color-adjustable repairing agent according to claim 1 , wherein in the step (2), the adhesive substance is sucrose particles.
4 . The preparation method for the color-adjustable repairing agent according to claim 1 , wherein in the step (2), a particle size after sieving is 1.75 mm-2.36 mm; and in the step (3), a particle size after sieving is 3.5 mm-4.0 mm.
5 . The preparation method for the color-adjustable repairing agent according to claim 1 , wherein after the step (3), the preparation method further comprises curing the repairing agent particles, wherein a curing process comprises: making the repairing agent particles stand for 45 h-50 h in a ventilation environment with a constant temperature of 20° C.-30° C., and spraying water mist on a surface of the repairing agent every 6 h-8 h, to keep the surface wet.
6 . The preparation method for the color-adjustable repairing agent according to claim 1 , wherein the color-adjustable repairing agent comprises 44%-54% of the microbial powder, 1%-5%, of the dopamine and 44%-54% of the calcium source by weight.
7 . The preparation method for the color-adjustable repairing agent according to claim 1 , wherein the cement powder comprises sulphoaluminate cement or portland cement.
8 . The preparation method for the color-adjustable repairing agent according to claim 6 , wherein the microbial powder is Bacillus mucilaginosus or Bacillus alkalophilus.
9 . The preparation method for the color-adjustable repairing agent according to claim 6 , wherein the calcium source comprises one or more types of solid powder of calcium formate, calcium chloride and calcium phosphate.