CONCRETE ADMIXTURE, CEMENT COMPOUND AND SELF HEALING SMART CONCRETE USING THE SAME

摘要

PURPOSE: A concrete admixture having self-healing property is provided to include water-soluble inorganic system gelling agents, alkali sulfate, sodium aluminate and water-soluble silica and produce self-healing hydrate by reacting to water and carbon dioxide without using expensive expansion material and carbonation agents. CONSTITUTION: A concrete mineral admixture having self-healing property comprises 5-25 weight% of water-soluble inorganic system gelling agents, 5-45 weight% of alkali sulfate, 5-25 weight% of sodium aluminate and 25-85 weight% of water-soluble silica. The water-soluble inorganic system gelling agents is at least one among Al2(SO4)3 and AlK(SO4)2. The alkali sulfate comprises 35-70 weight% of at least one among CaSO4, CaSO42H2O and CaSO41/2H2O and 30-65 weight% of at least one among Na2SO4 and K2SO4. The Na2O content of the sodium aluminate is more than 35 weight%, and the apparent density of the sodium aluminate is 0.4-0.7 g/cm^3. The water-soluble silica is at least one among silica fume and reactive silica powder. A cement mixture comprises 1-10 weight% of the concrete admixture having self-healing property and 90-99 weight% of cement. Self-healing smart concrete uses the cement mixture as binding material. [Reference numerals] (AA) 14 days; (BB) 28 days; (CC) Comparative example 1; (DD) Example 1