Activator admixture for cement reduction in concrete compositions

An activator admixture for producing concrete, the activator admixture comprising a pozzolan component,

• wherein the pozzolan component comprises a first pozzolan portion and at least a second pozzolan portion, wherein the first and second pozzolan portions comprise different median particle sizes and chemical compositions;
• wherein the pozzolan component comprises a chemical composition comprising 20-80% w/w silicon dioxide, and 5-40% w/w aluminium oxide;
• and
• wherein the activator admixture further comprises a plasticiser present at between about 8% and 40% w/w of the activator admixture.

A method of producing an activator admixture composition comprising:

• obtaining a first pozzolan portion with a first chemical composition and a first median particle size and a second pozzolan portion with a second chemical composition and a second median particle size;
• combining the first pozzolan portion with the second pozzolan portion to form a pozzolan component;
• and
• mixing the pozzolan component with a plasticiser to produce an activator admixture composition,
• wherein the pozzolan component comprises a chemical composition comprising 20-80% w/w silicon dioxide, and 5-40% aluminium oxide,
• wherein the plasticiser comprises 8-40% w/w of the activator admixture composition, and
• wherein the first and second pozzolan portions comprise different median particle sizes.

A concrete composition comprising:

• an activator admixture comprising a pozzolan component, wherein the pozzolan component comprises a first pozzolan portion and at least a second pozzolan portion, wherein the first and second pozzolan portions comprise different median particle sizes and chemical compositions, wherein the pozzolan component comprises a chemical composition comprising 20-80% w/w silicon dioxide, and 5-40% w/w aluminium oxide, and wherein the activator admixture further comprises a plasticiser present at between about 8% and 40% w/w of the activator admixture;
• a cementitious material;
• and
• an aggregate.