Lime-based cement extender compositions, and associated systems and methods
A lime-based cement extender composition, and associated systems and methods are disclosed herein. In some embodiments, the lime-based cement extender composition includes 5-20% by weight lime particles, 40-50% by weight limestone particles, and 40-50% by weight pozzolan particles. Additionally or alternatively, the lime-based cement extender composition can comprise a calcium oxide concentration of 45-65%, a magnesium oxide concentration of 0.5-2%, an iron oxide concentration of 0.5-2.0%, an aluminum oxide concentration of 2-8%, a silicon dioxide concentration of 20-40%, a potassium oxide concentration of 20,000-30,000 ppm, and a sodium oxide concentration of 10,000-20,000 ppm. In some embodiments, the lime-based cement extender composition, or product, is combined with cement to produce a cement blend for use in the mining industry as mine backfill.
1. A lime-based cement extender composition, comprising:
lime particles comprising calcium hydroxide and/or calcium oxide and at least 10% by weight of the composition;
limestone particles comprising calcium carbonate and at least 20% by weight of the composition; and
pozzolan particles comprising silicon dioxide and/or aluminum dioxide and at least 35% by weight of the composition,
wherein at least 90% of the lime particles, limestone particles, and pozzolan particles are less than 75 microns.
2. The composition of claim 1 , wherein:
the lime particles comprise 10-20% by weight of the composition,
the limestone particles comprise 40-50% by weight of the composition, and
the pozzolan particles comprise 30-50% by weight of the composition.
3. The composition of claim 1 , wherein the composition comprises:
a calcium oxide concentration of 45-65%;
a magnesium oxide concentration of 0.5-2%;
an iron oxide concentration of 0.5-2.0%;
an aluminum oxide concentration of 2-8%;
a silicon dioxide concentration of 20-40%;
a potassium oxide concentration of 20,000-30,000 ppm; and
a sodium oxide concentration of 10,000-20,000 ppm.
4. The composition of claim 1 , wherein the lime particles comprise a calcium concentration of at least 85% by weight.
5. The composition of claim 1 , wherein the lime particles comprise at least one of quicklime, hydrated lime, or dolomitic lime.
6. The composition of claim 1 , wherein the limestone particles comprise (i) high-calcium limestone, precipitated calcium carbonate, argillaceous limestone or dolomitic lime and (ii) a calcium concentration of at least 85% by weight.
7. The composition of claim 1 , wherein the pozzolan particles comprise (i) at least 50,000 ppm potassium dioxide, and (ii) at least 30,000 ppm sodium dioxide.
8. The composition of claim 1 , wherein the pozzolan particles comprise volcanic ash or zeolite.
9. The composition of claim 1 , wherein the pozzolan particles comprise calcined clay, silicate, aluminate, silica fume, or pozzolan slag.
10. The composition of claim 1 , wherein at least 99% of the lime particles, limestone particles, and pozzolan particles are less than 75 microns.
11. The composition of claim 1 , wherein the composition does not include fly ash.