Low-hydration-heat ultra-high-performance mass concrete and preparation method thereof

The invention discloses a low hydration heat ultra-high performance mass concrete, which is prepared from the following components in parts by weight: 640 to 750 parts of cement, 90 to 110 parts of low-quality silica fume, 105 to 150 parts of superfine mineral powder, 75 to 106 parts of fly ash microbeads, 900 parts of AlN-silicon-aluminum microporous aggregate, 204 to 234 parts of water and 8.5 to 12.8 parts of polycarboxylic acid water reducing agent. The low-melting-point fiber modified steel fiber accounts for 2-3% of the volume of the mass concrete; wherein the AlN-silicon-aluminum microporous aggregate is obtained by taking kaolin, low-quality silica fume, alpha-Al2O3 micro powder and AlN-waste rubber powder base powder as main raw materials, adding water, mixing, forming, calcining, crushing and screening. While the hydration heat of the ultra-high-performance mass concrete is effectively reduced, the mechanical property of the ultra-high-performance mass concrete can be greatly improved, the shrinkage