Low-heat anti-cracking portland cement
A portland cement and low-heat technology, applied in the cement field, can solve problems such as concrete cracking, and achieve the effects of increasing cement toughness, flexural strength, and volume stability
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Embodiment 1
[0018] A low-heat crack-resistant Portland cement, the mineral composition of the cement clinker is: dicalcium silicate: 45.5%, tricalcium silicate: 30.4%, tricalcium aluminate: 3.2%, tetracalcium aluminoferrite: 20.4%, free calcium oxide: 0.5%; the content of magnesium oxide in the cement is 4.2%, the content of alkali is 0.52%, and the content of sulfur trioxide is 3.2%, and the above percentages are percentages by weight.
[0019] The various technical indicators of the low-heat crack-resistant Portland cement are: loss on ignition: 2wt%, specific surface area: 320m 2 / kg, initial setting time: 90min, final setting time: 10h, stability: qualified, no requirement for 3-day compressive strength, 7-day compressive strength: 15.0MPa, 28-day compressive strength: 47.0MPa, 3 There is no requirement for the flexural strength of one day, the flexural strength of 7 days: 4.0MPa, the flexural strength of 28 days: 8.0MPa, the heat of hydration of 3 days: 200KJ / kg, the compressive stre...
Embodiment 2
[0022] A low-heat crack-resistant Portland cement, the mineral composition of the cement clinker is: dicalcium silicate: 70%, tricalcium silicate: 10%, tricalcium aluminate: 1%, tetracalcium aluminoferrite: 30%, free calcium oxide: 0.1%; the magnesium oxide content in the cement is 3.5%, the alkali content: 0.1%, the sulfur trioxide content: 1%, and the above percentages are percentages by weight.
[0023] The technical indicators of the low-heat crack-resistant Portland cement are: loss on ignition: 3wt%, specific surface area ≤ 300m 2 / kg, initial setting time: 60min, final setting time: 12h, stability: qualified, no requirement for 3-day compressive strength, 7-day compressive strength: 13.0MPa, 28-day compressive strength: 52.5MPa, 3 There is no requirement for the flexural strength of one day, the flexural strength of 7 days: 5MPa, the flexural strength of 28 days: 7.0MPa, the heat of hydration of 3 days: 220KJ / kg, the compressive strength of 7 days: 250KJ / kg.
[0024] W...
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