Cement composition curable at low temperatures
First Claim
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1. A blended hydraulic cement composition, capable of curing at temperatures below freezing, consisting essentially of:
- From 50 parts to about 80 parts portland cementFrom 13 parts to about 35 parts fly ashFrom 0 parts to about 10 parts metakaolinFrom 0 parts to about 6 parts slagFrom 0 parts to 4 parts admixture, wherein said admixture is a set regulating additive,From 1 part to about 5 parts potassium carbonate, wherein the parts of potassium carbonate plus one-half of the parts of metakaolin is equal to at least 2.
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Abstract
A blended hydraulic cement composition, curable at low temperatures, including temperatures below the freezing point of water, is composed of portland cement, slag, pozzolans including metakaolin, and admixtures including potassium carbonate and water reducing compositions. The cement is particularly useful in producing concrete compositions which achieve high strength in a brief period of time, and continue curing at ambient temperatures, and temperatures below the freezing point of water.
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Citations
16 Claims
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1. A blended hydraulic cement composition, capable of curing at temperatures below freezing, consisting essentially of:
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From 50 parts to about 80 parts portland cement From 13 parts to about 35 parts fly ash From 0 parts to about 10 parts metakaolin From 0 parts to about 6 parts slag From 0 parts to 4 parts admixture, wherein said admixture is a set regulating additive, From 1 part to about 5 parts potassium carbonate, wherein the parts of potassium carbonate plus one-half of the parts of metakaolin is equal to at least 2. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A blended hydraulic cement composition, capable of curing at temperatures below freezing, consisting essentially of:
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From 50 parts to about 80 parts portland cement From 13 parts to about 35 parts fly ash From 0 parts to about 10 parts metakaolin From 0 parts to about 6 parts slag From 0 parts to 4 parts admixture, wherein said admixture is a set regulating additive, From 1 part to about 5 parts sodium carbonate, wherein the parts of sodium carbonate plus one-half of the parts of metakaolin is equal to at least 2. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification
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Current AssigneeLone Star Industries, Inc. (Pennsylvania) (Buzzi Unicem SPA)
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Original AssigneePyrament Incorporated
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InventorsGravitt, Billy B., Heitzmann, Richard F., Sawyer, James L.
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Primary Examiner(s)Dixon, Jr., William R.
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Assistant Examiner(s)Brunsman, David M.
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Application NumberUS07/103,755Time in Patent Office634 DaysField of Search106/89, 106/97, 106/DIG. 1, 106/315US Class Current106/706CPC Class CodesC04B 14/106 KaolinC04B 18/08 Flue dust , i.e. fly ashC04B 18/141 SlagsC04B 2103/20 RetardersC04B 2103/302 Water reducersC04B 2111/76 Use at unusual temperatures...C04B 22/062 of the alkali or alkaline-e...C04B 22/10 containing carbon in the anionC04B 24/06 containing hydroxy groupsC04B 24/26 obtained by reactions only ...C04B 28/04 Portland cementsY02W 30/91 Use of waste materials as f...Y10S 106/01 Fly ash
