Medium-heat anti-cracking portland cement

A technology of portland cement and cement, which is applied in the field of cement, can solve problems such as concrete cracking, and achieve the effects of increasing cement toughness, flexural strength, and volume stability
CN103145358AInactive Publication Date: 2013-06-12CHINA THREE GORGES CORPORATION
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA THREE GORGES CORPORATION
Publication Date
2013-06-12
Estimated Expiration
Not applicable Β· inactive patent
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Abstract

The invention discloses low-heat anti-cracking Portland cement. The cement clinker of the cement consists of the following minerals in percentage by weight: 35 to 55 percent of tricalcium silicate, 15 to 35 percent of dicalcium silicate, 1 to 4 percent of tricalcium aluminate, 15 to 30 percent of tetra calcium aluminoferrite, and 0.1 to 0.8 percent of free calcium oxide, wherein the content of magnesium oxide in the cement is between 3.5 percent and 5.0 percent, the content of alkali is not more than 0.55 percent, and the content of sulfur trioxide is not more than 3.5 percent. The cement has the main technical indexes that the ignition loss is less than or equal to 3wt%, the specific area is less than or equal to 320m<2> / kg, the stability is qualified, 3-day tensile strength is not required, the 7-day tensile strength is more than or equal to 22MPa, the 28-day tensile strength is between 42.5MPa and 52.5MPa, the 3-day breaking strength is not required, the 7-day breaking strength is more than or equal to 3.5MPa, the 28-day breaking strength is more than or equal to 7.5MPa, the 3-day hydration heat is less than or equal to 241KJ / kg, and the 7-day tensile strength is less than or equal to 283KJ / kg. The cement can be used for remarkably improving the cracking resistance of hydraulic concrete.
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Description

technical field

[0001] The invention relates to a cement, in particular to a medium-heat crack-resistant Portland cement used for hydraulic concrete. Background technique

[0002] In recent years, the speed of dam construction in my country has been accelerating, but the problem of concrete cracking has not been well resolved. As far as materials are concerned, cement is one of the most critical factors affecting concrete cracking.

[0003] Hydraulic concrete (except concrete for flood discharge and energy dissipation buildings) has the characteristics of large volume, long design age, and generally low strength. It has high requirements for concrete crack resistance and durability. Therefore, cement is required to have low and slow heat of hydration. 1. It has a certain function of compensating for shrinkage. In special cases, it should also have the effect of preventing alkali aggregate reaction and sulfate erosion. Contents of the invention

[0004] In order to solve t...

Claims

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