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Moderate heat anti-crack type Portland cement

A portland cement and cement technology, which is applied in the field of cement, can solve problems such as concrete cracking, and achieve the effects of increasing cement toughness, improving anti-abrasion performance, and improving volume stability

Inactive Publication Date: 2016-02-10
关勇河
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the cracking problem of concrete in the prior art, the present invention provides a medium-heat crack-resistant Portland cement for hydraulic concrete

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] A medium-heat crack-resistant Portland cement, characterized in that: the mineral composition of the cement clinker is: tricalcium silicate: 20%, dicalcium silicate: 40%, tricalcium aluminate: 7%, iron Tetracalcium aluminate: 5%, free calcium oxide: 1%; the content of magnesium oxide in the cement is 0.5%, the content of alkali does not exceed 0.5%, and the content of sulfur trioxide does not exceed 2.0%, and the above percentages are percentages by weight.

[0011] The technical indicators of the medium-heat crack-resistant Portland cement are: loss on ignition 0.5wt%, specific surface area 80m 2 / kg, initial setting time 120min, final setting time 5h, stability: qualified, no requirement for 3-day compressive strength, 7-day compressive strength 82MPa, 28-day compressive strength: 30MPa, 3-day flexural strength No requirement, 7-day flexural strength: 5.6MPa, 28-day flexural strength: 9.8MPa, 3-day heat of hydration 195KJ / kg, 7-day compressive strength 245KJ / kg.

Embodiment 2

[0013] A medium-heat crack-resistant Portland cement, characterized in that: the mineral composition of the cement clinker is: tricalcium silicate: 25%, dicalcium silicate: 50%, tricalcium aluminate: 9%, iron Tetracalcium aluminate: 7%, free calcium oxide: 5%; the content of magnesium oxide in the cement is 0.8%, the content of alkali does not exceed 0.5%, and the content of sulfur trioxide does not exceed 2.0%, and the above percentages are weight percentages.

[0014] The technical indicators of the medium-heat crack-resistant Portland cement are: loss on ignition 0.8wt%, specific surface area 80m 2 / kg, initial setting time 160min, final setting time 4h, stability: qualified, no requirement for 3-day compressive strength, 7-day compressive strength 90MPa, 28-day compressive strength: 35MPa, 3-day flexural strength No requirement, 7-day flexural strength: 5.6MPa, 28-day flexural strength: 10.2MPa, 3-day heat of hydration 180KJ / kg, 7-day compressive strength 230KJ / kg.

Embodiment 3

[0016] A medium-heat crack-resistant Portland cement, characterized in that: the mineral composition of the cement clinker is: tricalcium silicate: 30%, dicalcium silicate: 60%, tricalcium aluminate: 11%, iron Tetracalcium aluminate: 10%, free calcium oxide: 8%; the content of magnesium oxide in the cement is 1.0%, the content of alkali does not exceed 0.5%, and the content of sulfur trioxide does not exceed 2.0%, and the above percentages are percentages by weight.

[0017] The technical indicators of the medium-heat crack-resistant Portland cement are: loss on ignition 1wt%, specific surface area 100m 2 / kg, initial setting time 120min, final setting time 3h, stability: qualified, no requirement for 3-day compressive strength, 7-day compressive strength 80MPa, 28-day compressive strength: 32MPa, 3-day flexural strength No requirement, 7-day flexural strength: 5.0MPa, 28-day flexural strength: 13MPa, 3-day heat of hydration 150KJ / kg, 7-day compressive strength 205KJ / kg.

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Abstract

The invention discloses moderate heat anti-crack type Portland cement. The moderate heat anti-crack type Portland cement is characterized in that cement clinker of the moderate heat anti-crack type Portland cement comprises the following mineral components in weight percent: 20-30% of tricalcium silicate, 40-60% of dicalcium silicate, 7-11% of tricalcium aluminate, 5-10% of tetra calcium aluminoferrite and 1-8% of free calcium oxide, wherein the content of magnesium oxide in the cement is 0.5-1.0%, the alkali content is not more than 0.5%, the content of sulfur trioxide is not more than 2.0%, and all the percents are weight percents. The moderate heat anti-crack type Portland cement can obviously improve the crack resistance of hydraulic concrete.

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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Application Information

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IPC IPC(8): C04B7/02C04B7/48
Inventor 关勇河
Owner 关勇河
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