Compound sulfate cement

A composite sulfate and cement technology, applied in the field of building materials, can solve the problems of easy cracking, unfavorable environmental protection and resource recycling, and high heat generation, and achieve excellent product performance, remarkable effects of energy saving, emission reduction and consumption reduction. good permeability effect

Inactive Publication Date: 2010-11-17
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a low-carbon building material with significant energy-saving, consumption-reducing and emission-reducing effects, which can overcome the defects of high hydration heat, easy cracking, disadvantages of environmental protection and resource recycling of traditional Portland cement series. sulfate cement

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0023] Grind the slag and fluorine gypsum separately until the specific surface area is 450m 2 / kg, 300m 2 / kg, mixed with P.O42.5 cement and first-grade fly ash evenly according to the ratio in Table 1, and carried out the mortar test according to the GB175-2008 standard, and measured the resistance of the specimens after standard curing for 3d, 7d, and 28d respectively. compressive and flexural strength.

[0024]

Embodiment 2

[0026] Grind the slag, coal gangue and fluorogypsum separately until the specific surface area is 450m 2 / kg, 350m 2 / kg, 300m 2 / kg, mix with P.O42.5 cement according to the ratio in Table 2, and carry out the mortar test according to the GB175-2008 standard, and measure the compressive and flexural strength of the standard culture specimens after 3d, 7d, and 28d.

[0027]

Embodiment 3

[0029] Grind the slag, slag and fluorogypsum separately until the specific surface area is 450m 2 / kg, 350m 2 / kg, 300m 2 / kg, according to the ratio in Table 3 and P.O42.5 cement and mixed evenly, according to the GB175-2008 standard to carry out the mortar test, and measure the compressive and flexural strength of the standard maintenance specimens for 3d, 7d, and 28d.

[0030]

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Abstract

The invention provides compound sulfate cement which is characterized in that slag, plaster, aluminosilicate waste residues and cement clinker are taken as basic materials, and one kind of or various kinds of lime, limestone, alunite and zeolite are taken as auxiliary materials. The compound sulfate cement comprises the following components in parts by weight: 40 to 80 parts of slag, 5 to 20 parts of plaster, 10 to 30 parts of aluminosilicate waste residues, 3 to 8 parts of cement linker and 0 to 10 parts of auxiliary materials. The invention has the characteristics of high strength, low heat and no shrinkage or micro-expansion and is specifically suitable for the construction of mass concrete, such as large dams, cushion caps, concrete road surfaces, marine engineering, and the like. The cement has no dissociative calcium hydroxide, has excellent sulfate corrosion resistance performance, can fundamentally solve alkali-aggregate reaction due to extremely lower alkalinity, has important meaning for the durability of the construction of highway and railway across saline and alkaline land, and has good impermeability, and the strength and the impermeability of the cement in seawater can be continuously enhanced. Moreover, the corrosion of steel bars can be effectively resisted due to Fridel salt formed by the reaction of aluminum oxide in the slag and chloride ions.

Description

technical field [0001] The invention relates to a composite sulfate cement, which belongs to the technical field of building materials. Background technique [0002] The current general-purpose Portland cement is evolved from the Portland cement invented in 1824. It is made of limestone, clay and other raw materials, designed with appropriate ratio and composition, and processed through the "two grinding and one burning" process. Currently the largest hydraulic cementitious material. [0003] In the past 200 years, the chemical composition and mineral composition of Portland cement have basically remained unchanged, and the technological progress of the cement industry is mainly reflected in the production process. [0004] For a long time, Portland cement has been widely used for its stable performance and mature production process, but at the same time, some of its shortcomings have seriously affected the quality of the project, such as Portland cement will expand with he...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B11/30
CPCC04B2111/34C04B28/14Y02W30/91C04B7/00C04B14/047C04B14/28C04B14/36C04B18/08C04B18/12C04B18/141C04B22/064
Inventor 牛全林
Owner SHANDONG UNIV OF TECH
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