Modification of properties of pozzolanic materials through blending

A technology of volcanic ash and characteristics, applied in the field of volcanic ash, can solve problems such as slow response and hindering strength

Pending Publication Date: 2018-04-17
ROMAN CEMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a limit to how much Portland cement can be replaced with pozzolans because they are slower to react and generally hinder the development of strength

Method used

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  • Modification of properties of pozzolanic materials through blending
  • Modification of properties of pozzolanic materials through blending
  • Modification of properties of pozzolanic materials through blending

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0134] Examples 1-4 illustrate the effect of particle size optimizing a 70:30 mixture of Portland cement and fly ash. The Portland cement used in each of Examples 1-4 was an approximate Type II cement made by more finely grinding Type V cement. Example 1 is a particle size optimized 70:30 cement / pozzolan mix. It uses a graded Portland cement designated "Cement #11" by passing an approximate Type II Portland cement through a miniature air classifier manufactured by Progressive Industries, Sylacauga, Alabama, and Obtained by collecting fine particles. Example 1 also uses a classed fly ash classified as "fly ash 8z1", which is obtained by passing class F fly ash through an air classifier twice, first removing most of the fines below about 10 μm and then about Most of the fine particles above 50μm. The air classifier was a model CFS 8HDS from Netzsch-Condux Mahltechnik GmbH, Hanau, Germany. Examples 2 and 3 are both 70:30 control mixes of Portland cement and fly ash using uncl...

Embodiment 5-14

[0145] Other mortar compositions (ie 60:40 mix and 70:30 mix) were made using cement #11 and fly ash 8z1. Additionally, a mortar composition was made using another graded cementitious material identified as "Cement #13" and another graded fly ash identified as "Fly Ash 7G". Cement #13 was graded in the same facility as cement #11. The particle size distributions of cement #11, cement #13, and control cement were determined at a grading facility using a Beckman Coulter LS 13 320 X-ray Diffraction Analyzer and are listed in Table 3 below.

[0146] table 3

[0147]

[0148]

[0149] Fly ash 7G was classified at the same facility as fly ash 8z1 (Netzsch-Condux Mahltechnik GmbH), but only once to remove fine particles. No secondary classification was performed to remove coarse particles. The particle size distribution of fly ash 7G was determined using a Cilas 1064 particle size analyzer and is listed in Table 4 below. The PSD of the control fly ash is included for comp...

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Abstract

The invention provides methods for producing a blended pozzolan having one or more characteristics, such as one or more chemical and / or physical characteristic, in an established amount or range fromtwo or more different pozzolans. Two or more pozzolans having different chemical and / or physical characteristics can be blended together and a chemical analyzer used to determine a chemical and / or physical characteristic of the blended pozzolan. Upon determining that the chemical and / or physical characteristic of the blended pozzolan is outside the established amount or range, modifying a blendingratio of the two or more pozzolans to restore the chemical and / or physical characteristic to the established amount or range.

Description

technical field [0001] The invention is generally in the field of pozzolans used to supplement hydraulic cement to make concrete. Background technique [0002] In modern concrete, pozzolans such as coal ash, biomass ash, pozzolan, pumice, natural pozzolan, metallurgical slag, metakaolin, calcined clay and silica fume are often used to replace part of Portland cement (Portland cement). Replacing a portion of Portland cement with pozzolan results in an improved cement with higher durability, lower chloride ion permeability, reduced creep, increased resistance to chemical attack, lower cost and reduced environmental impact concrete. Pozzolans include amorphous silica that can react with excess calcium hydroxide released during hydration of Portland cement. However, there is a limit to how much Portland cement can be replaced with pozzolans because they are slower to react and generally hinder the development of strength. Contents of the invention [0003] Disclosed herein ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B20/02
CPCC04B40/0032C04B40/0039Y02W30/91Y02P40/10C04B2103/0088C04B7/12C04B18/06C04B18/08C04B18/10C04B18/141C04B18/142C04B18/146C04B28/04C04B40/0042
Inventor 约翰·M·桂恩安德鲁·S·汉森
Owner ROMAN CEMENT
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