Cementitious block material utilizing spent blasting abrasive particles

a technology of abrasive particles and cementitious blocks, applied in the field of cementitious blocks or concrete masonry units, can solve problems such as substantial problems

Active Publication Date: 2008-12-25
U S TECH MEDIA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One of the detrimental characteristics of the typical CMU is the substantial porosity thereof, which allows water to readily be absorbed by the CMU and thereby flow through the CMU.
This of course presents a substantial issue in rainy climates particularly where driving rain is common.

Method used

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  • Cementitious block material utilizing spent blasting abrasive particles
  • Cementitious block material utilizing spent blasting abrasive particles

Examples

Experimental program
Comparison scheme
Effect test

example no.1

EXAMPLE NO. 1

[0024]

Light WeightWeightVolume% TotalCement toCement toMaterial(lbs)(cu. ft.)Volumeaggregate ratio(aggregate + media) ratioCement5005.39.21:8.491:9.85Fine Aggregate2502.54.3Coarse Aggregate8359.817.0Light Weight183032.756.9Media3507.212.5Total376557.599.9ASTM C-90ASTM C-90Net Comp.Ave. Net Comp.Std. Ave.Ave.Std. Ave.Ave. Oven-dryCMUStrengthStrengthNet Comp.AbsorptionAbsorption.AbsorptiondensityNo.(psi)(psi)Strength (psi)(lb / cu. ft.)(lb / cu. ft.)(lb / cu. ft.)(lb / cu. ft.)12579228093298127901900411.5311.5318.095.39

example no.2

EXAMPLE NO. 2

[0025]

Medium WeightWeightVolume% TotalCement toCement toMaterial(lbs)(cu. ft.)Volumeaggregate ratio(aggregate + media) ratioCement5005.39.91:7.751:9.11Fine Aggregate250025.046.6Coarse Aggregate00.00.0Light Weight90016.130.0Media3507.213.4Total425053.699.9ASTM C-90ASTM C-90Net Comp.Ave. Net Comp.Std. Ave.Ave.Std. Ave.Ave. Oven-dryCMUStrengthStrengthNet Comp.AbsorptionAbsorption.AbsorptiondensityNo.(psi)(psi)Strength (psi)(lb / cu. ft.)(lb / cu. ft.)(lb / cu. ft.)(lb / cu. ft.)12772227613273727571900410.5610.5615.0110.81

example no.3

EXAMPLE NO. 3

[0026]

Normal WeightWeightVolume% TotalCement toCement toMaterial(lbs)(cu. ft.)Volumeaggregate ratio(aggregate + media) ratioCement5005.39.61:8.081:9.43Fine Aggregate363536.465.8Coarse Aggregate5456.411.6Light Weight00.00.0Media3507.213.0Total503055.3100.0ASTM C-90ASTM C-90Net Comp.Ave. Net Comp.Std. Ave.Ave.Std. Ave.Ave. Oven-dryCMUStrengthStrengthNet Comp.AbsorptionAbsorption.AbsorptiondensityNo.(psi)(psi)Strength (psi)(lb / cu. ft.)(lb / cu. ft.)(lb / cu. ft.)(lb / cu. ft.)1304022877330402986190049.289.2813.0125.80

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Abstract

An accelerated-curing concrete masonry unit (CMU) mixture includes aggregate material, hydraulic cement and spent blasting abrasive particles, and may also include paint residue particles. The abrasive particles or abrasive and paint particles combined preferably make up at least 5.0% of the mixture by volume. Preferably, the hydraulic cement is Portland cement and the abrasive or combined particles make up about 10.0% to 17.0% of the mixture by volume. The abrasive particles typically have a fineness modulus ranging from 0.6 to 1.5 and more preferably from 0.75 to 1.2. Plastic particles may make up some or all of the abrasive particles. CMUs formed with this mixture are substantially more water repellent than standard CMUs and have a water absorption often no greater than 9.0 pounds per cubic foot. Preferred CMUs have an average net compressive strength of over 2,500 psi while levels of 3,000 psi or 3,500 psi are not uncommon.

Description

BACKGROUND OF THE INVENTION [0001] 1. Technical Field [0002] The invention relates generally to cementitious block or concrete masonry units (CMUs) and a mixture of materials forming the CMU. More particularly, the invention relates to CMU material which provides improved characteristics such as water repellency. Specifically, the invention relates to such a CMU material which includes spent blasting abrasives of a suitable size and a sufficient amount to produce a highly desirable CMU having increased compressive strength and substantially improved water repellency and other characteristics. [0003] 2. Background Information [0004] Concrete masonry units (CMUs) have long been used in the construction industry to provide a relatively inexpensive and strong building unit, especially in comparison to the use of bricks which typically have a higher cost due to the necessity of firing the bricks to fairly high temperatures. While CMUs have been widely used, there is still room to improve...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C04B14/00
CPCC04B18/0481C04B28/04C04B2111/27C04B20/0076C04B18/18Y02W30/91
Inventor WILLIAMS, RAYMOND F.
Owner U S TECH MEDIA INC
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