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Title: Energy conservation potential of Portland cement particle size distribution control

Abstract

The main objective of Phase 3 is to develop practical economic methods of controlling the particle size distribution of portland cements using existing or modified mill circuits with the principal aim of reducing electrical energy requirements for cement manufacturing. Because of its scope, the work of Phase 3 will be carried out in 10 main tasks, which will be discussed in this report.

Authors:
;
Publication Date:
Research Org.:
Construction Technology Labs., Skokie, IL (USA)
Sponsoring Org.:
DOE/CE
OSTI Identifier:
6047458
Report Number(s):
DOE/CS/40419-T7
ON: DE91007543
DOE Contract Number:
FC07-82CS40419
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 42 ENGINEERING; PORTLAND CEMENT; GRINDING; ENERGY CONSERVATION; GYPSUM; MANUFACTURING; MODIFICATIONS; PARTICLE SIZE; PROCESS CONTROL; PROGRESS REPORT; ALKALINE EARTH METAL COMPOUNDS; BUILDING MATERIALS; CALCIUM COMPOUNDS; CALCIUM SULFATES; CEMENTS; COMMINUTION; CONTROL; DOCUMENT TYPES; MACHINING; MATERIALS; MINERALS; OXYGEN COMPOUNDS; SIZE; SULFATE MINERALS; SULFATES; SULFUR COMPOUNDS; 360601* - Other Materials- Preparation & Manufacture; 420200 - Engineering- Facilities, Equipment, & Techniques

Citation Formats

Tresouthick, S.W., and Weiss, S.J. Energy conservation potential of Portland cement particle size distribution control. United States: N. p., 1986. Web. doi:10.2172/6047458.
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Tresouthick, S.W., & Weiss, S.J. Energy conservation potential of Portland cement particle size distribution control. United States. doi:10.2172/6047458.
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Tresouthick, S.W., and Weiss, S.J. Wed . "Energy conservation potential of Portland cement particle size distribution control". United States. doi:10.2172/6047458. https://www.osti.gov/servlets/purl/6047458.
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@article{osti_6047458,
title = {Energy conservation potential of Portland cement particle size distribution control},
author = {Tresouthick, S.W. and Weiss, S.J.},
abstractNote = {The main objective of Phase 3 is to develop practical economic methods of controlling the particle size distribution of portland cements using existing or modified mill circuits with the principal aim of reducing electrical energy requirements for cement manufacturing. Because of its scope, the work of Phase 3 will be carried out in 10 main tasks, which will be discussed in this report.},
doi = {10.2172/6047458},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Jan 01 00:00:00 EST 1986},
month = {Wed Jan 01 00:00:00 EST 1986}
}
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Technical Report:
View Technical Report (0.69 MB)
DOI:  10.2172/6047458
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  • ; ;
    The work described in this report has clearly demonstrated that portland cements made with specific narrow particle size distributions, referred to herein as ''CPSD cement.'' perform as well as or better than ''normally fround'' portland cements in concrete. Methods of optimizing the composition of CPSD cements were developed and refined. CPSD cements with a maximum particle size (upper fifth percentile diameter) or about 30 micrometers were found to be most suitable for general concrete applications. Production of such cements results in a savings of 28% of finish grinding energy, or 13 kWh/ton (0.13 MMBtu/ton fossil fuel equivalent). It was calcualtedmore » that complete conversion of the US cement industry to the production of such CPSD cements, on the basis of projected 1984 production levels, would result in the following total annual national energy savings: 1.3 x 10/sup 9/ kWh/y of electrical energy (14 x 10/sup 1/aat Btu fossil fuel equivalent; 11 x 10/sup 12/ Btu/y of fossil fuels. 28 refs.« less

  • Test results are presented which more precisely define the amounts of fine particles required to obtain both adequate paste flow and strength development in Portland cement. Controlled particle size ranges with maximum sizes of 45, 20, and 14 microns were used with various amounts (0 to 45%) of 8 to 1 micron added fines. Better strength development was obtained with a maximum particle size of 20 microns than with 45 or 14 microns at equal finenesses, (2,900 to 3,000 cm/sup 2//g), or with normally ground cement of higher fineness (3,655 cm/sup 2//g). The flow of pastes made with this 20more » micron cement was not quite as good as that of the 45 micron or normally ground cements. The data indicate that increasing the maximum particle size to 30 microns may be advantageous, and that the amounts of added fines for optimum performance lies between about 10 and 25%. Materials are being prepared for the further tests with maximum particle sizes of 30 and 20 microns with 10 to 25% fines additions.« less

  • Progress is reported on the energy conservation potential of Portland cement particle size distribution control. Results of preliminary concrete tests, Series IIIa and Series IIIb, effects of particle size ranges on strength and drying shrinkage, are presented. Series IV, effects of mixing and curing temperature, tests compare the properties of several good particle size controlled cements with normally ground cements at low and high temperatures. The work on the effects of high alkali and high sulfate clinker cements (Series V) has begun.

  • The properties of cements with carefully controlled particle-size distributions were compared with those of normally ground cements having a Blaine fineness of about 3600 cm/sup 2//g. Progressive reduction of the maximum particle size to 20 microns improved strength development. Further reduction to about 14 microns decreased rather than improved strength development. Some of these particle-size-controlled cements produce as-high, and often much-higher, strengths at ages from 1 to 60 days at Blaine finenesses 450 to 800 cm/sup 2//g lower than the normal grinds of the same composition. The cements with 20-micron maximum-size particles can have finenesses as low as 2800 cm/supmore » 2//g, whereas with larger particles, higher specific-surface areas are required for equal strengths. The improved strengths were a result of more-rapid and more-complete hydration of the cement. Variations of clinker composition did not significantly alter these conclusions. Drying shrinkage of the particle-size-controlled cements was in some cases less than for normally ground cements. They also performed better than normally ground cements over a wide range of mixing and curing temperature (42/sup 0/F to 100/sup 0/F). Direct energy conservation of 27% in finish grinding and 8.5% in more-efficient utilization of the cement is estimated to result from the use of particle-size-controlled cements. For a US production of 75 million tons, this corresponds to conservation of 46.5 trillion Btu/year.« less

  • ;
    The main objective of Phase 3 is to develop practical economic methods of controlling the particles size distribution of portland cements using existing or modified mill circuits with the principal aim of reducing electrical energy requirements for cement manufacturing.