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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Showing 1-5 of 15 Abstracts search results
Document:
SP69-04
Date:
August 1, 1981
Author(s):
E. Robert Perry
Publication:
Symposium Papers
Volume:
69
Abstract:
The U. S. Electric Power companies purchase over $500 million insulators per year for outdoor and indoor use. A variation of polymer concrete appears to have the necessary characteristics to replace a large proportion of the insulation presently in use. Over four years of development and testing by the Electric Power Research Institute (EPRI) and its counterpart in Mexico indicate the material is now suitable for commerciali-zation. A wide range and variety of applications are expected.
DOI:
10.14359/6379
SP69-05
A. N. Zeldin, L. E. Kukacka, and N. Carciello
The feasibility of using the products of free-radical copolymerization of cyclic and linear organosiloxanes in the formation of polymer concrete (PC) composites for use in the completion of geothermal wells has been demonstrated. The PC contained a mixture of tetramethylvinylcyclotetrasiloxane and polydimethylsiloxane used in conjunction with aggregate materials such as silica flour and portland cement. The use of these compounds resulted in composites with high strength and with thermal and hydrolytic stability. Thermogravimetric analyses and compression strength tests at elevated temperatures have been used to determine the thermal stability of the composites. The results from these studies indicate that over the temperature range 25 to 350°C, the compressive strength is essentially constant at a value of -72 MPa and there is also a relatively low weight loss of polymer (-1.0 wt%). The hydrolytic stability of the composites was determined by using infrared spectroscopy on a variety of free and bonded OH functional groups before and after the samples were exposed to a 25% brine solution at 300°C. These results showed that the inclusi on of various additives such as Ca or Mg compound inorgan i c phase affects the hydrothermal stability. s in the Pumpability tests were also performed, and the results indicated that a PC slurry containing 35.5 wt% organosiloxane mixed with 64.5 wt% silica flour and cement as an aggregate did not change viscosity at temperatures of 150° to 165OC and a pressure of 36.5 MPa for at least 4.5 hr. Increasing the temperature to 205OC resulted in increased viscosity after 4 hr. The results from these studies indicated that this system can be used as a geothermal well-completion material.
10.14359/6380
SP69-06
Michael T. McNerney
The Air Force Engineering and Services Center (AFESC) at Tyndall AFB, Florida is currently engaged in a seven-year research and development effort to rapidly repair bomb damaged concrete runways. Polymer concrete because of rapid cure and high strength is one of the most promising methods of repair. The problems of moisture, temperature extremes and mechanization are all being studied for development of a rapid all-weather polymer concrete repair system. Research includes work at the University of Texas at Austin, AFESC, Battelle Columbus Labora-tories, Brookhaven National Laboratory, and the BDM Corporation. Polymers being considered include acrylics, epoxies, polyesters and furans.
10.14359/6381
SP69-07
D. W. Fowler, A. H. Meyer, and D. R. Paul
Potential solutions for improving the strength of poly-mer concrete made with wet aggregate have been investigated in re-search performed for the U.S. Air Force to develop rapid repair methods. Chemical additives, aggregate treatment, and addition of fibers have been evaluated." Moisture contents used in the re-search ranged up to 7 percent, with the maximum values usually 4 to 5 percent. No chemical additives for monomer were identified which provide significant strength increases. Aggregate treatments con-sisted of coated aggregate and moisture absorptive additives for wet aggregate. Aggregates coated with a silane coupling agent pro-vided very good strength even when the moisture content was in ex-cess of 4 percent. Several types of fibers were investigated; hooked steel fibers were found to provide the greatest strength. It was found that the addition of approximately 5 weight percent steel fibers provided good strength increases and ductility.
10.14359/6382
SP69-08
L. A. Kuhlmann
Latex modified overlays have been in service for over 20 years. This report summarizes the significant events during the development of this system and highlights data that have recently been generated by State Highway Departments and the FHWA in their continuing studies of field performance. Fifteen reports, covering 184 bridge decks, aged two months to 13 years, are reviewed. Specific comments regarding test methods, such as chloride pen-etration and half-cell potential, to measure performance, are included. Life expectancy, based on the testing done to date, as well as the actual life in the field, is projected to be a minimum of 15-20 years.
10.14359/6383
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