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Microwave Induced Polymerization of Monomer Impregnated Hardened Cement

Published online by Cambridge University Press:  15 February 2011

Joseph Hetz ,
John Chang  and
Morris Brodwin
Joseph Hetz
Affiliation:
Northwestern University, Dept. EECS, Evanston, II. 60201
John Chang
Affiliation:
Northwestern University, Dept. EECS, Evanston, II. 60201
Morris Brodwin
Affiliation:
Northwestern University, Dept. EECS, Evanston, II. 60201
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Abstract

It is well known that when pores of hardened cement are filled with a suitable polymer, desirable properties are greatly enhanced. With microwave induced polymerization, significant increases in compressive strength are observed.

Mortar samples with a sand cement ratio of 2.5 and water cement ratios, 0.3, 0.4, and 0.5, were molded and hardened. After sufficient hydration, they were evacuated, filled with MMA and pressurized. The samples were then processed in a dynamic multimode applicator. Temperature was monitored and they were processed until the temperature exceeded 85°C.

The principal result is the increase in compressive strength as compared to an untreated sample. For a W/C=0.5, and a sample hydrated for one day, the strength increased by a factor of6.0. In addition, the highly porous 1 day polymerized samples exhibited significantly greater strength than 28 day unpolymerized material.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 347: Symposium O – Microwave Processing of Materials IV , 1994 , 711
Copyright
Copyright © Materials Research Society 1994

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References

REFERENCES

1. Chang, J. and Brodwin, M., J.Microwave Power and Electromagnetic Energy, V. 28, 32 (1993)Google Scholar
2. Steinberg, M. et al, First Topical Report, BNL 50134 (T-509)and USBR General Report N.41, Brookhaven National Laboratory/ U.S.Bureau of Reclamation, Denver, December, 1968 Google Scholar