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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 18 Abstracts search results
Document:
SP89-06
Date:
December 1, 1985
Author(s):
Mohamed A. H. Abdel-Halim and Richard M. McClure
Publication:
Symposium Papers
Volume:
89
Abstract:
Conventionally reinforced concrete beams and polymer portland cement reinforced concrete beams were loaded to ultimate to determine the flexural behaviour. Two-point symmetrical loads were applied. Load-deflection and moment-curvature curves were predicted and compared with the observed ones. Reasonable agreement has been found. Polymer portland cement concrete beams were capable of utilizing higher percentages of reinforcement as compared to the same size ordinary beams. A P.P.C.C. beam developed 27% higher ultimate load, 46% greater deflection, and twice ductility. The maximum concrete flexural compressive strain,E CU for P.P.C.C. beam was higher than that of a companion control beam, and in general, it was found that plastic properties of P.P.C.C. beams are better than those of control beams. The maximum crack widths in P.P.C.C. beams were larger than in control beams, but the number of cracks in P.P.C.C. beams is less than that in ordinary beams.
DOI:
10.14359/6245
SP89-07
Peter Mendis
Almost every structure where concrete or steel are used is vulnerable to the corrosive effects of chemical and environmental attack, as well as me-chanical abuse due to stress and vehicular traffic. Severe deterioration of such structures can result in the commercial, industrial and transportation areas. Epoxy resin based polymer products are used for the rehabilitation, repair and protection of both existing or newly constructed structures.
10.14359/6246
SP89-08
Arthur M. Dinitz and Russ Ferri
P.C. (MMA) systems have been in use for over 20 years and have become one of the most promising materials for the rapid repair of concrete, especially bridge deck repairs. The major bridge applications include joint and spa11 repairs, thin bonded overlays, and deck impregnation. The latest design concept utilizing P.C. (MMA) is for modular bridge deck replacement using the P.C. (MMA) for bearing pads, for joining individual panels and for contraction joint pours. Pre-packaged systems consist of two components, a pre-mixed powder that contains fine aggregates coated with polymers, initiators and pigments and a liquid monomer component (Methyl Methacrylate). The practical success of the systems have been due to the application technology developed through applied research by commercial firms. Repair work with P.C.(MMA) is similar to work using Portland Cement Concrete and proper surface preparation is essential to the successful use of P.C. (MMA) for rehabilitation. P.C. (MMA), has many advantages over conventional concrete, including among others, rapid setting, ease of use, usability in hot and cold temperatures and water and salt resistance. P.C. (MMA) can also be feathered to "zero". There are several different P.C. (MMA) systems, each ideally suited for a particular application (i.e. thin overlays, spa11 repairs, etc.) and any questions related to its use should always be checked with the manufac-turer.
10.14359/6247
SP89-09
Yu Feixiong and Huang Yiun-yuan
A PIG of 2400 kg/cm 2 compressive strength is obtained by use of an ordinary cement mortar of 600 kg/cm2 compressive strength (W/C = 0.5, S/C = 2.5 : 1 by wt.) as matrix and MMA as its impregnant with impregnation and thermal catalytic polymerization under high pressure up to 200 atmospheres. Using the same materials, the compressive strength of the PIC obtained with ordinary impregnation is only 1600 kg/cm2. The polymer loadings of the former and the latter PIC are 9.2% and 7.5% respectively. The following contribute to the super-high compressive strength of this PIC: (1) Minimizing the effect of residural air; (2) Overcoming the airblock effect due to ink-bottle-shaped pores during impregnation; (3) Reducing the effect of shrinkage of impregnant during polymerization; and (4) Increasing the interfacial area and adhesive power between matrix and polymer.
10.14359/6248
SP89-10
M. Kawakami, H. Tokuda, K. Ishizaki, and M. Kagaya
The tensile-splitting stress distribution for partially polymer-impregnated concrete is mathematically predicted from the viewpoint of theory of elasticity, and the results are confirmed by experiments. It is shown that tensile-splitting load to par-tially polymer-impregnated concrete cylinders can be predicted by the proposed failure mode and compressive strength can be adapted to the law of mixtures for composite materials. Furthermore the experimental equation proposed by Knudsen for the relation between strength and porosity for a porous brittle crystal body is examined. The obtained strengths for partially polymer-impreg-nated concrete can be evaluated more exactly than those heretofore in use.
10.14359/6249
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