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International Concrete Abstracts Portal

Showing 1-3 of 3 Abstracts search results

Document: 

17-078

Date: 

January 1, 2018

Author(s):

Asad Hanif, Yu Cheng, Zeyu Lu, and Zongjin Li

Publication:

Materials Journal

Volume:

115

Issue:

1

Abstract:

This study evaluates the suitability of fly ash cenosphere (FAC) for use in thin laminated cementitious composites (LCC). Laminated cementitious composites are reinforced concrete elements constructed of hydraulic cement mortar and closely spaced layers of mesh reinforcement. In this study, FAC was used in the mortar matrix instead of sand (a typical ingredient of hydraulic cement mortar). Various weight fractions (40, 50, and 60%) of FAC were used in preparing the mortars while discontinuous polyvinyl alcohol (PVA) fibers were also incorporated, in small amounts (0.50%), for improved matrix stiffness. Galvanized iron welded wire mesh and fiberglass woven mesh were used as primary reinforcement in LCC specimens. The resulting matrixes and LCC specimens were tested for mechanical properties and flexural performance. The properties of developed LCCs incorporating FAC were also compared with their counterparts fabricated with high-strength silica sand mortar matrix. Fly ash cenosphere was determined suitable in producing structural lightweight LCCs (specific strength range; 7.52 to 26.65 kPa/kgm–3 [17.47 to 61.92 psi/pcf]) with excellent mechanical properties while having improved the characteristic brittleness associated with lightweight composites. Further, FACincorporated LCCs exhibited better ductility even at lower peak flexural strength. A 50% FAC weight fraction has been proved to be the most efficient in producing strong lightweight LCCs for practical applications as structural elements.

DOI:

10.14359/51701007

Document: 

89-M33

Date: 

May 1, 1992

Author(s):

S. P. Shh, M. E. Krguller, and M. Sarigaphuti

Publication:

Materials Journal

Volume:

89

Issue:

3

Abstract:

Presents a study of the efficiency of shrinkage-reducing admixture (SRA) in controlling restrained shrinkage cracking of concrete. Three different types and amounts of SRA were used. A free shrinkage test and a restrained shrinkage test (ring test) were performed. The test results of the SRA concretes were compared with concrete reinforced with steel, polypropylene fibers, and wire mesh. At the same time, using free shrinkage specimens, weight losses were measured. Pore-size distribution was determined and the flow rate of fresh concrete was also measured. The results show that the addition of SRA significantly reduces free shrinkage. The addition of shrinkage-reducing admixtures also caused a considerable reduction in crack width.

DOI:

10.14359/2593

Document: 

84-M28

Date: 

July 1, 1987

Author(s):

Antonio Nanni and Ronald F. Zollo

Publication:

Materials Journal

Volume:

84

Issue:

4

Abstract:

Ferrocement makes use of layers of reinforcement that are most often in the form of welded or woven wire mesh and expanded metal. These materials, in the sizes and gages commonly used, are not generally intended for applications in engineered systems and,

DOI:

10.14359/1615

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