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International Concrete Abstracts Portal

Showing 1-4 of 4 Abstracts search results

Document: 

104-M72

Date: 

November 1, 2007

Author(s):

Homayoon Sadeghi Pouya, Eshmeiel Ganjian, Peter Claisse, and Seema Karami

Publication:

Materials Journal

Volume:

104

Issue:

6

Abstract:

The sulfate activation of basic oxygen slag waste (BOS) using plasterboard gypsum waste (PG) and cement by-pass dust (BPD) was investigated to produce a novel composite binder without using portland cement. The interactions between these three waste-derived materials were analyzed in terms of strength development of binary and ternary paste mixtures to establish the optimum mixture proportions corresponding to the highest compressive strength. The results show that crushed plasterboard gypsum waste can be used as a source of sulfate to form a novel sulfate activated pozzolan binder. It was observed that the optimum percentage of BOS and PG is affected not only by the type and characteristics of materials used, but also the order of optimization with which binary and ternary mixtures were made. It was found that BPD content has a great influence on compressive strength of binary and ternary combinations of BPD, PG, and BOS pastes.

DOI:

10.14359/18970


Document: 

96-M17

Date: 

January 1, 1999

Author(s):

Avraham N. Dancygier, David A. Yankelevsky, and Hadassa Baum

Publication:

Materials Journal

Volume:

96

Issue:

1

Abstract:

This paper presents an experimental study on the impact response of protective reinforced concrete structural elements that are coated with plaster on their interior faces. Even when a structural element’s perforation is prevented, impact conditions may initiate rear face scabbing due to high-intensity reflected tensile stress waves at the element’s rear face. Israeli standards for civil defense shelter design forbid any interior wall coating, such as plaster or wall tiles, as they may be easily detached upon impact and produce scabbing fragments. Following the Gulf War, a new Israeli civil defense policy became effective, where the protective spaces have been included within the dwelling units. Although plaster coating is the common finish work of the entire interior of a dwelling unit, it seems to a priori contradict the above requirements of scabbing prevention. Further study of the problem and investigation under impact conditions are therefore required to better understand the behavior of the concrete-plaster composite under local hard projectile impact. An experimental program was conducted at the laboratory and included response studies of reinforced concrete specimens to hard projectile impact. The specimens with plastered rear faces were impacted at the center of their front faces. The results showed different responses of various types of plaster coating and demonstrated the importance of parameters that affect the specimens’ performance under impact loads, which are mainly the plaster-background adhesion strength, the plaster density and stiffness, and the improved toughness of the plaster layer. The latter is obtained by reinforcing the plaster with a fiberglass mesh.

DOI:

10.14359/437


Document: 

90-M01

Date: 

January 1, 1993

Author(s):

Dinghai Hong, Weiguo Fan, Dekuan Luo, Yan Ge, and Yaxian Zhu

Publication:

Materials Journal

Volume:

90

Issue:

1

Abstract:

For economically and effectively solving the widely existing rehabilitation problem of marine reinforced concrete superstructures due to reinforcing steel corrosion damage in China, a kind of secondary anode (patented AS conductive mortar overlay) and a CN-1-type conductive plastic wire anode have been developed. One system consists of linear CN-1-type anode embedded in AS mortar overlay, and another one consists of a netlike CN-1-type anode embedded in OPC mortar overlay. These two new systems have been applied as anode systems on the bottom parts of some marine reinforced concrete superstructures, and impressed current cathodic protection was applied in sites normally for 3 years. Paper presents and discusses the results and the techniques in practice. It verifies that both anode systems of cathodic protection are highly effective for such structures, and the systems could also be applied economically and easily on a side or soffit surface by a plasterer.

DOI:

10.14359/4002


Document: 

90-M09

Date: 

January 1, 1993

Author(s):

ACI Committee 524

Publication:

Materials Journal

Volume:

90

Issue:

1

Abstract:

Guide is an update of ACI 524, "Guide to Portland Cement Plastering," which was published in 1964. There are a number of revisions reflecting increased knowledge of plaster and the use of current materials and methods. Recommendations for producing good portland cement-based plaster are described. Various characteristics, procedures, and alternates with advantages and disadvantages are given.

DOI:

10.14359/4043


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