NCABulletin 1   May 2012  
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To coal ash fellows wherever you are,

The Israeli National Coal Ash Board (NCAB) is pleased to announce the launching of NCABulletin - an electronic magazine dedicated to reports on NCAB's activities in the coal ash area.

Through its periodical updates NCABulletin will provide information about R&D projects, environmental research, analytical enquiries as well as description of licensing procedures, in order to serve as a platform for information exchange for the sake of promoting beneficial utilization of coal ash, in ways that are:

Environmentally responsible,

Technically sound,

Commercially competitive, and

Publicly acceptable.

The current issue of the NCABulletin contains information about the following ongoing projects:

Determination of the benefits of the use of fly ash in concrete

Stabilization of shifting sands using fly ash

Leachability of elements in cement mixtures containing fly ash

We wish you interesting reading and ... everlasting ash.

Omri Lulav

Managing Director, NCAB
A member of the international organization WWCCPN




Effectiveness of fly ash as a substitute for cement in concrete and as a mean to reduce CO2 emission

A study of the effectiveness of coal ash in concrete using cements of different types: Prof. Arnon Bentur, Prof. Amnon Katz, National Building Research Institute at the Technion.

Brief overview

The production of clinker, which is the main raw material for cement, involves the emission of considerable amounts of CO2, known as a "greenhouse gas". Taking advantage of the technological benefits of mineral alternatives such as fly ash can bring about a reduction in the emission of the greenhouse gas into the atmosphere.

The study is being conducted jointly with Nesher, a major cement producer, and the Association of Readymix and its objective is to prepare a technological infrastructure for the standardization of new high-quality cements and concretes containing a reduced amount of clinker. At an earlier stage of the study, an unsuccessful attempt was made to improve the replacement coefficient between coal ash and cement as dictated by the concrete standard, due to a change in the type of cement. At the current stage it is intended to ascertain that the benefit derived from the addition of the ash is maximized through technological coordination with the cement and concrete manufacturers.

To read an extended description click here


Agricultural Research Organization



Fly ash to encourage the development of biogenic crusts in sandy soils to stabilize shifting sands

An examination of the use of coal ash to stabilize soil surfaces to prevent erosion damage in sandy soil by encouraging the development of biogenic crusts. Dr. Eli Zaady, Gilat Research Center; and Dr. Yitzhak Katra of Ben-Gurion University in the Negev; Dr. Shlomo Sarig of the Katif Center; Dr. Naftali Goldshlager of the Erosion Station, Israeli Ministry of Agriculture.

Brief overview

The sandy soils in the northern Negev are naturally stabilized by biogenic crusts (which are formed by photosynthetic microorganisms) as long as they have not been exposed to anthropogenic (caused or produced by humans) disturbances. The preparation of land for agricultural use, executed by heavy equipment that flattens the surface, harms the natural stability of the soil surface, leading to the exposure of the newly developed agricultural areas to wind erosion damage.

The study will examine the hypothesis that the addition of fly ash to the upper soil layer stabilizes it and creates conditions that enable the redevelopment of biogenic crusts that stabilize the sandy soil.

To read an extended description click here





Test of pollutants in leachates of bound mixtures containing fly ash used for infrastructures

To determine the concentrations of trace elements in general, and specifically of heavy metals released from cement bound mixtures containing fly ash in CLSM and grouts intended for underground infrastructures. Dr. Nadya Teutsch, Geological Survey of Israel.

Brief overview

CLSM (Controlled Low Strength Materials) and grout are two types of cement slurry in which coal ash is used as a filler to improve the flow features.

In infrastructure applications, the CLSM and grout may come in contact with runoff water and even groundwater, and consequently it is important to measure the extent of the leaching of polluting elements as a result of the addition of coal ash to the slurry. The working assumption, based on tests carried out on samples in the past, is that the cement slurries containing ash, even at relatively high proportions, are safe for use underground and do not pose a danger to groundwater.

To read an extended description click here




NCAB's activities survey

To review NCAB's R&D activities aimed at promoting beneficial uses of coal ash,

click here







National Coal Ash Board



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Tel-Aviv 67134

Tel: +972-3-6257000
Fax: +972-3-6257001



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The National Coal Ash Board (NCAB) is a governmental agency that was established in 1993 by the Ministry of Energy and Infrastructures (known today as the Ministry of Energy and Water), in cooperation with the Ministry of Environmental Protection, the Interior Ministry, the Israel Electric Company (IEC) and the National Coal Supply Company (NCSC), with the objective of coordinating a national effort to find a solution to the coal ash accumulating at the coal-fired power stations.

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