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These plants are even adapted to withstand long periods of drought. The h ar dy ones, originate from high elevation areas of South Africa, need at least 500 mm rainfall in the summertime. Rainfall above 300 mm is critical for survive.

Include spots with poor soils or rock crevices. Habitats from seashore to forest are colonized and are not hardy. Not all species are realy hardy, though it isīelieved that there are more undiscovered hardy varieties. Who have them in their gardens probably do not realize they are This hardy ice plants have become so well used, that people Brown in 1925ĭelosperma is in desperate need of taxonomic attention. Since its establishments as a genus by N. Delosperma is a genus that require very little Look down and see some of my new hardy delosperma seedlings. Process is repeated year after year until the best plant remain. It is the diversity of gene combination which may hold a Hundred of individual crosses are carried Skill of the plant breeder is getting the jackpot by combining theĭesired characteristics. Theīreeder is seeking to combine a range of traits in one plant. This plant characteristics are determined by genes. Selected parents can be cross-pollinated to combine desiredĬharacteristics, like cold hardy plants from the Drakensberg Now his work became the basis of my plant breeding In his own lifetime Mendel´s work went largely Principles of plant breeding remained unchanged from Mendel´sĭiscovery. World, like Volkmar Schara and Eugen Schleipfer in Germany, Martin Only a few private plant breeders are active across the These plants are becoming known widely due the work of Dr. Much of the basic work is still conducted by private In Teil 3 werden dann Verwertungsvarianten beschrie-ben, die in eigenen Forschungsprojekten entwickelt wurden.Never ending. Auch in Teil 2 werden verschiedene in der Literatur beschriebene Verwertungsvarianten vorgestellt. Die Eigenschaften von zu Recyclingbaustoffen aufbereitetem Mauerwerkbruch, die für die Verwer-tung ausschlaggebend sind, wurden dargestellt. Im ersten Teil dieses Berichtes zur Verwertung von Mauerwerkbruch wurde ein Überblick zu Anfallmen-gen, Verwertungsquoten und Einsatzgebieten gege-ben.

Utilisation variants which were developed in own research projects are described in Part 3. Also in Part 2 introduce different utilisation variants described in the literature are. The properties of masonry rubble pre-pared as recycling construction materials, which are decisive for their utilisation, were discussed. In the first part of this report on the utilisation of masonry rubble, an overview was given of the quantities arising, utilisation quotas and fields of application. KeywordsPorosity-Density-Recycled aggregates-Construction and demolition waste-Concrete Industrial gravity separators may lead to the production of high quality recycledĪggregate from mixed C&D waste for structural concrete applications. This experiment, separation using a 2.2kg/dm³ suspension produced recycled aggregate (porosity less than 17%) which yielded Sink and float technique is a simple laboratory density separation tool thatįacilitates the separation of cement particles with lower porosity, a difficult task when done only by visual sorting. For concretes produced with constant volume fractions of water,Ĭement, natural sand and coarse aggregate from recycled mixed C&D waste, the compressive strength and Young modulus are directĮxponential functions of the aggregate porosity. Ratios were produced and the mechanical properties measured. Concretes using a variety of C&D aggregate porosity classes and different water/cement This paper investigates how the classification of C&D mixed coarse aggregate according to porosity influences Techniques capable of reducing this variability is instrumental for quality control purposes and the production of high qualityĬ&D aggregate. Highly variable, and this restricts the use of such aggregate in structural concrete production. The properties of recycled aggregate produced from mixed (masonry and concrete) construction and demolition (C&D) waste are