The white settlers introduced animals for sentiment or for sport; later, the belief developed that New Zealand's native flora and fauna must eventually be replaced by the European. There was thus a vigorous policy of acclimatisation lasting from the 1840s to the first quarter of the present century. Some 53 exotic mammals were introduced (most of them deliberately) and of these 31 are at present living in a free state.
Concrete is a composite material composed of aggregate bonded together with a fluid cement which hardens over time.Most use of the term concrete refers to Portland cement concrete or to concretes made with other hydraulic cements, such as ciment fondu.However, road surfaces are also a type of concrete, asphaltic concrete, where the cement material is bitumen. lower water-to-cement ratio yields a stronger, more durable concrete, whereas more water gives a freer-flowing concrete with a higher slump. Impure water used to make concrete can cause problems when setting or in causing premature failure of the structure.
Stamped concrete serves as a low-cost alternative to other materials for paving and decorating. When properly installed, the concrete takes on the appearance of a more expensive material, including slate or brick. Installers can also make stamped concrete look like brick pavers or field stone.tamped concrete serves as a low-cost alternative to other materials for paving and decorating. When properly installed, the concrete takes on the appearance of a more expensive material, including slate or brick. Installers can also make stamped concrete look like brick pavers or field stone.