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Degraded concrete and rusted, exposed reinforcement bar (rebar) on Welland River bridge of the Queen Elizabeth Way in Niagara Falls, Ontario. Concrete degradation may have many different causes. Concrete is mostly damaged by the corrosion of reinforcement bars due to the carbonatation of hardened cement paste or
The tornado crossed E Almar Dr where it re-intensified to mid-range EF2, a roof of an apartment complex was torn off and suffered partial wall collapse, a car was flipped and damaged, around the same time, the funnel of the tornado fully condensed to the ground. [8] A Dollar Tree suffered severe damage as some of the exterior walls collapsed ...
Inside the house, the most notable feature is a large rock fireplace in the living room, faced with quarried sandstone and having a simple wooden mantle. The concrete floor in the living room probably prevented serious damage to the house whenever sparks may have flown out of the fireplace. All other rooms in the house have wood floors.
Concrete has a total embodied energy of 1.69 GJ/tonne, lower per unit mass than most common building materials besides wood. However, concrete structures often have high masses, so this comparison is not always directly relevant to decision making. Additionally, this value is based only on mix proportions of up to 20% fly ash.
ASTM C1293: "Test Method for Concrete Aggregates by Determination of Length Change of Concrete Due to Alkali-Silica Reaction". It is a long-term confirmation test (1 or 2 years) at 38 °C in a water-saturated moist atmosphere (inside a thermostated oven) with concrete prisms containing the aggregates to be characterised mixed with a high-alkali ...
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