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The steel shuttering pinches the top surface of a concrete slab due to the weight of the next slab being constructed. Concrete slabs, block walls and pipelines are susceptible to cracking during ground settlement, seismic tremors or other sources of vibration, and also from expansion and contraction during adverse temperature changes.
Another factor in stain removal is the fact that stains can sometimes comprise two separate staining agents, which require separate forms of removal. A machine oil stain could also contain traces of metal, for example. [1] Also of concern is the color of the material that is stained. Some stain removal agents will not only dissolve the stain ...
The toilet seat is the cleanest place in the house. Confirmed Adam tested this myth just out of curiosity. When the results were compared to the bacteria samples from the "Five-second Rule" tests, the toilet seat actually proved cleaner than all other surfaces tested. This myth was explored further four seasons later in Hidden Nasties.
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The toilet is removed and the plumber discovers the source of the clogged toilet drain: a doll head that had been flushed down the toilet. Scott has Amie's accent wall repainted with a dark color, but he is upset to see that the lines of the diamond pattern are still visible. The wall is re-textured and repainted again to fully remove the lines.
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 ...
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.
Oxidation of pyrite in clay formations in contact with concrete – this produces sulfuric acid which reacts with concrete. Bacterial activity in sewers – anaerobic sulfate reduction at work in the organic-rich sludges accumulated under water in the conduits produces hydrogen sulfide gas (H 2 S).