Monthly Archives: January 2015

Concrete reaction

The alkaline reaction of the concrete protects the reinforcing steel against corrosion. Where does this alkaline reaction come from??
During the hydraulic hardening of cement, which is a binder in concrete, a significant amount of calcium hydroxide is formed (lime lye). It is calcium hydroxide that is the source of alkaline …

Efflorescence on plaster

Inside the room, on a brick wall, dark joints are marked between the wall blocks.
What is a cause of it?
There are so-called. thermal bridges. Due to the insufficient thermal insulation properties of the wall, mortar joints are visible on it. Due to increased flow …

Scratches in plaster and mesh cracks

On the smoothly blurred facade of the building, covered with plaster made of PIIa mortar, cracks of a dynamic nature and mesh cracks appeared on a large surface.

The old paint coating from dispersion paint shows no damage and sticks to the substrate well, but it is …

Cast

Cast

How does plaster bind?
Gypsum is chemically bonded by attaching water. The water lost during firing combines with the gypsum again during its setting after adding mixing water.

Please explain, why gypsum is not suitable for external use…

Thickness of the thermal insulation layer made of expanded polystyrene

Please calculate the thickness of the thermal insulation layer made of expanded polystyrene, so that the partition analyzed above would reach the value of the k-factor below 0,40 W/(m2K). The influence of the adhesive layer and the protective coating on the thermal insulation layer can be neglected here. Thermal conductivity for polystyrene is 0,04 …

Painting with a roller Painting with a roller. Wide paint rollers are used to paint walls and ceilings 18-25 cm, covered with natural fur, often screwed onto extensions of various types. Also all ... 13.3k views | under Construction
Buildings of the ZL category Buildings of the ZL category According to the division of buildings according to their purpose and method of use, residential buildings, collective residence and public utility and parts of buildings constituting ... 12.7k views | under Architecture
Cast iron and steel in construction Cast iron and steel What is the difference between steel and cast iron? Steel contains less than 1,7% coal, while in cast iron it is 2-4% coal. Carbon content in ... 8.9k views | under Construction
Calculation of escape routes The width of horizontal escape routes is calculated in proportion to the number of people who can stay on a given floor of the building at the same time, assuming at least 0.6 me and 100 people ... 8.3k views | under Architecture
Installation of corrugated bitumen sheets Installation of corrugated plates - The even surface determines the tightness of the cover on the longitudinal and transverse overlaps of the panels. The top surface of the formwork or lat should form the plane of the roof slope ... 6.8k views | under Construction
Concrete reaction The alkaline reaction of the concrete protects the reinforcing steel against corrosion. Where does this alkaline reaction come from?? During the hydraulic hardening of cement, which is a binder in concrete, a significant amount is produced ... 6.7k views | under Construction
Building fire zones The basic assumption for the division of the building into fire zones and the resulting requirements, is to isolate the part of the building affected by the fire, in order to limit the possibility of fire spreading ... 5.5k views | under Architecture
Color cutoff Color cut-off Painting, is it the ceiling, or walls, we always start with the so-called. color cutoff, that is, painting the extreme places, borderline: corners, around the door trims and door frames ... 5.4k views | under Architecture
Metals in construction Metals in construction: • Aluminum is a silvery white metal, lekki, malleable, fusible, well conductive to heat and electricity, corrosion resistant. Used in construction ... 4.2k views | under Construction
Disadvantages of paint coatings Disadvantages of paint coatings The surface of the coating does not always turn out to be like this, what it should be like. Small lumps may appear on it, lumps, pollen. Usually it is ... 3.9k views | under Construction