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2. Neat volume - Wikipedia

   en.wikipedia.org/wiki/Neat_Volume

   In civil engineering and construction, the neat volume is a theoretical amount of material.. For earthworks, it can refer to the volume either before native material is disturbed by excavation, or after placement and compaction is complete.

3. Sulfate attack in concrete and mortar - Wikipedia

   en.wikipedia.org/wiki/Sulfate_attack_in_concrete...

   A fairly well-defined reaction front can often be observed in thin sections; ahead of the front the concrete is normal, or near normal. Behind the reaction front, the composition and the microstructure of concrete are modified. These changes may vary in type or severity but commonly include: Extensive cracking; Expansion

4. Concrete - Wikipedia

   en.wikipedia.org/wiki/Concrete

   Concrete is a composite material composed of aggregate bonded together with a fluid cement that cures to a solid over time. Concrete is the second-most-used substance in the world after water, [1] and is the most widely used building material. [2] Its usage worldwide, ton for ton, is twice that of steel, wood, plastics, and aluminium combined. [3]

5. Calculator - Wikipedia

   en.wikipedia.org/wiki/Calculator

   By 1970, a calculator could be made using just a few chips of low power consumption, allowing portable models powered from rechargeable batteries. The first handheld calculator was a 1967 prototype called Cal Tech, whose development was led by Jack Kilby at Texas Instruments in a research project to produce a portable calculator. It could add ...

6. Concrete densifier - Wikipedia

   en.wikipedia.org/wiki/Concrete_densifier

   A concrete densifier is a chemical hardener that penetrates the concrete surface, reacting with the material to form crystals that fill the pores and increase surface density. This process significantly improves the concrete's resistance to wear, dusting, and chemical damage.

7. Sulfur concrete - Wikipedia

   en.wikipedia.org/wiki/Sulfur_concrete

   Sulfur concrete has a low porosity and is a poorly permeable material. Its low hydraulic conductivity slows down water ingress in its low porosity matrix and so decreases the transport of harmful chemical species, such as chloride (pitting corrosion), towards the steel reinforcements (physical protection of steel as long as no microcracks develop in the sulfur concrete matrix).