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2. Concrete mixer - Wikipedia

   en.wikipedia.org/wiki/Concrete_mixer

   Bagged cement is readily available in small-batch sizes, and aggregate and water are easily obtained in small quantities for the small work site. To service this small-batch concrete market, many types of small portable concrete mixers are available. A typical portable concrete mixer uses a small revolving drum to mix the components.

3. Power trowel - Wikipedia

   en.wikipedia.org/wiki/Power_trowel

   Blade pitch is controlled either by manual turn handles, (usually both spiders are linked together) or by electric motors and switches. Ride on power trowels range in size from 1.8 m (6 ft) machines weighing 270–320 kg (600–700 lb), up to 3.7 m (12 ft) machines weighing over 910 kg (2,000 lb).

4. Volumetric concrete mixer - Wikipedia

   en.wikipedia.org/wiki/Volumetric_concrete_mixer

   A volumetric concrete mixer (also known as volumetric mobile mixer) is a concrete mixer mounted on a truck or trailer that contains separate compartments for sand, stone, cement and water. On arrival at the job site, the machine mixes the materials to produce the exact amount of concrete needed.

5. Stephen Stepanian - Wikipedia

   en.wikipedia.org/wiki/Stephen_Stepanian

   Stephen invented a self-discharging motorized transit mixer that was the predecessor of the concrete mixer truck and applied for a patent in 1916. [2] However, the patent was rejected in April 1917 by the patent office because it was believed that a truck could not support the weight of a concrete mixer on top of it. [5]

6. Power tool - Wikipedia

   en.wikipedia.org/wiki/Power_tool

   The introduction of the electric motor (and electric distribution networks) in the 1880s made possible the self-powered stationary and portable tools we know today. [18] The global market for power tools is $33 billion (in 2016) and estimated to reach $46 billion in 2025.

7. Ready-mix concrete - Wikipedia

   en.wikipedia.org/wiki/Ready-mix_concrete

   Concrete has a limited lifespan between batching / mixing and curing. This means that ready-mixed concrete should be placed within 30 to 45 minutes of the batching process to hold slump and mix design specifications in the US, [15] though in the UK, environmental and material factors, plus in-transit mixing, allow for up two hours to elapse. [16]