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I tried making concrete from crushed rock 5/8 minus with small particles included. The troubles I encountered were these:
1. The load of crushed rock did not seem to be mixed evenly enough, so there were some parts that were nearly all chips of rock with no sand.
2. Even in the parts that had a lot of sand, it seemed that once I poured the concrete from my mixer into the forms, there would be parts that had no "soup" to them. When I tried to float the sidewalk with a hand float, I could not tamp the rocks down. They were simply too dry, with the "soup" just going somewhere else. On the other hand, some parts of the pour would finish by hand reasonably well. However, I required a finished surface ... for the entire surface to have a finished look. That was almost impossible.
So what did I do? I found some sand and mixed 50/50 with cement and water, and tried to smooth that out over the surface. But it did not work too well, as some areas dried differently, more slowly. And when some was ready to broom, the rest of the little square area was too wet, so the broom just brushed the rocks back up.
Yes, I was able to finish that segment of the pour, but by the end of the day my arms ached and I was very discouraged. After that I stopped using crushed rock. I do not plan to use the crushed rock again. I will use the crushed rock for some other type of project, and start all over on the rest of the sidewalk, with smooth rock/aggregate that has the correct mixture of sand and various sizes/particles of material.
I might add that I have done numerous small concrete projects in the past. Never had one so difficult in my life. No more crushed rock for me in concrete.
Wiki User
∙ 14y ago
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How do i make concrete using nature?
Concrete IS nature, the aggregate is crushed rock, the cement is made of natural lime and clay, mix these together with water and you get concrete.
What is the density of crushed concrete?
The density of crushed concrete varies depending on the gradation and quantity of impurities (e.g. asphalt and other) but can be estimated at 1900-1950 kg/m^3.
How to make concrete?
Concrete is made from filler made of small pieces of rushed rock, gravel or sand held together with a water and Portland cement mixture. Different kinds of concrete use different ratios of the materials or even different kinds of material added to the mixture to give it strength, flexibility, durability or just to use recycled materals such as crushed glass bottles.
Is there a building material called PUMIS?
Pumiscrete has been used in buildings for many years. It is concrete that uses crushed volcanic rock rather than conventional sand and gravel
What is the Bulk Density of crushed concrete?
The density of crushed concrete varies depending on the gradation and quantity of impurities (e.g. asphalt and other) but can be estimated at 1900-1950 kg/m^3.
How do i make concrete using nature?
Concrete IS nature, the aggregate is crushed rock, the cement is made of natural lime and clay, mix these together with water and you get concrete.
Is concrete a rock?
No. Concrete is a man-made material composed broadly of cement, sand and aggregate (crushed rock).
What substance are used to make concrete?
cement, sand, water, aggregate(small stones) or sometimes crushed rock etc..
What kind of rock is a sidewalk?
Sidewalks are made of concrete, which is not a rock. Concrete is a man-made construction material composed of Portland cement, various crushed rocks, sand and water.
What materials are needed to build a highway?
concrete, graphite, crushed rock, lubricants, water, paint, tarmac, diesel
How do you make crushed rock candy?
Whack with hammer.
Explain how aggregates are processed for the use as a Portland cement concrete ingredient or as a bituminous concrete ingredient?
There is nothing special about the aggregate, it is simply crushed rock that has been washed.
Is there mining in Hawaii?
Yes, primarily surface mining of basalt rock to make crushed stone (for concrete, asphalt paving, and termite barriers) as well as mining of lava rock for landscaping. There is no coal, metal, or major mineral mining in Hawaii.
What is a nonrenewable resource used in concrete?
yes it is, it can be crushed and reprocess into alternative building materials
What types of benefits do explosives provide?
Explosives are the only affordable way to mine rock. Rock, in the form of crushed stone, is needed to make concrete and asphalt paving. Prior to their widespread use, roads in most of the US were a mess. Good roads are a significant benefit.
What did people use to paint?
blood for the colour red and crushed rcks in blood make brown and crushed rock makes black
What can you put on top of a crushed concrete driveway?
Pea gravel, crushed granite or asphalt.
