Engineering Stack Exchange
Engineering Stack Exchange

Questions tagged [concrete]

For questions about the material concrete, or its application in an engineering context. Concrete is a composite material composed mainly of water, aggregate, and cement.

128 questions
3
votes
1 answer

Can plasticizer leach out of cured concrete?

About 6 months ago I have poured concrete in a plastic mould. The mould was plastic plinth for sun umbrella. It is usually filled with water but it cracked so I filled it with concrete. Before pouring I glued the cracks with generic cyanoacrylate…
o115208
  • 31
  • 1
2
votes
2 answers

What are the regular holes in poured concrete walls called?

These holes are caused by bars that are put through the frame before the concrete is poured and then clamped, so the mold can't swell outward. Is there a name for these holes though that is widely recognized?
Rekov
  • 187
  • 1
  • 1
  • 6
2
votes
0 answers

Why do we dig holes and fill them in with concrete?

I'm watching construction of a new building across from my office. The old building has been demolished and the demo team has completed taking everything away and a new company has come in to start working. The new building will have a five floor…
Michael Conlen
  • 121
  • 2
1
vote
1 answer

XPS foam panel as decoupling membrane for concrete pour over existing concrete slab?

Mortared bricks have been removed from a 50-year-old 12' x 12' concrete slab patio, leaving a rough surface and exposing a curved crack in the concrete which is about six feet long. If small-diameter pea-gravel is spread onto the rough surface to…
Tim
  • 205
  • 1
  • 7
1
vote
1 answer

installing swing hook before concrete is poured

I want to place a swing hooks in place before the concrete is poured so that , i dont have to drill a hole later. My contractor is not ready to make these bolts with TMT bars itself.. what kind of hooks or bolts should i buy for this purpose and how…
shilpa
  • 11
  • 1
1
vote
0 answers

House construction using concrete panels

Background Information Currently looking to buy a house in the Southampton area in the UK and have noted there are quite a few houses which use a concrete panelling construction technique see example image below: Some are advertised as Reema…
Suze1990
  • 11
  • 1
0
votes
0 answers

Concrete curling not ground slab

Hi I live on a first floor apartment I can feel some waves in my concrete floor I do not know if this poses any issues as it is not a ground floor slab
user47379
0
votes
1 answer

Residential Post Tension Slab Setup

Background: Residential single story post-tension slab approximately 2300 sq. ft. new construction. Contractor has installed formwork and laid out post tension cables. Contractor has "overstripped" the sheathing from the post tension cables…
FM2020RI
  • 3
  • 1
0
votes
1 answer

Question about commercial mix concrete design

What should I do here? Drying the aggregates prior to mixing make sense to me but would it be costly?
AliceRathbone
  • 115
  • 4
0
votes
1 answer

Is there a substance i could treat concrete with to make it not scratched by steel?

Is there a substance i could use that would harden the surface of concrete enough to make it resist scratching by steel?
Francis L.
  • 378
  • 2
  • 11
0
votes
0 answers

Building Engineering - Lightning Conductor

I went on a new building, for installing many "details" before people relocating inside. On the roof, I saw a very intriguing things about lightning conductor : they are inside walls, packed inside the concrete (like the green things in the…
Megagolgoth
  • 1
  • 1
0
votes
2 answers

Modeling of a strap beam/foundation tie beam

The purpose of a strap beam (or tie beam - i'm not sure of the exact expression on english) as far as I know, is to enable foundation (horizontal) stifness. So my question is: how to model them correctly? In case of a foundation - we add support…
Xa0c
  • 1
  • 2
0
votes
1 answer

Live and dead loads on lift core (passenger and cargo)

According to Eurocode or even better - JUS standards (if there is someone from EX-JU countries here), what are the dead and live load values and schemes for reinforced concrete lift core for both cases: passenger lift and cargo lift? How do you…
Xa0c
  • 1
  • 2
0
votes
2 answers

Creep coefficient over time

I came across 2 creep coefficient diagram. First one is from Eurocode, second one is from elsewhere. I think the second one make sense, As the time progress, the creep coefficient shall increase, hence, the effetive modulus of concrete shall…
utk2366
  • 61
  • 1
  • 1
  • 7
0
votes
2 answers

Is there a standard formula available to calculate lateral concrete pressure from the measurements of lateral concrete strain?

As shown in the image, I have done a vibrating wire type strain gauge and pressure cell (not shown in the image) instrumentation on full scale form. the objective is to measure the lateral pressure of the concrete on the form while concrete was…
Aayvu.com
  • 163
  • 4
1
2