Roller Compacted Concrete
Roller Compacted Concrete
(OP)
I am about to oversee a project involving the placement of RCC in an environment where the temperature remains at a constant 70 degrees fahrenheit. My question is do I need to saw cut expansion joints?





RE: Roller Compacted Concrete
RE: Roller Compacted Concrete
RCC is a bit different than conventional concrete, but the older it gets, the more it tends to work like it.
RE: Roller Compacted Concrete
My situation is a mine haul road 1000m underground. I've already laid a modified RCC almost 2 years ago with an additive which prevents thermal expansion and renders the concrete 'flexible'. This material had 8% OPC and achieved 32MPa compressive and 10.2 MPa flexural strengths at 28 days. The compressive strength rose to 62MPa at one year.
I am considering there is no need for the additive with an environment which remains constant (temperature and humidity).
RE: Roller Compacted Concrete
RE: Roller Compacted Concrete
RE: Roller Compacted Concrete
Conversely blasthole stoping at moderate depth would not cause any cracking at all. Dony worry about the temperatures , talk to the rock mechanics
RE: Roller Compacted Concrete
RE: Roller Compacted Concrete
As an example in most coal mines........ low strength rock at relatively shallow depths, its common for the floor to heave upwards by 2 or 4 or 6 feet over a period of a few years at most. Do you think your concrete mix could withstand those kind of stresses?? Similarily block caving can completely collapse underground workings within weeks or months despite the application of steel rockbolts, 100mm of shotcrete AND concrete on the floor.
Let me put it another way, the expression "solid as a rock" is any oxymoron..... in the underground evironment it is moving all the time, the only question is whether its millimeters over decades or several inches / feet in less than a few weeks.
RE: Roller Compacted Concrete