I have a 60' x 16' x 8" thick reinforced concrete equipment slab on grade (exterior) that will be supporting electrical equipment. I want to put control joints in the slab because of the length to width differential. I considered saw cutting control joints but I will only be able to provide a...
Living in the south, set retarding admixtures are frequently proposed in mix designs. Moving into the fall/winter, I have some projects where I don't think a retarding admixture will be needed (due to temperature). I don't know much about the negatives of using retarding admixtures.
The PCA...
I have an existing bridge with pre-cast hollow core panels that has never been in service. As part of the bridge completion and renovation, I am specifying a 2" concrete topping slab and have the following questions:
1. Should I specify a bonding agent be applied to the existing precast...
I am trying to avoid using grade beams in an industrial renovation. It is essentially a new building being constructed inside of an existing shell.
I will have concrete piles spaced approx 8-10 feet in each direction with pile caps. Some will have two piles to a cap. The piles will be embedded...
I have a new concrete structure for a waste water treatment plant (divider walls creating 6 basins). The interior of the basins will be painted with a waterproof coating system. There is one basin wall that is shared with the equipment building. There are 6 different basins that would need to be...
I have an existing bridge in a high-end residential neighborhood - Kiawah Island, SC - that was constructed in 1993. The bridge was never used following construction because development of the area stopped. The client now wants to put a topping on the bridge and finalize for vehicular traffic...
I have a wastewater treatment plant structure near Charleston, SC with basins on 2/3 of length and 2-story building on other 1/3 (common wall between the two). The blower and pump room is in the bottom level of the building. I want to use concrete for as much of the building design as possible...
I need to identify the wood species of the members of a building. It is located in Portland, OR and is estimated to have been built in the 1920's. I have uploaded a picture of some truss members where you can see the wood grain pretty well. Any insight is greatly appreciated. I've always been...
It looks like there are a few joints between the precast wall panels that are too wide for the typical connection. In the attached photo, the lower 3 connections were welded but the upper 2 were not. It looks like the joint may have been slightly larger at the upper 2. I assume they will use a...
Hey all - Need to know how to analyze a steel pipe filled with concrete. I've searched the internet and found a couple of papers so have the allowable compressive strength now but still need allowable bending strength. Wondering if anyone has a good source. Don't have time to purchase a book...
hey there - I have two scenarios regarding the sloping of concrete slabs for which I would like some opinions.
1. typical concrete slab on grade (6" or 8") used for maintenance facility type application; has multiple floor drains to which we need to slope the slab. The building dimensions...
Hey - I am in need of a good book on concrete mixes. Specifically, I need information on admixtures and recommendations of such for different applications. I have a large environmental structure and need options to consider for reducing heat of hydration and avoiding the side effects of water...
Hey all - I am looking over some design information provided as a preliminary phase of a project. Part of the design requirements is blast resistance. Some initial blast analysis has been done and the incident and reflected pressures are stated/provided. Can someone explain to me what I'm...
Hey all - I have developed a spreadsheet to come up with all the design values in ACI 350.3-06 but having never used this reference before, I don't know if everything is working as it should. Does anyone have a design worked out (using ACI 350.3-06) that you would be willing to share with me...
Hey all - I have searched the threads and did find a good one (thread256-237000) that discusses compressor foundations. However, my question is regarding an elevated support for 4 process blowers. The compressors are about 76 kips each and the plan (another engineers' design) is to place them...
Hey - I know this has been in several threads in the past and after reviewing those, I still have questions. I am too wrapped up in the details and I can't see the big picture anymore.
I understand that E is broken into horizontal and vertical for the load combinations and that we will have...
Hey all - I am working on a large waste water treatment plant. We will have a lot of waterstops specified. I know that personal preference is a factor here but can you please tell me what type of waterstop you prefer to use/specify and why? Practicality of construction is definitely a...
Which of the two (A or B) is the correct way to detail the interior horizontal bars of a concrete corner/ intersection? Assume that the walls are exposed to lateral on both sides.
I've uploaded a pdf -- CORNER_RF.pdf
Thanks
