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Hi everyone, Has anybody run structural analysis of the precast multi-cell concrete tanks. The way this tanks constructs is pouring cast in place base slab usually 12" thick with grooves 4" deep at the location of exterior walls and interior wall dividing the cells and the groove is about 7"...

Hi Everyone Does anyone have a suggestion of a study guide or a source of Sample exams or previous solved civil service exams for Associate Civil Engineer Exam. Iam taking the Exam in Suffolk County - NEW YORK STATE. The exam is going to be in the following areas: 1.Principles and practices...

Hi everyone, I would appreciate if anybody has experience with design of overhead pipe steel frame support and supports base foundation can guide me. I need to get to any website that offer design aid or has design examples. I working on a project that has 24" line of fiberglass duct that...

Hi everyone, I am reviewing a concrete mix for tanks walls and the contractor proposing to pour grout mix at the bottom of the tank walls to avoid separation and honeycomb at the bottom of the walls. The grout mix consists of Portland cement, sand, water and admixture (Glenium 3030). I would...

Hi everyone, During the construction of a one story building a conflict on the architectical plans has been discovered between the doors and louvers lintel elevation and bond beam elevation. The contractor wants to stop the bond beam where it meets the lintels and add a small bond beam above...

Hi everyone, Is there any limit by code specifing the maximum number of courses per day for a concrete block wall supporting a roof slab for one story building (10 feet high)? Is block settling should be an issue to compress the mortar between the courses if the whole height built on one day...

Hi everyone, I am reviewing design calculation for a precast concrete building (10'x20'x9') to be used as a control building. The roof slab, wall and floor slab are pre-cast concrete connected with steel brackets at 6 locations on top and bottom of the wall. What are the loading cases should be...

Hi everyone I am working on a project of Two outdoor round oil tanks restoration. The tanks are supported by steel cradels anchored to concrete pad. The steel cardels are showing damage(rust)due to the location of the tanks ( 20 ft from the shore). I am looking of the best way to restore the...

What is the recommended concrete cover for wastewater concrete tanks permanently in contact with corrosive soil? Is there any reference of minimum 3" cover for concrete cover on earth side? How about if ground water level is high? Thanks

Gary, This is my first time designing an odor control system to replace an old odor control system in a weaste treatment plant; I’m hoping you can educate me. The ductwork on the original odor control system ran below the ground, and was constantly filled with water and therefore did not work...

Hi everyone, I am reviewing a large collection system plan that includes sections crossing parkways and sewer jacking to be used under the main highways. The plans call for 18" SDR 35 PVC pipe as a carrier and 28" steel casing. Is the SDR pipe acceptable as a carrier or should DR 18 or...

Hi everyone, Is anybody familiar with PVCO pipe and the main differences between C909 and C900. Is there any Deflection issue using C909 since it has less wall thickness than C900. Is there any website to get more information? I was looking for any evaluation study for C909 VS C900. Thank You

Hi everyone, I am working on design of 45'x 45' wastewater tank cover and our O&M department is interested in Aluminum flat cover (Aluminum deck supported with Aluminum built up hollow rectangular beeams). Is there any standard tables for aluminum hollow sections or any other design aid...

Hi every body, I am reviewing a design of reinforced concrete section to close seven circular opens ( one foot diameter each and one foot apart (edge to edge) . the seven opens are located at the corner of dividing wall between a 22'x 60'tank and 18' x 60'tank with 15' hieght and the seven open...

Hi Everyone Does anyone have a suggestion of a study guide or a source of Sample exams or previous solved civil service exams for senior Civil Engineer Exam. Ia taking the Exam in NYS. The exam is going to be in the following areas: 1.Principles and practices of civil engineering...

I am reviewing a concrete design mix that is rich in cement about 752Ib per cubic yard (1120 Ib of sand and 1750 Ib of crushed gravel) 45 oz per yard of Glenium would be added at the site after verifying 3"+/- 1" initial slump the final slump as per lab for the above dosages is 6.25" and final...

Hi everyone, During the construction of Sewage treatment plant building foundation, about 15 old leaching pools have been found during the excavation. The leaching pools bottom elevation is about 8 feet deeper than the bottom elevation of the tanks bottom slab. Some of the leaching pools are...

Hi Everyone I am working on a problem of concrete column ( 12"x12") in a wastewater treatment plant tank. The column is a cantilever type and wooden baffles are installed between the column and the tanks wall inside vertical steel channels attached to the column and the wall . Due to lateral...

Hi everyone, I am trying to solve a problem caused due to building up of toilet paper in sewer line leading to pump station. The sewer line and the pumps need to be cleared from toilet paper almost every week as the solids building up is causing surcharge in the manholes and also clogging the...

Hi everyone, During the installation of pre-cast concrete wet well, the joint between the base section and the ring above had been damaged. The wet well is in ground water and there is ground water seepage into the wet well after the installation. I was looking at some concrete repair...