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Fuchsjr, Thanks for your staright comments. I am the home owner and I meet today with the concrete contractor and the concrete supplier to discuss the wall problem. We tested the wall (14 day old) today with rebound hammer and the strength was 1500-1800 psi. We decided to have a core...

Thanks everyone, The rebound hammer I have is correlated at a testing lab. Before testing my basement wall I used the hammer to test basement walls of two adjacent homes and the results were between 3200 to 3500 psi as it should be. Certainly we will do the core test ASAP. I...

Ron & BigH, Thanks for your valuable advice. I will have the contract do the core test. If the 28th day strength comes out to be around 2200 - 2500 psi, is in that sufficient for a two story residential house with 5 to 6 feet backfill sandy clay against the basement wall?

Ron, Today I tested the Concrete wall (12 days old) by rebound hammer and the correlated strength is around 1500 psi. Since the bottom part of the wall was not protected from freezing at all and the top part was covered by a blanket only for 24 hours, I fear that concrete has been damaged...

I currently facing a situtation very simillar to you. I had a basement foundation poured for a new house on December 14th at Amherst, New York. . The high and low temperatures on that day were 32 and 20 degree. The high & low tempreatures on the next day were 40 and 24. The tempreatures scince...

Can some one tell me what is the going rate for 3000 psi concrete per cubic yard in North East (Western New York) for cold weather concreting (may need upto 150 cu. yard)? With type iii cement (w/c ratio 0.50 - 0.55, mixed with heated water, 5 - 7% Air content, and super plasticizer)...

I have a reinforced concrete basement wall for a new home poured by a contractor at Amherst, NY on December 14th. The high and low temperatures on that day were 32 and 20 degree. The high & low tempreatures on the next day were 40 and 24. The top half of the wall was covered by insulated...

Ron, Thanks for your response! Insulated blankets were placed on top of the wall but they were removed after 24 hours along with the form work. Also, the blankents only covered top half of the wall. For core test don't we have to wait for 28 days?

I have a reinforced concrete basement wall for a new home poured by a contractor at Amherst, NY on December 14th. The high and low temperatures on that day were 32 and 20 degree. The high & low tempreatures on the next day were 40 and 24. The water-cement ratio of concrete was 0.54 and type III...

I have a reinforced (#5 @24c/c vert. & hor. on each face) concrete basement wall for a new home poured by a contractor at Amherst, NY on December 14th. The high and low temperatures on that day were 32 and 20 degree. The high & low tempreatures on the next day were 40 and 24. The water-cement...