The sidewalks has been poured 3 to 4 years back. Recently the sidewalk concrete spalled at several locations. In our opinion the spalling is a problem related to finishing and workmanship. The contractor is blaming deicing chemicals for the problem. Could any one provide more information on...
I have a job site where debonding of concrete occured on a concrete pier. The concrete was poured 7 months back. recently a big visible shear crack occured. Two photos are attached. I am not sure why this happen? Is any one can provide causes for debonding of the concrete and recommendation to...
A slab was poured in July 2012 on granular A materials. The granular 'A' materials was compacted to a 98%. The saw joints were placed at a distance of 10' 6". The average measured thickness of the slab was 6". Approximately after 8 months of the pour the cracks appeared on the concrete slab. The...
Hi all,
I am involved in pumping station project and during concrete pour for slab on grade for reservoir we cast set of prisms to test Linear Shrinkage. I received test results from testing company. The test results show shrinkage around 0.044, which is slightly over the specified limit in the...
At one of our project contractor wants to use 2% Krystol Internal Membrane (KIM)as an admixture for water proofing purposes. The information for product is uploaded. I never came across using this type of product. Is there someone who knows anything about such products and its suitability to use...
Is some one know any NDT method to test Grout strength for masonry? I am looking to find some economical option to test. The grout was never tested at the time of construction
Thanks to all
I had a test report from testing company, which show lower strength of cylinder at seven days and more than specified strength at 28 days. The reason specified by testing company for lower strength at 7 days was frozen cylinder during initial curing. Is it possible for concrete to gain strength...
I have some crack issue on site. The concrete was poured between June and September 2009. The concrete used was 40 MPa concrete, the slump measured was 40mm and 50mm at the time of pour. The concrete cylinders strength results were ranging between 35 to 60 MPa. The slab poured at 45 angle for...
The test results for concrete cylinders for 35 MPa and 60 MPa show strength gain more than 100% at 7 days break. Any one can focus on the issue what factors can cause concrete cylinders to gain more than specified strength at earlier than 28 days age. Is there any testing issue?
The lab is...
I have a restoration project of old brick building, in order to evaluate existing condition of the structure we took out some brick samples from the structure. I recommended to test for compressive strength of bricks. is there any other tests required to carry on brick sample to know durability...
I have one project for addition and alteration. The project require to place concrete on top of old concrete. The existing structure was approximately built in 1937. The concrete wall placed has no reinforcement. I tried to take cores from existing structure to check comprssive strength. During...
I would like to get some information about testing concrete for AVC. There is no test data provided by concrete supplier with submitted mix design. Is there any test method I can ask supplier for trial batch and test concrete for AVC as per ASTM C457? Any special requirement for minimum quantity...
Does anyone can explain type of fracture of concrete cylinders and relationship of testing procedure. Which fracture type related to correct test procedure and which fracture is not?Thanks to all in advance
One of Testing lab test concrete cylinders 1 at 7, 1 at 28, and 1 at 56, The cylinder tested at 28 days achieved strength less than specified. Lab hold third cylinder for 56 days, 56 days test result passed as per ASTM and CSA international minimum 2 cylinders required to be tested at 28 days...
