Mohammad Nadeem Akhtar

24 Questions 106 Answers 0 Followers

Questions related from Mohammad Nadeem Akhtar

Is the silica fume incorporation in plain concrete help to develop ductility?

The typical failure modes of cylindrical samples in splitting tensile strength and beams in flexural strength were observed. It has been found that the sample of the mixes with 100% OPC was split...

10 November 2022 5,182 4 View

What is the reason for getting more increment in recycled aggregates concrete at 182 and 360 days?

I tested my compressive strength samples at 3, 7, 28, 56,91, 182, and 360 days for standard concrete and recycled aggregates concrete. Up to 56 days, standard concrete samples behave better than...

09 February 2022 2,202 7 View

What is the effect of high Chloride and Sulphate in the sand on the strength of concrete?

Scientific discussion

10 December 2021 9,522 10 View

For freeze-thaw cycle testing of newly design mix concrete, which sample is more appropriate 28, 56, 91, and 182 days curing?

Need expert suggestions

07 September 2021 7,668 8 View

How to convert displacement into strain for splitting tensile strength test results?

We did a splitting tensile strength test on our design mix concrete and our instrument, giving us results in load vs displacement. We can find out stress by the analysis given by ASTM...

01 September 2021 3,306 4 View

There is any positive effect of SCM’s such as Silica fume and flyash, on mechanical properties on concrete at Elevated Temperature?

Need expert discussion

09 August 2021 3,994 11 View

What are the effects of polyethylene terephthalate (PET) waste on the compressive strength of concrete?

In some studies, the utilization of PET waste reported a reduction in compressive strength up to 30-40%; in this case, practically PET waste is not an appropriate waste material in concrete

06 August 2021 112 13 View

Is there any possibility that 56 and 91 days compressive strength is less than 28 days of the same design mix concrete?

In our tested samples of design mix concrete 56 and 91 days, compressive strength was found less than 28 days result. It may be an instrumental error or any other factor. Need expert discussion on...

04 August 2021 2,652 31 View

For long-term durability analysis, which is the best supplementary cementitious materials for replacing OPC in concrete flyash or silica fume?

For durability purposes which one is best to replace OPC in concrete flyash or silica fume

27 July 2021 8,943 20 View

Can anyone tell me how to convert displacement into strain for splitting tensile strength test results?

We did a splitting tensile strength test on our design mix concrete and our instrument giving us results in load vs displacement from load we can find out stress by the analysis given by ASTM...

15 July 2021 577 1 View

What are the effect of silica fume on compressive strength and splitting tensile strength of concrete?

We tested the samples of sustainable concrete with partial replacement of OPC by silica fume and found an excellent effect on compressive strength increment and slight increment in STS

07 July 2021 4,681 27 View

For the standard deviation of design mix concrete, how many samples are required for each mix if using different design mixes at different ages?

We are working on the strength characteristics for the new design mix concrete at 3, 7, 28, 56, 91, and 360 days. To know the actual compressive behavior, each design mix concrete at different...

24 June 2021 7,649 7 View

What is the maximum temperature of testing concrete at elevated temperatures?

We are testing the durability characteristics of novel design mix concrete. For durability characteristics of concrete at elevated temperature is our next target. We have gone through the past...

15 June 2021 8,942 15 View

Which one is the most important durability analysis for newly design mix concrete?

Discussion please

09 June 2021 10,017 17 View

There is any standard for the performance of concrete or mortar under crushed ice water?

For the performance of concrete and mortar in crushed ice and ice cooling water,,, kindly suggest standard code if anyone regarding this performance

20 May 2021 8,968 9 View

Can anyone suggest the right instrument for the Rapid Freeze-Thaw Cycle test?

We need to buy the Rapid Freeze-Thaw Cabinet for our LAB, which is used to measure the resistance of concrete to deterioration caused by repeated cycles of freezing and thawing in water. Kindly...

05 May 2021 8,080 3 View

What is the standard specification of cement sand mortar for masonry and plastering work?

We are trying to develop sustainable cement sand mortar incorporating fine waste materials. To know the actual comparison of prepared and reference samples. What is the standard criterion??

03 May 2021 3,216 6 View

What are the other critical parameters for the concrete strength other than compressive strength?

We are trying to develop sustainable, cost-effective concrete; as far as concern, the compressive strength we reached required strength. What is the other critical parameter for replacing the...

27 April 2021 842 32 View

What is the standard size of mould for the tensile strength of concrete?

To maintain the same bach of materials throughout the project work, we use 150 mm diameter and 300 mm height cylinders. Is it allowable by the standards if we will use the same sample size for...

22 April 2021 651 13 View

Which one is the Standard Test Method for Resistance of Concrete to Rapid Freezing and Thawing?

Kindly suggest a standard test method of Freezing and Thawing for concrete and the instrument specification for the freeze-thaw cycle

20 April 2021 1,594 7 View

What is allowable individual variation in the concrete cylinder's compressive strength, i.e., if 3 samples of each mix are taking as per ACI standard?

I am testing my project samples for different design mixes, i.e., 3 samples of each mix. One sample from each mix gives very high strength compared to the other 2; all precautions were taken while...

05 April 2021 1,906 13 View

Which one is the best technique to determine the leaching effect of composite materials?

We are trying to add nanoparticle power waste material in sustainable concrete, so we want to see any leaching effect of this material. Need suggestions and discussion from experts.

01 April 2021 7,865 15 View

How can I calculate the porosity of composite material?

Doing experiment on different materials mixed with fly ash e.g sand, coarse sand, stone dust, river bed materials, and cement. I want to calculate the porosity of composite material.

07 June 2014 6,509 22 View

How can I calculate experimental error?

I have experimental data and need to write the experimental error.

20 March 2014 9,433 16 View