After placement, the temperature of the concrete was measured and recorded by thermal sensors during the first 7 days. The temperature change with time is given in the figure below. If the datum temperature of the concrete mix is known to be -5°C. calculate the maturity of concrete at the end of 7 days using Nurse-Saul equation?

After placement, the temperature of the concrete was measured and recorded by thermal sensors during the first 7 days. The temperature change with time is given in the figure below. If the datum temperature of the concrete mix is known to be -5°C. calculate the maturity of concrete at the end of 7 days using Nurse-Saul equation?

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

After placement, the temperature of the concrete was measured and recorded by thermal sensors during the first 7 days. The temperature change with time is given in the figure below and the datum temperature of the concrete mix is known to be -5°C. If formworks are planned to be removed when 70% of maturity of the laboratory samples cured at 20 °C for 7 days is reached, what is the formwork removal time? temperature (°C) 30 28 26 mm O d. 24 O e 22 20 18 16 14 12 10 OaEarlier than 3.5 days 0 12 24 36 Ob Between 40 to 45 days OF Between 4.5 to 5 days Between 3.5 to 4 days Later that 5 days 48 60 72 84 96 108 120 132 144 156 168 age (hour)
After placement, the temperature of the concrete is measured and recorded by thermal sensors during the first 14 days. The temperature change with time is given in the figure. Temperature (°C) 25 20 15 10 5 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Age (days) If the datum temperature of the concrete mix is known to be - 5°C, calculate the maturity of concrete (in day°C) at the end of 14 days using the Nurse-Saul equation.
Calculate the maturity index of a concrete mixture of which datum temperature is -2.5 °C, when it is cured at laboratory for 28 days at 23 °C. O a. 714 °C-day O b. 575 °C-day O C. 644 °C-day O d. 700 °C-day O e. 1344 °C-day
Ultrasonic pulse velocity (UPV) test in through transmission is applied on a concrete sample. If the travel path is 12 cm and transit time is 24 us, what is the UPV of this concrete sample? Comment on the quality of the concrete? O a. 2000 m/s, weak O b. 200 m/s, very weak O c. 5000 m/s, very good O d. 500 m/s, very weak O e. 3500 m/s, questionable
In a ready-mix plant, cylindrical samples are prepared and tested periodically to detect any mix problem and to ensure that the compressive strength is higher than the lower specification limit. The minimum target value was set at 5,000 psi. The compressive strength data shown in Table were collected. a. Calculate the mean, standard deviation, and the coefficient of variation of the data. b. Using a spreadsheet program, create a control chart for these data showing the lower specification limit. Is the plant production meeting the specification requirement? If not, comment on possible reasons. Comment on the data scatter.
7. A sample of fine aggregate weighs 544 g when SSD and 530 g when OD. The flask weighs 654 g when filled with water and 985 g when filled with fine aggregate and water. Calculate the bulk specific gravity, apparent specific gravity, and absorption.
The strength of a sample of fully matured concrete is found to be 50 MPa. Find the strength of identical concrete at the age of 7 days when cured at an average temperature of 25°C during day time and 15°C during the night time. Take constants A and B as 32 and 54 respectively. These are the Plowman's Coefficients for Maturity Equation.
Ultrasonic pulse velocity (UPV) test in through transmission is applied on a concrete sample. If the travel path is 15 cm and transit time is 48 us, what is the UPV of this concrete sample? Comment on the quality of the concrete. a. 1550 m/s, very weak 2000 m/s, weak 3450 m/s, questionable O b. O C. O d. 5000 m/s, very good O e. 3125 m/s, questionable
The weights of ingredients for producing 1 m³ of concrete as obtained from mix design calculations is given in the below table. The temperatures of ingredients are also shown in the same table. kg/m³ 350 160 Ingredient Cement Water Coarse Aggregate (SSD) Fine Aggregate (SSD) 1250 610 Temperature (°C) 40 30 30 35 If the absorption capacities of coarse and fine aggregates are 2 % and 2.5 % respectively, to which temperature water should be cooled down in order to obtain 1 m³ of 28 °C?
SECTION A Answer ALL Questions Physical and mechanical properties of civil engineering materials, their behaviour and characteristics in design and construction works. Answer below questions using your own words and understanding. (a) (i) Design a concrete mix for the following given data: A mean 28-day compressive strength (measured on standard cubes) of 45 MPa Slump = 40 mm, Uncrushed aggregate with maximum size of 20 mm Specific gravity of aggregate = 2.64 Fine aggregate passes through the 600 µm sieve = 48% No air entrainment required, ordinary Portland cement to be used. [Use supplied charts and table to get required values]
10. A sample of coarse aggregate weighs 1072 g when oven- dried, 1091 g when saturated surface-dried, and 667.6 g when submerged. Calculate the bulk specific gravity, apparent specific gravity, and absorption.
1.40 In a ready-mix plant, cylindrical samples are prepared and tested periodically to detect any mix problem and to ensure that the compressive strength is higher than the lower specification limit. The minimum target value was set at 5,000 psi. The following compressive strength data were collected. Compressive Strength (psi) Compressive Strength (psi) Sample No. Sample No. 1 5595 11 6695 2 5139 12 5449 6359 13 5278 4 5192 14 6697 5 5188 15 5195 6. 5241 16 6021 7 5964 17 5320 5875 18 5657 6155 19 6595 10 5115 20 5235 a. Calculate the mean, standard deviation, and the coefficient of variation of the data. b. Using a spreadsheet program, create a control chart for these data showing the target value and the lower specification limit. Is the plant production meeting the specification requirement? If not, comment on possible rea- sons. Comment on the data scatter.