CE337 Spring 24 - Sample Lab Report

The following plot belongs to a concrete slab and is intended to determine the formwork removal time. Formworks are planned to be removed when 60% of maturity of the laboratory samples cured at 20 °C for 7 days is reached. Determine the formwork removal time (in days) if the datum temperature is -5°C. 25 Temperature (°C) 20 15 10 5 01 2 3 4 5 6 7 8 Age (days) 9 10 11 12 13 14

Answer carefully the following questions : 1-What is the effect on physical properties of cement, if thel- residue of cement on B.S 90 micron sieve is greater than 10% for OPC? 2-State the meaning of normal consistency of cement. 3-What is the range of values of standard consistency of cement? 4-How the consistency of cement paste is measured? 5-State the significance of initial setting time and final setting time of cement. 6-What is the range value of compressive strength for normal concrete 7 days and 28 days? 7-What is the effect of aggregate grading on the properties of concrete? 8-Describe kinds of slump of fresh concrete with sketch. 9-What is the approximate value of Flexural strength if we have 25 MPa for compressive strength? 10-What is the approximate value of split tensile strength if we have 25 MPa for compressive strength?

Three samples of fine aggregate have the properties shown below. Determine in percentage: (a) total moisture content and (b) free moisture content for each sample and the average of the three samples. Table P5.7 Measure Wet Mass (g) Dry Mass (g) Absorption (%) Sample A 521.0 491.6 2.5 B 522.4 491.7 2.4 C 523.4 492.1 2.3

Water Cement Ratio (W/C) of a sample used for concrete mixes was tested and the results were as follows. Compute the median value? 0.55 0.65 0.65 0.65 0.62 0.45 0.60 0.35 0.40 0.42 0.54 0.54 0.55 O 0.57 0.60

Q3- In cement setting time experiment, the time versus penetration of the cement paste are shown in Table Q3. Determine: i- Cement initial set time. ii- Give the dimensions and shape of the cement paste mold. iii- What is the depth of the needle tip to the bottom of the mold at the time of 30 min? Table Q3 Time, min Initial reading Final reading 15 30 45 | 60 75 38 40 40 38 39 13 16 25 35

Three samples of fine aggregate have the properties shown in Table P5.9. TABLE P5.9 Sample Measure A B Wet Mass (g) 521.0 522.4 523.4 Dry Mass (g) 491.6 491.7 492.1 Absorption (%) 2.5 2.4 2.3 Determine in percentage: (a) total moisture content and (b) free moisture content for each sample and the average of the three samples.

25. M20 concrete is a grade of concrete which has a compressive strength equal to 20 MPa. I want to test if concrete with a raction of cement partially replaced with fly ash would be competftive with M20 concrete. What test should I perform given limited time and resources? O A. One sample t-test O B. One sample z-test O C. Two sample t-test D. Two sample z-test

ANALYTIC APPROACH IN CEMENT The percent fineness of cement is 11.26% after conducting the experiment. What is the original weight of the sample if the weight loss is 78 grams during the experiment and its mass passed through sieve 200 is 197 grams? Complete the answers that needed in the worksheet provided.

Q2) Answer the followings: i-Why is cool clinker interground with gypsum in manufacture of Portland cement? 2- Under what conditions would you recommend the use of rapid hardening cement? 3- What are the factors governing the desired aggregate grading? 4-What are the required properties of fresh concrete? 5-Why is compaction necessary to concrete? 6-Explain effect of sea water on concrete. 7-What happened when adding water to the concrete at the jobsite? & How can the progress of hydration of cement be determined?

Q1). Answer the followings: -What are the major compounds in Portland cement? 2-The rate of hydration decreases continuously with time, why? 3-How can the progress of hydration of cement be determined? 4- List and explain factors that affecting the setting of Portland cement. 5- What is relationship between aggregate surface texture and concrete strength? 6- What are the factors governing the selection of maximum aggregate size? 7-List and explain factors that affecting the workability of fresh concrete. 8- What are the most effective means in reducing concrete bleeding? 9- What are the difficulties in hot weather concreting? 10-What is the purpose of trial mixes in a mix design of concrete?

Following is the given data of compressive strength test done on 2 inch cement mortar cubes: w/c Cube Maximum Load (lb) 17640 18270 17890 16350 16740 15990 14870 15260 15790 Ratio No. 0.50 0.55 2 0.60 Determine: a) Compressive strength of each cube. b) Average compressive strength for each mix. 312m

Problem 1: Answer the following question briefly: 1) Why is it important to follow standard tests exactly when testing Portland cement? 2) Is quartz rich with silica? Why it is not suitable raw material for cement production? 3) What is meant by the conversion of HAC? What are the consequences of the conversion of HAC? 4) Why the amount of gypsum added to clinker should be carefully controlled? 5) Compare the contributions of C,S and C,S to the strength of concrete? 6) What is the difference between false set and flash set? Problem 2: Assign each of the following cements to one of the ASTM Types I to V: 1) C,S = 26%, C,S = 52%, C,A = 5%, C,AF = 13%, Fineness 300 m?/Kg. 2) C,S = 56%, C,S = 22%, C,A = 9%, C,AF = 8%, Fineness 370 m²/Kg. 3) C,S = 63%, C,S = 14%, C,A = 15%, C,AF = 9%, Fineness 550 m?/Kg. 4) C,S = 49%, C,S = 28%, C,A = 7%, C,AF = 13%, Fineness 340 m?/Kg. 5) C,S = 41%, C,S = 37%, C,A = 2%, C,AF = 12%, Fineness 330 m?/Kg. Problem 3: Identify the major cement factories in…

As a design engineer at a batching plant company, you have been asked to design a concrete mix for pre-cast concrete beams with G40. By considering data given: Characteristic strength of concrete, 40 N/mm2 at 28 days Proportion defective, 10% (k=1.28) Standard deviation, 8 N/mm2 Ordinary Portland Cement Slump required, 30-60 mm Maximum crush aggregate, 20 mm Relative density of crushed aggregate (SSD), 2.7 Percentage passing 600 µm, 60% (i) Propose an appropriate design to fulfill the requirement of G40 by using a form in Appendix A.

A sieve analysis test was performed on a sample of coarse aggregate and produced the results in Tablea. Calculate the percent passing through each sieve.b. What is the maximum size?c. What is the nominal maximum size?d. Plot the percent passing versus sieve size on a semilog gradation chart.e. Plot the percent passing versus sieve size on a 0.45 gradation chart.f. Referring to Table (ASTM C33), what is the closest size number anddoes it meet the gradation for that standard size?

solve each consistency and Penetration of 33 to 35mmfrom the top determines the consistency of Portland cement Trial Cement (grams) Water (grams) Penetration (mm) Consistency 1 70 30 38   2 70 25 34   3 70 20 28

A results of sieve analysis test for sample of Aggregate are shown in below Table: Wt Retained (gm) Sieve Size in 3/4" 1/2" 3/8" No.4 mm 19 12.5 64 9.5 111 4.75 156 No.8 2.36 201 No.16 1.18 330 No.30 0.600 266 No.50 0.300 212 No.100 0.150 200 No.200 0.075 98 Pan 75 1. Calculate percent passing through each sieve. 2. What is the maximum size. 3. What is the nominal maximum size. 4. Calculate the Fuller gradation using (n of FHWA) 5. Plot the aggregate gradation in log scale chart and 0.45 power chart

Sieve Analysis of Coarse Aggregates) Another group of students have gathered data for sieve analysis for another aggregate stockpile. Determine the percentages passing of each size and draw the grain size curve. Sieve Size Amount retained, g 1-1/2" 1" 315 782 3/8" No. 4 No. 30 No. 200 1493 677 1046 1502 Pan 45

A materials engineer is working in a research project to evaluate the effect of one type of admixture on the compressive strength of concrete. He tested eight mortar cubes made with admixture and eight others without admixture after 28 days of curing. The compressive strengths of cubes in MPa with and without admixture are shown in Table P6.38. Using the statistical t-test, is there a significant difference between the means of the compressive strengths of the two cement mortars at a level of signifi- cance of 0.10? TABLE P6.38 Compressive Strength, MPa Cube No. With Admixture Without Admixture 1 24.2 24.4 2 25.1 26.0 3 25.6 25.6 4 24.1 25.1 23.5 24.5 25.4 25.1 7 24.4 23.4 24.2 24.5 8.

5 (five) samples / specimens of solid brick units having height = h, length = b, and width = t, compressive load P as shown in Table 1 below. Table 1. Experimental results Length b (cm) Compressive load P Width t Height h (cm) Sample (cm) (ton-f) 1 11 11.1 11.3 14.98 2 11.3 11.3 11.2 15.52 3 11.4 11.2 11.3 15.85 4 11 11.3 11 11.1 14.91 5 11.2 11.2 14.79 If the compressive strength is the average P divided by the cross-sectional area of the compressed sample, calculate the average compressive strength f»r' in MPa of the brick (show your calculations). 1 ton-force =10 kN. P h

A materials engineer is working in a research project to evaluate the effect of one type of admixture on the compressive strength of concrete. He tested eight mortar cubes made with admixture and eight others without admixture after 28 days of curing. The compressive strengths of cubes in MPa with and without admixture are shown in Table P6.38. Using the statistical t-test, is there a significant difference between the means of the compressive strengths of the two cement mortars at a level of signifi- cance of 0.10?

A concrete mix consists of 5 gallons of water for each bag of cement. What is the expected compressive strength of this mix based on the compressive strength curve shown here? Given information: Weight of US standard cement bag = 94 lbs Water weight = 8.34 pounds per gallon COMPRESSIVE STRENGTH psi 6000 5000 4000 3000 2000 0.3 0.4 6000 psi 5000 psi 4000 psi 3000 psi NORMAL CONCRETE 0.5 0.6 W/C RATIO 0.7 MPa 42 35 28 21 14 0.8

In a shape test of aggregate, which one the following gives the correct slot for flakiness index for a material passing 50 mm sieve and retained on 40 mm sieve?

The table below presents the results of the sieve analysis conducted on a sample of aggregate. Given the bulk specific gravities of 2.65 for coarse aggregate, 2.69 for fine aggregate, and 2.73 for filler, determine the bulk density of the aggregate sample. Additionally, calculate the maximum aggregate size and nominal aggregate maximum size. Sieve size (mm) 37.5 % Passing 100 Specification limit 25 92 100 90-100 19 83 76-90 12.5 9.5 4.75 2.36 0.3 71 62 53 32 15 56-80 48-74 29-59 19-45 5-17 0.075 4 2-8

2. In a ready-mix concrete 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. Sample No. 1 2 3 4 5 6 7 8 9 10 Compressive strength (psi) 5595 5139 6359 5192 5188 5241 5964 5875 6155 5115 Sample No. 11 12 13 14 15 16 17 18 19 20 Compressive strength (psi) 6695 5449 5278 6697 5195 6021 5320 5657 6595 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 reasons. Comment on the data scatter.

A sieve analysis test was performed on a sample of coarse aggregate used in a concrete mix design and the resulting mass retained per sieve is shown in the table below. Sieve Size 3 in. 2 in. 1.5 in. 1 in. ¾ in. ½ in. 3/8 in. No. 4 Pan Amount Retained (lb) 0 2.2 3.7 15.9 12.0 13.5 26.7 10.1 1.3 a) What is the "maximum" size of the aggregate? b) What is the "nominal maximum" size of the aggregate? c) Complete the table below and plot the Grain Size Distribution curve on a semi-log scale. (either use the plot provided on the next page, or recreate your on using excel)

Q1: A: define the following: Steel corrosion, seasoning, fly ash, flash point, grout B: A severe weathering clay brick was tested for absorption and saturation coefficient according to ASTM C67 procedure and produced the following data: Dry mass of specimen = 2.186 kg Saturated mass after 24-hr submersion in cold water = 2.453 kg Saturated mass after 5-hr submersion in boiling water = 2.472 kg Calculate absorption by 24-hr submersion, absorption by 5-hr boiling, and saturation coefficient. Does the brick satisfy the ASTM requirements?

The specific gravity and absorption test (ASTM C128) was performed on fine aggregate and the following data were obtained: Mass of SSD sand 500.0 g Mass of pycnometer with water only = 623.0 g Mass of pycnometer with sand and water = 938.2 g 495.5 g Mass of dry sand Calculate the specific gravity values (dry bulk, SSD, and apparent) and the absorption of the fine aggregate.

8. What is the maximum allowable limit of Materials Finer Than 75 Mm (No. 200) Sieve in Coarse Aggregates in % according ASTM C33? 9. What is the maximum allowable limit (in %) of clay lumps and friable particles in fine and coarse aggregates? 10. What is the maximum allowable limit of loss (in %) of a coarse aggregate sample tested for abrasion and impact in the Los Angeles Abrasion Machine?

6. A sample of lightweight coarse aggregate weighs 532.3 g when oven-dried, 615.7 g when saturated surface-dried, and 191.3 g when submerged. Calculate the bulk specific gravity, apparent specific gravity, and percent absorption.

MAKE A CONCLUSION ABOUT THE EXPERIMENT MOISTURE CONTENT OF AGGREGATES

Three samples of aggregates were taken weighed in moist and dry condition. Moist Dry Unit Absorption Volume (m3) Unit Aggregate Wt. Wt. (%) (kN/m3) (kN/m3) Sample 1 23.425 20.018 5.14 0.366 Sample 2 22.7 18.757 3.87 0.695 Sample 3 20.292 18.387 2.62 0.237 Where; Unit weight of water = 9.81 kN/m3 %3D Determine the average free moisture content of the three samples.

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2. A sample of fine aggregate weighs 501.2 g when SSD and 491.6 g when OD. The flask weighs 540.6 g when filled with water and 843.1 g when filled with the aggregate sample and water. Calculate the bulk specific gravity, apparent specific gravity and percent absorption.

Working on major construction project that requires considerable amounts of concrete to be used,you are asked to design a concrete mix following the BRE methodology. All the necessary tables forthis can be found in the Appendix. The concrete mix specifications are:o Characteristic compressive strength of 35 N/mm 2 at 28 days.o Failure rate of 2%o Previous control data yielded a standard deviation of 10 N/mm 2o CEM-I 42.5o Air-entraining is not requiredo Maximum water to cement ratio 0.40o Minimum cement content 390 kg/m 3o Required slump 50 mmo Coarse aggregate: Crushed maximum size 20mmo Fine aggregate: Uncrushed with 90% passing 600 μm sieveo Relative density of aggregates: 2.5o Coarse aggregate has 4% moistureo Fine aggregate is dry and has 1.2% absorption.o Volume of the required trial mix: 0.090 m 3Following the BRE step-by-step process estimate the water content of the mix estimate the content of aggregates, provide the estimated mix quantities