HW1- It is required to design a M20 grade concrete mix having a slump of the order of 25 mm for foundation of structure likely to be subjected to moderate exposure conditions during its service life. The contractor will exercise good quality control, and standard deviation estimated from past records is 4.8 MPa (for more than 30 samples). Test results of the material available at the site are the following: Coarse Aggregate: Round gravel aggregate; specific gravity =2.68; water absorption =1.46; bulk density kg/m³ (dry and compacted) 1600. Fine Aggregate: natural river sand; specific gravity = 2.6; water absorption= 0.5; Durability requirements: Maximum allowable w/c ratio= 0.55Minimum cement content for moderate exposure= 300 kg/m³. Sieve size (mm) Cumulative % passing Sieve size (mm) Cumulative % passing Sieve analysis of sand 4.75 2.36 95.4 90.6 0.15 1.18 0.6 0.3 82.2 54.4 26.6 2.9 Sieve analysis of coarse aggregate 20 95 40 100 10 25.6 4.75 3.3 2.36 0 pan 0 pan 2 Estimate the quantity of materials for 30 m³ of concrete and the required adjustment to mix proportion if the free surface moisture of sand is 1.4 and for coarse aggregate is zero.

HW1- It is required to design a M20 grade concrete mix having a slump of the order of 25 mm for foundation of structure likely to be subjected to moderate exposure conditions during its service life. The contractor will exercise good quality control, and standard deviation estimated from past records is 4.8 MPa (for more than 30 samples). Test results of the material available at the site are the following: Coarse Aggregate: Round gravel aggregate; specific gravity =2.68; water absorption =1.46; bulk density kg/m³ (dry and compacted) 1600. Fine Aggregate: natural river sand; specific gravity = 2.6; water absorption= 0.5; Durability requirements: Maximum allowable w/c ratio= 0.55Minimum cement content for moderate exposure= 300 kg/m³. Sieve size (mm) Cumulative % passing Sieve size (mm) Cumulative % passing Sieve analysis of sand 4.75 2.36 95.4 90.6 0.15 1.18 0.6 0.3 82.2 54.4 26.6 2.9 Sieve analysis of coarse aggregate 20 95 40 100 10 25.6 4.75 3.3 2.36 0 pan 0 pan 2 Estimate the quantity of materials for 30 m³ of concrete and the required adjustment to mix proportion if the free surface moisture of sand is 1.4 and for coarse aggregate is zero.

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

Q2:-From the sieve analysis (grading test), the following results are obtained: Sieve size, ASTM ‘Weight of aggregate retained on each sieve (gm) 1% inch 0 3/4 inch [ 840 3/8 inch [ 2100 No.d [ 560 No.8 | 286.8 No.16 [ 360 No.30 3272 No.50 358 No.100 [46 Pan ‘ 22 Calculate the followings: 1-Fineness modulus of the aggregate. 2-Average sieve size. 3-Maximum aggregate size. 4- Minimum cement content (Cos)
The following separate sample of fine and coarse aggregates were submitted for sieve analysis in accordance with ASTM C136. Complete the tables below. Tell whether the samples satisfied the grading requirements of ASTM C33 or not in the remarks
What if the value of specific gravity of cement in a test is grater than the standard value of 3.15? My value is 3.37. Can it be used for mix design? As a material engineer, does the result of the test is acceptable or not? Why
Given the data in Table , select the blend and the design binder content for a Superpave design aggregate structure for a 5 million ESAL and a 19 mm nominal maximum aggregate
Table 1 shows the sieve analysis of a 900-g fine aggregate samples. (c) Identify which aggregate is (i) open graded (ii) gap graded and (iii) dense graded. Justify your answer.
A contractor needs 403 m3 of aggregate material for a highway construction project. The required dryunit weight of the compacted fill is 20.82 kN/m3. The aggregate material is available at a local supplyyard and is sold by measuring in tons and not by volume. The moisture content of the stock is 7%. Thecost of the aggregate material per ton is 60.B.1.1 Determine the amount of water present in the aggregate stock of the local supplyyard.B.1.2 Determine the amount of aggregate material the contractor should purchase in tonsto have exactly the correct volume of compacted material.B.1.3 Estimate the total cost the contractor has to bear for the purchase of the material.
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?
Observation and analysis for sieve analysis of fine aggregate (ASTM C136). What is the conclusion for this?
Explain the codal Procedure of determining the Compaction factor of concrete. Determine the the compaction factor and its degree of workability for concrete mix whose mass in partially and fully compacted state is 11.550 kg and 14.150 kg respectively.
Use the list below of design requirements/assumptions to come up with the concrete mix design: - A slump of 10mm to 30mm.- A characteristic 28-day compressive strength of 30 N/mm2 (5% failures permitted).- The standard deviation of the tests is σ = 6.1 N/mm².- Ordinary Portland cement (42.5 N).- Crushed sand of 2.7 density and 60% passing through a 600 µm sieve.- Crushed coarse aggregate 2.6 density and 20mm are used
1.Calculate for the aggregate impact value given the total weight of aggregates to be 2698 gramsand 45 % of the total weight passed through the 2.36mm sieve and write the nature of thecalculated impact value. 2.An aggregate sample has undergo sieve analysis test. Given the total mass of 1590 grams, theweight of aggregate sample retained on 1.7mm sieve size is 457 grams. Calculate for the abrasionvalue of aggregates. 3.A concrete cylindrical sample has undergone compressive strength test. Given the cross-sectionalfaces of the cylinder each measure 6 inches across, and the cylinder failed at 57,634 pounds of force. What is the compressive strength of that sample of concrete? Please express your answer in N/mm
Design a concrete mix for the following performances and ingredients:• Characteristic compressive strength 50 N/mm2 at 7 days• Defective rate 1 %• Previous control data: standard deviation 5 N/mm2• Cement: class 52.5• Slump required, 30-60 mm• Maximum cement content 550 kg/m3• Coarse aggregate: Crushed single sized 10 mm• Fine aggregate: Uncrushed with 45% passing 600 μm sieve• Relative density of aggregate : 2.7 (assumed)• Volume of trial mix : 0.08 m3Note: the constant k used to find the margin, which is in turn used to determine the target compressive strength is as shown the table below: k for 10 % defectives = 1.28 k for 5% defectives = 1.64 k for 2.5% defectives= 1.96 k for 1% defectives= 2.33