Three 100*200 mm cylindrical concrete specimens were tested for 28 days compressive strength and show 30.5 MPa, 29.6 MPa and 32.8 MPa compressive strength a) What is the average compressive strength of this concrete? b) What is the approximate tensile strength of this concrete? c) What is the approximate modulus of elasticity of this concrete? For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac). IUS Paragraph Arial 10pt A v Is x? X2 RBC V - 田田用困 <> Ť () +]

Three 100*200 mm cylindrical concrete specimens were tested for 28 days compressive strength and show 30.5 MPa, 29.6 MPa and 32.8 MPa compressive strength a) What is the average compressive strength of this concrete? b) What is the approximate tensile strength of this concrete? c) What is the approximate modulus of elasticity of this concrete? For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac). IUS Paragraph Arial 10pt A v Is x? X2 RBC V - 田田用困 <> Ť () +]

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Types of Concrete

Concrete is the fundamental material used in civil engineering such as building materials for building structures. Concrete is an aggregate mixture of cement, sand, and fine and coarse rock pieces. The cement acts as a binding material that holds the compositions together, sets, and hardens with time. Apart from cement, there are other different types of binding materials used, such as lime concrete, bitumen, asphalt, and so on.

Question

Three 100*200 mm cylindrical concrete specimens were tested for 28 days compressive strength and show 30.5 MPa, 29.6 MPa and 32.8 MPa compressive strength.
a) What is the average compressive strength of this concrete?
b) What is the approximate tensile strength of this concrete?
c) What is the approximate modulus of elasticity of this concrete?
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Objective Questions : Answer the following question briefly. 1. How do you test flexural strength ? 2. How do you conduct the flexural strength of concrete ? Show a sketch. 3. What are the factors affecting flexural tests? 4. What is the importance of flexural strength in concrete? 5. What does the higher flexural modulus mean ? 6. How do you calculate the flexural strength of concrete?. 7. Why is flexure test two point loading.?
2. You are an inspector on a job site, inspecting strength tests from a job with a design strength of 4500 psi. A total of 12 tests were performed on concrete from this job; the strength test results (in psi) are shown below. 4520 4840 4190 4960 4720 4890 4620 4290 4390 4680 4550 4620 Is this concrete acceptable?
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Three 150 mm * 300 mm concrete cylinders with water to cement ratios of0.4, 0.6, and 0.8, respectively. After curing for 28 days, the specimens weresubjected to increments of compressive loads until failure. The load versusdeformation results were as shown in Table P7.26. Assuming that the gauge length is the whole specimen height, it is required todo the following:a. The compressive stresses and strains for each specimen at each loadincrement.b. Plot stresses versus strains for all specimens on one graph.c. The ultimate strength for each specimen.d. The modulus of elasticity as the secant modulus at 40% of the ultimatestress for each specimen.e. The strain at failure for each specimen.f. The toughness for each specimen.g. Comment on the effect of increasing the water–cement ratio on thefollowing:i. Ultimate strengthii. Modulus of elasticityiii. Ductilityiv. Toughness. Curves may be approximated with a series of straight lines.
Concrete is required for a column that will be Severe Exposure to freezing and thawing. The cross section of the column is 300 × 300 mm. The smallest spacing between reinforcing steel is 40 mm. The specified compressive strength of concrete at 28 days is 40 MPa with a slump of 25 to 50 mm. The properties of materials are as follows: (a) Cement used is type I Portland cement with a specific gravity of 3.10. (b) The available coarse aggregate has a maximum size of 23 mm, a dry-rodded unit weight of 1800 kg/m3, a bulk specific gravity (SSD) of 2.68, absorption capacity of 0.65%, and moisture content (SSD) of 0.27%. (c) The fine aggregate has a bulk specific gravity (SSD) of 2.75, absorption capacity of 1.5%, a moisture content (SSD) of 2.5%, and a fineness modulus of 2.7,The aggregates conform to the ASTM C33-84 requirements for grading.
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2. What is the standard size of PCC specimens to be tested for compressive strength? If a smaller size is used, which size is expected to provide higher compressive strengths? Why? Which size provides strengths close to that of an actual concrete structure? 3. What is the purpose of performing the flexure test on concrete? How are the results of this test related to the compressive strength test results? 4. What are the advantages of using a third-point loading flexure test over a center-point loading flexure test? Draw a shear force diagram and a bending moment diagram for each case to support your answer.