Answered: y the advantage of a "road mix"

Engineering

Civil Engineering

y the advantage of a "road mix"

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter20: Design Of Rigid Pavements

Section: Chapter Questions

Problem 1P: Portland cement concrete consists of what four primary elements?

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IN YOUR VERY OWN UNDERSTANDING/WORDS, discuss briefly the advantage of a "road mix" over the "plant mix" concrete.

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Why we need to know the Properties of Fine Aggregate and how it is important for concrete
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Give any two examples of samples of different types of aggregates and note the different shapes,textures and sizes. Discuss how each type might affect the concrete mixture.
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What are the typical deleterious substances in aggregates that affect portlandcement concrete? Discuss these effects.
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Q. Using the British methods, design a concrete mix to bear an average compressive strength of 35 MPa at 28 days, to cast a room slab with the following dimensions (5 width x 4 length x 0.2 depth m) and 200 mm space distance of reinforcement. Consider the following properties: o Cement used is type I Portland cement ® Required slump = 30 — 60 mm o Coarse aggregate: ® Crushed rocks * Maximum size of 40 mm, e The fine aggregate: * Crushed rocks = Falls in zone 3 o Assume zone A for figure 1 o AssumeK = 1.64
Given the four concrete mixes as shown in the table below, one without water reducers and three (c1-c3) with water reducer. The most economic mix where the workability and compressive strength maintained as for the original mix (the mix without water reducers) is With water Reducer Without water Reducer C1 C2 C3 Cement, Kg/m3 850 765 850 850 Water, Kg/m3 465 419 370 465 Slump, mm 50 S1 50 S2 Compressive Strength (MPa) 38 fc1 fc2 fc3 Select one: O A. C3 О В. С2 О С.С1 O D. C1 and C2