Answer question 5.43 5.43 What is alkali-silica reactivity? What kinds of problems are caused by ASR?Mention two ways to minimize ASR.5.44 What are the typical deleterious substances in aggregates that affect portlandcement concrete? Discuss these effects.5.45Review ASTM D75 and summarize the following:a. Sampling aggregates from conveyer belts.b. Sampling aggregates from stockpiles.c. Sampling aggregates from roadway bases and subbases.d. If the nominal maximum aggregate size is 3/4 in., what is the minimumsample size that needs to be obtained?

Answered: 5.43 What is alkali-silica reactivity?…

Fundamentals Of Construction Estimating

4th Edition

ISBN:9781337399395

Author:Pratt, David J.

Publisher:Pratt, David J.

Chapter11: Pricing Concrete Work

Section: Chapter Questions

Problem 4RQ

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Answer question 5.43

5.43 What is alkali-silica reactivity? What kinds of problems are caused by ASR?
Mention two ways to minimize ASR.
5.44 What are the typical deleterious substances in aggregates that affect portland
cement concrete? Discuss these effects.
5.45
Review ASTM D75 and summarize the following:
a. Sampling aggregates from conveyer belts.
b. Sampling aggregates from stockpiles.
c. Sampling aggregates from roadway bases and subbases.
d. If the nominal maximum aggregate size is 3/4 in., what is the minimum
sample size that needs to be obtained?

Expert Solution

Step 1

Alkali Silica Reactivity

Alkali-silica reactivity (ASR) is a chemical reaction that occurs between the alkalis (sodium and potassium) in cement and reactive silica minerals in aggregates used to make concrete. When the reactive silica in aggregates reacts with the alkalis in cement, it can cause the formation of a gel-like substance, which can lead to the expansion and cracking of the concrete over time.

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