1. Concrete is properly vibrated when Oa. Large air bubbles no longer appear at surface b. Vibrator changes pitch or tone O c. Large aggregate blends into surface O d. All of the above Question 2 (Mandatory) (1 point) Listen 2. Construction joints in floors must be located Oa. Within the middle third of spans Ob. Two times the width O c. Wherever possible Od. In accordance with ASTM standards Question 3 (Mandatory) (1 point) Listen 3. When pumping concrete, the maximum size aggregate for an 2" hose is _ O a. 5/8" Ob. 34" Oc. 1 Od. 1.25 Question 4 (Mandatory) (1 point) 1) Listen 4. The correct term to describe the act of depositing and consolidating concrete is Oa. Pouring Ob. Mixing O c. Placing O d. Introduce