The density of concrete can be significantly reduced by __________.

Which of the following statements on UHPC is NOT accurate?

Which of the following cannot be considered as an implementation barrier for construction-scale 3D printing (Contour Crafting)?

Construction 3D printing is an automated construction technology based on specially-designed cementitious mixtures and can only be used for on-site construction.

Use the following information to answer Questions 2-19.   Suppose you are leading a team to help H&R Block (a tax preparation company) improve its tax preparation service process. After several field trips to the company, you decided that tax preparation process consists of two activities: (i) preparing necessary documents (DocPrep, hereafter) performed by a team led by Ted, followed by (ii) completing tax return forms (FormPrep, hereafter) performed by a team led by Mary. You built the following model in ExtendSim to simulate this process (also available from Flow chart base model.pdf in case the picture does not show up).   Answer Questions 6-8 also considering the following information   Now you have fully specified the simulation model. You run the simulation with the end time set to 10,000 min and the number of runs set to 1. You obtain the following statistics from the Results tabs in the dialogs of Queue 1 (also available from Queue 1.pdf) and DocPrep (also available from DocPrep.pdf). On average, how long does a new request spend in H&R Block until it is ready for tax form preparation?

Which of the following can result in a lower mechanical strength of 3D printed concrete, versus cast-in-place concrete with the same water-to-cementitious ratio?

Workability of SCC is described in terms of __________.

The fire resistance of hardened cement paste mainly depends on __________.

Use the following information to answer Questions 24-30.   The manager of Wash Me car-wash center has built a simulation model to simulate and analyze the center’s service processes. Based on 10 simulation runs, the manager calculates that the average cycle time has a sample mean of 30 min and a standard deviation of 10 min. Please answer the following questions. Answer Questions 29-30 also considering the following information   The manager is interested in the new system but still doubts its economic benefit considering the high installation and maintenance costs. To see if the new process is more cost-effective, the manager has simulated the existing process and the new process each for 10 times, and obtained the following statistics for the car-wash center’s average profit per day. The manager would like to conduct a proper hypothesis test to see if the new system is better than the old system at 5% significance level.   Mean  Standard Deviation  Existing Process 5,000 50 New Process 5,040 80 The hypothesis test conducted revealed a p_value of 0.1. What decision can you draw from it?

Structural lightweight aggregate concrete has a density value between __________  and a minimum 28-day compressive strength of __________.