Precast concrete

In this paper I will discuss the development of both concrete and the arch, and I will include the importance of each in the life of the Romans and the results of their use. The arch was very important for the Romans. They didn’t invent it, it was used many years before by the Egyptians, and others (The Influence, n.d.), but the Romans greatly improved it. They did this by using their natural talent of finding a solution to difficult problems, by putting a large amount of worker’s efforts into…

As the mother of seven children, Hanna and Max gave the children the responsibility of going to the store at a very early age. The purchases were always very simple such as a loaf of bread and a quart of milk. As a rule, they would spend a penny or two for candy and put the remainder of the change in the grocery bag. This not only enabled them to learn how to shop, but to stretch a dollar as well. On this particular Saturday, Susan and Beth returned home from the store with the usual purchases…

L.B. Agar Lysogeny broth (LB), a nutritionally rich medium, is primarily used for the growth of bacteria. The abbreviation is commonly taken to mean Luria broth, Lennox broth, or Luria-Bertani medium. According to its creator Giuseppe Bertani, the abbreviation LB was actually intended to stand for lysogeny broth (1). The formula of the LB medium was published in 1951 and continues to be the most common media used today (2). There are several common formulas of LB. Although they are different,…

Terrazzo, composites, and concrete are all materials that can be used in the interior of a space. In this paper, I am going to explain the similarities and differences between concrete and terrazzo, what each material is composed of, how these materials are used, and the different subcategories of each material. I’m also going to discuss how each material can be altered, in terms of the look and feel of it. Composite flooring is composed of aggregate and a binder, also known as the matrix. The…

On March 1st, 2016, the CEE 3030 Construction Materials class mixed concrete with varying water cement ratios and created three, 3” diameter by 6” high cylinders and three, 6” diameter by 12” high cylinders. The cylinders were cast according to the ASTM C31 standard. The class was divided into sections, then the sections were divided into teams. The sections mirrored each other, and teams created concrete with 0.40, 0.44, 0.48, and 0.52 water cement ratio. Over the next 28 days the cylinders…

Experimental Study of Strength and Workability of Magnesium Silicate Hydrate Binder System H.M. Tran, A. Scott Abstract—The novel binder system of magnesium silicate hydrate has the advantage of low-CO2 production and potential use for structures and nuclear waste immobilisation. This paper discusses the experimental study to optimize proportions of cement paste and mortar for compressive strength and workability using magnesium silicate hydrate system. Binary systems containing magnesium oxide…

1. The concrete mix proportions for the batch were calculated before the beginning of the lab by a select few group members. Calculations were done with goal of the having the greatest early strength as reasonably possible. To accomplish this, the accelerator agent of calcium chloride was added at a proportion of 2 Ib. of calcium chloride to every 100 Ib. of cementitious material. This ended up being 0.483 Ib. of accelerator. The physical properties, like specific gravity and percent absorption,…

Chapter 1 INTRODUCTION 1.1 Introduction Penang Second Bridge is one of the largest civil engineering projects in Malaysia after the First Penang Bridge. Penang Second Bridge or also known as The Sultan Abdul Halim Muadzam Shah Bridge was a dual carriageway toll bridge in Penang, Malaysia. It was the second bridge which connects the mainland to the island after the first Penang Bridge. Once construction is completed, a maintenance management system plays an important role in maintaining the…

Deploy Energy Efficient Bell & Gossett Series 100 Pumps for Superior Quality & Reliability Bell & Gossett Series 100 pumps are universally deemed as the prominent leader of hot water circulation pumps used for residential purpose. Its 3 piece fully oil lubricated model design protuberantly brands Series 100 as the most rugged and highly dependable machine. The exceptional design of these pumps in tandem with their extremely competent hydraulic performance enables users to sustain quiet noise…

compressive strength properties of the concrete produced by replac-ing 5%, 10% and 15% by weight of ordinary Portland cement with Sawdust Ash (SDA). Slump test was carried out on the fresh concrete and compressive strength test on hardened concrete. The concrete cubes were tested at the ages of 3, 7, 14 & 28 days. The results showed that Sawdust Ash is good with use in cement. The slump decreased as the Sawdust Ash content increased indicating that concrete becomes less workable as the Sawdust…