Effects Of Aggregate Blends On The Properties Of Portland Cement Concrete Pavements PDF Download
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| Author | : Terry Dossey |
| Publisher | : |
| Total Pages | : 148 |
| Release | : 1994 |
| Genre | : Aggregates (Building materials) |
| ISBN | : |
Download Effects of Aggregate Blends on the Properties of Portland Cement Concrete Pavements Book in PDF, ePub and Kindle
Although recent studies have shown that pavement performance does vary by aggregate type, current portland cement concrete pavement design tools do not fully incorporate aggregate properties into the design process. Aggregate characteristics shown to affect pavement performance include strength, thermal properties, and shrinkage properties. The objective of this study was to investigate the material properties of crushed limestone and siliceous river gravel, two aggregates predominantly used in current pavement construction, and to determine a relationship between the properties of single-aggregate concrete and concrete made with predetermined blends of limestone and gravel. This report continues the work of Project 422/1244, which was limited to single-aggregate concretes. Additional models were developed to predict concrete properties of blended aggregate concrete for use in the design tools, CRCP and JRCP, described in previous 422/1244 reports. A computer program, CHEM2, was developed, which allows the pavement designer to estimate the material properties of concrete from an inexpensive chemical test.
| Author | : |
| Publisher | : |
| Total Pages | : 80 |
| Release | : 2006 |
| Genre | : Pavements, Concrete |
| ISBN | : |
Download Effect of Larger Sized Coarse Aggregates on Mechanical Properties of Portland Cement Concrete Pavements and Structures Book in PDF, ePub and Kindle
ODOT is continually searching for ways to improve the cost efficiency of Portland cement concrete without sacrificing concrete strength and stiffness. Because Portland cement is easily the most costly material used in normal concrete, limiting the amount of cement used is the quickest way to achieve cost effectiveness. In addition, limiting the cement content will also help to prevent dimensional instabilities in concrete such as shrinkage and creep. The use of larger sized coarse aggregates may be useful in limiting cement content, yet larger sized coarse aggregates may also decrease concrete strength by weakening the aggregate-cement paste bond. In many transportation structures, such as pavements, concrete strength is not critical, as dimensional stability, porosity, and durability play a more important role. It is possible, therefore, that larger sized coarse aggregates can reduce the cement content and improve these properties. Laboratory research is needed to determine if larger sized coarse aggregates can improve cement efficiency without reducing concrete strength.
| Author | : Steven M. Cramer |
| Publisher | : |
| Total Pages | : 56 |
| Release | : 1999 |
| Genre | : Aggregates (Building materials) |
| ISBN | : |
Download Effect of Changes in Total Aggregate Gradation on Portland Cement Concrete Properties Book in PDF, ePub and Kindle
| Author | : James Stanley Fergus |
| Publisher | : |
| Total Pages | : 374 |
| Release | : 1980 |
| Genre | : Pavements, Concrete |
| ISBN | : |
Download The Effects of Mix Design on the Design of the Pavement Structure when Utilizing Recycled Portland Cement Concrete as Aggregate Book in PDF, ePub and Kindle
| Author | : Kristina M. Cannady |
| Publisher | : |
| Total Pages | : 75 |
| Release | : 2009 |
| Genre | : |
| ISBN | : |
Download Effect of Larger Sized Coarse Aggregates and Microsilica on Environmental Properties of Portland Cement Concrete Pavements and Structures Book in PDF, ePub and Kindle
This project examines whether the addition of microsilica or the use of aggregates with maximum size above 1.5 in., in concrete mixes prepared by the Ohio Department of Transportation (ODOT) for bridge decks and highway pavements, can have adverse effects on the durability properties of such structures. The behavior of several series of concrete specimens has been monitored over a period exceeding a year, and measurements of shrinkage, creep, abrasion, rapid chloride permeability, and freeze/thaw resistance have been recorded. Such data are evaluated to determine if altering the standard ODOT concrete mix design on either end of the gradation spectrum can indeed lower the cement content and increase its cost effectiveness and efficiency. It was found that different coarse aggregate gradations did not impact significantly the environmental properties of concrete examined. Variability issues related to the testing protocols themselves confounded the differences observed. These results indicate that larger sized coarse aggregates can be used for pavements and highway structures without significantly compromising the environmental properties of the concrete, and afford concrete producers more flexibility in creating cost-effective and cement-efficient mixes. It was found earlier in State Job No. 14800(0) that the compressive and flexural strengths of abused microsilica did not differ much from that of densified microsilica. This conclusion is brought into question, at least in the case of abused microsilica, by the rapid chloride permeability results obtained. Nonetheless, all values obtained are within the limits termed as low or moderate by the prevailing specifications.
| Author | : Michael Berry |
| Publisher | : |
| Total Pages | : 172 |
| Release | : 2013 |
| Genre | : Aggregates (Building materials) |
| ISBN | : |
Download Feasibility of Reclaimed Asphalt Pavement as Aggregate in Portland Cement Concrete Book in PDF, ePub and Kindle
This research effort was focused on evaluating the feasibility of using minimally processed reclaimed asphalt pavement (RAP) as aggregate replacement in concrete pavements. This research demonstrated that concretes with up to 50 percent of the fine aggregates and 100 percent of the coarse aggregates replaced with RAP were suitable for concrete pavement. A statistical experimental design procedure (response surface methodology - RSM) was used to investigate proportioning RAP concrete mixtures to achieve desired performance criteria. Based on the results of the RSM investigation, two concrete mixtures were selected for further evaluation: a high RAP mix with fine and coarse aggregate replacement rates of 50 and 100 percent respectively, and a "high" strength mix with one half of the RAP used in the high RAP mix. Both mixes met MDT concrete pavement specifications for slump (1.5 inches), air content (6 percent), and 28-day compressive and tensile strengths (3,000 psi and 500 psi, respectively). These two concrete mixtures were subjected to a suite of mechanical and durability tests to evaluate their potential use in Montana roadways. Mechanical properties tested were compressive and tensile strength, elastic modulus, shrinkage, and creep. Durability tests included alkali-silica reactivity, absorption, abrasion, chloride permeability, freeze-thaw resistance, and scaling. Overall, both mixes performed adequately in these mechanical and durability tests, although it is important to note that the inclusion of RAP had an obvious negative impact on nearly every property tested relative to those of control mixes made with 100 percent conventional aggregates.
| Author | : Kho Pin Verian |
| Publisher | : |
| Total Pages | : |
| Release | : 2018-04-30 |
| Genre | : |
| ISBN | : 9781622604906 |
Download Investigation of Use of Slag Aggregates and Slag Cements in Concrete Pavements to Reduce the Maintenance Cost Book in PDF, ePub and Kindle
The air-cooled blast furnace slag (ACBFS), the by-product of the pig iron making process, is often used as coarse aggregate in portland cement concrete (PCC) pavements, especially in the areas located in the vicinity of the iron mills. The utilization of this by-product as an aggregate in concrete offers environmental and economic benefits in the form of elimination of waste, decrease in the disposal costs, and reduction in need for mining of the natural materials. However, concerns exist with relation of the influence of these aggregates on the long-term durability of pavement concretes, especially at locations exposed to freezing and thawing environment.The objective of this research was to evaluate the influence of using the ACBFS aggregate (slag aggregate) as a replacement for natural aggregates on the properties of pavement concrete designed to meet the standard specifications of the Indiana Department of Transportation. A total of eight different concrete mixtures, four containing air-cooled blast furnace slag (ACBFS) as coarse aggregate and additional four containing natural dolomite, were used in this study.The mechanical and durability properties of these concretes were assessed by conducting series of tests prior and after the exposure to FT and WD cycles. In addition, changes in the overall physical appearance of the test specimens were also documented to aid in the evaluation of the effects of given exposure conditions on the deterioration process of concretes. In the case of a plain concrete, the analysis of the data collected during the study (i.e. the observed loss of strength, reduction in the dynamic modulus of elasticity, and physical changes in the appearance of the specimens) indicated that the calcium chloride (CaCl2) deicer caused the most severe distress, followed by the magnesium chloride (MgCl2). Specimens exposed to sodium chloride (NaCl) experienced the least damage and performed comparably to those exposed to distilled water (DST).The use of either Class C fly ash, slag cement or the combination of both as part of the binder was found to greatly increase the resistance of concrete to damaging effects of deicers.
| Author | : W. J. Nowlen |
| Publisher | : |
| Total Pages | : 18 |
| Release | : 1968 |
| Genre | : Concrete |
| ISBN | : |
Download Influence of Aggregate Properties on Effectivness of Interlock Joints in Concrete Pavements Book in PDF, ePub and Kindle
| Author | : W. F. Kellerman |
| Publisher | : |
| Total Pages | : 22 |
| Release | : 1938* |
| Genre | : Cement |
| ISBN | : |
Download The Effect of Using a Blend of Portland and Natural Cement on Physical Properties of Concrete and Mortar Book in PDF, ePub and Kindle
| Author | : Tyler Ley |
| Publisher | : |
| Total Pages | : 47 |
| Release | : 2012 |
| Genre | : Pavements, Concrete |
| ISBN | : |
Download Concrete Pavement Mixture Design and Analysis (MDA) Book in PDF, ePub and Kindle
For years, specifications have focused on the water to cement ratio (w/cm) and strength of concrete, despite the majority of the volume of a concrete mixture consisting of aggregate. An aggregate distribution of roughly 60% coarse aggregate and 40% fine aggregate, regardless of gradation and availability of aggregates, has been used as the norm for a concrete pavement mixture. Efforts to reduce the costs and improve sustainability of concrete mixtures have pushed owners to pay closer attention to mixtures with a well-graded aggregate particle distribution. In general, workability has many different variables that are independent of gradation, such as paste volume and viscosity, aggregate's shape, and texture. A better understanding of how the properties of aggregates affect the workability of concrete is needed. The effects of aggregate characteristics on concrete properties, such as ability to be vibrated, strength, and resistivity, were investigated using mixtures in which the paste content and the w/cm were held constant. The results showed the different aggregate proportions, the maximum nominal aggregate sizes, and combinations of different aggregates all had an impact on the performance in the strength, slump, and box test.
