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Crack is produced by dissolving powdered cocaine in a mixture of water and ammonia or sodium bicarbonate (baking soda). The mixture is boiled until a solid substance forms. The solid is removed from the liquid, dried, and then broken into the chunks (rocks) that are sold as crack cocaine.
Individuals of all ages use crack cocaine--data reported in the National Household Survey on Drug Abuse indicate that an estimated 6,222,000 U.S. residents aged 12 and older used crack at least once in their lifetime. The survey also revealed that hundreds of thousands of teenagers and young adults use crack cocaine--150,000 individuals aged 12 to 17 and 1,003,000 individuals aged 18 to 25 used the drug at least once.
Q. What causes a cake to crack? A. Don't leave out the oil! Speaking of liquid ingredients, be sure to follow the directions on the package and measure carefully. To measure liquid, place a liquid measuring cup on your counter, pour in the liquid, bend down and check the amount at eye level.
Sealant is a pre-mixed, ready-to-use liquid that is combined with grout powder in lieu of water. Sealant designed to make grout joints less susceptible to moisture penetration, protecting the grout against stains, mold, and mildew and taking the place of secondary sealants typically applied post-installation.
Latex additives are mixed into grout to improve workability, flexibility, adhesion, impact strength and freeze-thaw resistance. These additives can also increase bond strength and make the grout cure harder, says Chavoustie. Another benefit is making the tile joints less susceptible to water penetration.
HMA is a rather complex material upon which many different, and sometimes conflicting, performance demands are placed. It must resist deformation and cracking, be durable over time, resist water damage, provide a good tractive surface, and yet be inexpensive, readily made and easily placed. In order to meet these demands, the mix designer can manipulate all of three variables:
HMA mix design is a laboratory process used to determine the appropriate aggregate, asphalt binder and their proportions for use in HMA. Mix design is a process to manipulate three variables: (1) aggregate, (2) asphalt binder content and (3) the ratio of aggregate to asphalt binder with the objective of obtaining an HMA that is deformation resistant, fatigue resistant, low temperature crack resistant, durable, moisture damage resistant, skid resistant and workable. Although mix design has many limitations it has proven to be a cost-effective method to provide crucial information that can be used to formulate a high-performance HMA.
Mix was laid in two lifts. The first lift, called the cushion coat, contained 2 to 4 percent more asphalt and was compacted to a depth of one-half inch. The surface coat was made according to the specifications above. The lime was added cold to the hot (300º F) sand before the asphalt was mixed in. The quantity of lime was adjusted according to the properties of the sand. Proportions were adjusted based on visual observation of experienced personnel.
In the 1920s, oil mix made with cutback asphalt was a common method of paving. It was mixed in windrows with the asphalt sprayed on top of a knocked-down windrow and mixed back and forth with a motor grader. Oil content was determined by eye, so an experienced person was needed to ensure that the mix had the proper brown color.
Empty contents of bag into mortar box, wheelbarrow, or mechanical mixer. When mixing by hand, form a crater for adding water. Add approximately 2.2 L (2.25 qt) of clean water per 30 kg (66 lb) bag or enough to achieve a workable mix. Avoid a soupy mix. Excess water reduces strength and durability and can cause cracking. In cold weather, use warm water to accelerate the set. In hot weather, use cold water to slow the set.
The prediction of failure mode in rock bridges andits shear strength could help us to determine crackpropagation path in large rock structure. In other way,the crack propagation path and crack coalescencemode in large rock structure are two key factors in controlling the direction of sliding movement of unstableblock and its shear strength.
Shear fracture toughness is an important material behavior that needs to be determined and considered in many industrial fields. At the same time, shear testing is one of the complex material testing areas where available methods are few, often need special arrangements, and most of the methods do not strictly satisfy the definition of pure shear. In this study, a modified shear test specimen was proposed to measure the shear fracture toughness by uniaxial loading in a tensile testing machine. High density polyethylene (HDPE) was used as test material for the experiments. The specimen was created in order to suit the most common used tensile test machine. The specimen was then optimized by using finite element analysis (FEA) to find the geometry and the size of the pre-notch to avoid the mixed mode loading and minimize effects of normal stresses. For the specimen in discussion, an upper and lower limit of usable ligament length can be found. A method for determining the fracture toughness was discussed according to the essential work of fracture. Finally, an example of a special application of the proposed specimen was presented where the variation of shear strength of controlled delamination material (CDM) was measured.
Multi-layered thin laminate of Low-density polyethylene (LDPE) and aluminum (Al), also known as Al/LDPE laminate, is another key object addressed in this study. Continuum and fracture testing of individual layers provided the base information and input for numerical modeling. The propagation of an interfacial pre-crack in lamination in Al-LDPE laminate was simulated using several numerical techniques available in the commercial FEM solver ABAQUS, and it was concluded that using the combination of VCCT technique to model the interfacial delamination and coupled elasto-plastic damage constitutive for Al and LDPE substrates can describe interfacial delamination and failure due to necking. It was also concluded that the delamination mode in a pre-crack tip is influenced by the ratio of fracture energy release rate of mode I and II. To address the challenge in quantifying shear energy release rate of laminate with very thin substrate, a convenient test technique is proposed. Additionally, scanning electron microscopic study provided useful information on fractured and delaminated surfaces and provided evidence that strengthened the conclusions of this work.
Thin-flexible laminate of low-density polyethylene (LDPE) and aluminium (Al) is another key packaging material addressed in this study. The continuum and fracture testing of individual layers provided the base information and input for FE-modelling. The FE-simulation material parameters were calibrated from the physical test response through inverse analysis. Identification process of the laminate interface fracture energy (Gc) from peel tests was studied experimentally and theoretically. A successful FE-simulation optimization framework using artificial neural network and genetic algorithm was developed for the calibration of Gc. To address the challenge in quantifying shear Gc of laminate with very thin substrates, a convenient test technique was proposed. In a separate case, the tearing response of LDPE/PET (polyethylene terephthalate) laminate was studied to examine crack propagation, crack path deviation and delamination of the laminate in mode III fracture. Several tear EWF evaluation theories were proposed along with a cyclic tear test method. 2b1af7f3a8