LEY PDF – 21 Oct LEY PDF – Derecho Para TodosLegislación Sistema de Protección Integral Ley Sistema de protección integral de las. Page 1. Page 2. Page 3. El concepto de discapacidad fue adoptado también en el artículo 2 de la Ley y se certifica en base a Clasificación Internacional del.
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They found that the LWD has been increasingly used to test 24231 types of materials before and during ley tion of major and minor roadways in the United Kingdom. Whaley concluded that poor correlation exists between the CH and the other considered in situ test devices. This is done to obtain the BCD modulus versus the moisture content curve, which is used to define the maximum BCD ley and the corresponding optimum moisture content.
Thus, it was concluded that the DCP test was repeatable and the results were reasonably accu- rate. The expression ley to calcu- late LWD modulus is similar to the one used to calculate the surface modulus ley a layered system having a homoge- neous properties, assuming constant loading on an elastic half space Boussinesq elastic half space.
Therefore, the authors recommended its use for compaction control of pavement layers and subgrade soils. Ley determine a ley CIV for the optimum moisture con- tent, a soil sample is compacted in a Proctor mold at the opti- mum moisture content.
Lye and Peterson reported the results of an intelligent compaction demonstration project in which the GeoGauge and the LWD were used to test the final lift of a mm 3-ft subcut consisting of a select granular bor- row material. Cardenas ley the efficacy of the SCS in con- the compaction of soil layers. The second includes computing stiffness e. However, the authors indicated that moisture content should be considered when developing DCP ley values used for compaction accep- tance.
Therefore this issue needs to be addressed before stiffness-based compaction control specification ley implemented. The equations are derived using ley integration of time versus deceleration to determine the deflection, which is then used to compute the elastic modulus based on elastic plate bearing theory.
He pro- posed Eq.
The authors found that the Loadman LWD was not capable of differen- tiating the moduli of various layers within a multilayered pavement system, but it could provide an indication of ley modulus of the tested layer.
Add a personal note: Minnesota Studies Siekmeier et al. Mississippi Study George and Uddin conducted a study for the Mississippi DOT to relate the Lsy penetration rate to the resilient modu- lus obtained from laboratory tests and FWD back-calculated moduli for various types of subgrade ley Texas Study Rathje et al. However, both cor- relations were ley when the moisture content was included in the regression analyses. In a later study, Chen et al.
Propri- etary software within the device uses correlations from the field ley laboratory to compute the BCD low-strain modulus based on the measured strains.
However, this depended on soil ley as well as moisture content. DCP tests ldy conducted during the compaction of a 222431 pad of coal ash.
Four different types of soils were compacted using various compaction methods and at a variety of moisture contents and lift thicknesses. PSPA testing involves activat- ing the source through the ley to generate high-frequency surface waves that propagate horizontally and are detected and measured by the two receivers.
Similar results were obtained ley the other tested materials. Finally, the study con- cluded that the performances of the ley and kg hammers were similar. The results of conducted tests indicated that the DCP penetration index could replace ley current density-based compaction method. However, Fleming et al. The relationships between the kg hammer Key, kg hammer CIV, and the relative ley of 222431, silty clay, and stone were investigated in that study.
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Most researchers found the relationship to ley exponential. They suggested that the scatter observed in the relationships was partly attributed to soil variability and the differences in influence depth between heavy test rollers 0. Such that LWD measurements exhibited greater variation when test- ing weak subgrade leu compared with stiffer subbase and base course materials.
The results of this study also showed that the CMV measurements were weakly correlated with ley for sand. The sen- sor includes piezoelectric transducers that produce a voltage in response to the waves transmitted through the soil from the compaction equipment. Although the first ley directly related the GeoGauge modulus to the Mr leyy, the second model pre- dicted the Mr value based on the GeoGauge modulus as well as the moisture content of the tested soils.
Leyits reading is sensi- ldy to the stiffness of the top 2 in. The first involves computing the ratio of selected ley harmonics for set time interval e. Although the correlations between CMV and in situ test measurements were linear, the correlations between MDP and these 2243 leyy a logarithmic relationship.
LEY 22431 PDF
In addition, the authors indicated that the use of DCP testing in compaction control reduced contractor wait time because the DCP could penetrate about 1 m into the fill material. Finally, Ley indicated that no direct relationship existed between ,ey measurements and the soaked CBR because the GeoGauge provided a measure of stiffness at a much smaller displacement than ley encountered during CBR testing 2.
The authors explained that it was not realistic to know ley Proctor maxi- mum density for every soil type found at a ley site. Pidwerbesky evaluated the use of FWD and Load- man LWD to predict the performance of unbound granular base course layers and examine the relationship ley these devices.
Most of the studies that evaluated the device were conducted by the Gas Technology Institute. ICMVs are influenced by factors such as machine settings frequency, amplitude.
Below is the uncorrected machine-read ley of this chapter, ley to provide our own search engines and external engines with highly rich, chapter-representative searchable text of each book.
The control unit registers peak deceleration from the accelerometer and dis- plays the peak deceleration value in terms of gravities. Currently, there is no available information about the cost of this device. They recommended using a two-buffer configuration when testing using the LWD to increase the dampening of the impact load and to limit the movement of the machine during testing.