Esta guía para,oyecto y la ejecución de micropilotes en obras de carretera forma parte de una serie de un documento de divulgación tecnológica elaborados. See details and download book: Ebookers Free Download Guia Para El Proyecto Y La Ejecucion De Micropilotes En Obras By Aavv Fb2. Cálculo de micropilotes de cimentación y dimensionado de su longitud, según guía del Ministerio de Fomento. ESFUERZOS Y REACCIONES. Cálculo de Viga .

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The legislation on soil anchors 45in turn, stipulates no specific geometry for the specimens to be used in compressive strength tests. Moreover, the fact that in soil anchors and micropiles the reinforcing steel is embedded in cement grout cement paste distinguishes these members from other civil engineering structures, where it is embedded in concrete. The characterisation of cement grouts for soil mciropilotes and micropilotez is of cardinal importance for the prevention of reinforcement corrosion.

Study by impedance spectroscopy, en: This finding was foreseeable, given the higher strength class of CEM I Standard test method for specific gravity, absorption, and voids in hardened concrete, Philadelphia.

The findings therefore indicate that in the short term the total pore volume was higher in the CEM III grout, whereas the long-term volume was very similar in the two materials. All the grouts studied here also met these specifications, with micropiltoes exception of the CEM I materials with a w: Tests were conducted on 2-,and day specimens.

Both cements were compliant with reference guide 24 minimum strength class requirements Figure 7 shows the compressive strength findings for cylindrical micropiilotes prismatic specimens made with both types of cement. Note that in both the and day specimens, at the w: Despite these considerations, the difference in day strength between the two types of cement was not overly large.


This finding could have practical consequences, since the Spanish guide for designing and building soil anchors in road works 4for instance, stipulates that the cement grout used for anti-corrosion protection in contact with reinforcing steel micrpoilotes.

After 28 days, however, porosity was substantially lower in the former.

The coefficient was calculated with Equation [ 2 ] below, proposed by Andrade et al. Consequently, given the relationship between microstructure and durability in cement-based materials 1314blast furnace slag additions reduce their permeability and enhance their resistance to aggressive agent ingress 8 Special foundations for buildings and civil works micopilotes becoming increasingly common in construction today.

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This procedure has been micropilots in the past for fly ash- and blast furnace slag-blended cement Further to the electrical resistivity and post-submersion absorption findings for hardened grout designed for micropiles and soil anchors, when made from cements with a high blast furnace slag content the material has a more refined pore network than when prepared with a comparable guiaa cement.

These findings may be related to the substantial microstructural refinement attendant upon slag hydration 6728in which mixropilotes C-S-H phases form 12giving rise to a more compact pore network. Slag-blended cement grout exhibits more favourable long-term durability properties than portland cement grout. Durability and Degradation of Cement Systems: The penetration of water under pressure is a test 29 recommended in Spanish Structural Concrete Code EHE 30 to measure water permeability in concrete.

???? Ebookers Free Download Guia Para El Proyecto Y La Ejecucion De Micropilotes En Obras By Aavv Fb2

Grout chloride resistance was also analysed, inasmuch as these ions are among the primary inducers of steel corrosion, particularly in micropiles and soil anchors in contact with aggressive water or soil. The high short-term effective porosity observed for CEM III may be related to the slower reaction rate that characterises slag hydration, as microiplotes earlier in connection with the electrical resistivity and absorption findings.


Soil anchors are another type of special geotechnical application. Cylindrical specimens 10 cm in diameter and 15 cm high were moulded and then cut into disks 1 to 5 cm thick to study post-submersion water absorption and determine effective porosity.

The mechanical property studied was compressive strength, since as noted above, this is the main parameter used in codes gia standards for determining whether a cement is apt for such applications.

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Grouts were prepared with two commercial cements, a type I Nonetheless, this indirect method for calculating the diffusion coefficient obviates the beneficial effect of the higher aluminate content in CEM III grout 15 on chloride resistance. These aluminates, formed as a result of the hydration of the high Al 2 O 3 content in blast furnace slag, react with chlorides to form chloraluminates, thereby preventing ion diffusion across the material That notwithstanding, as explained above, this test was conducted because the codes and standards on soil anchors and micropiles 24 explicitly provide that grout must be EHEcompliant Electrical resistivity readings furnish information on pore connectivity and size in materials, both of which parameters are associated with durability.

In Spain, the grout for these special technical applications is generally prepared with portland cement, although the codes and standards in place stipulate only the minimum compressive strength required, with no mention of cement type.

This improvement is related to the hydraulic properties of blast furnace slag.