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 Spanish guide for the design and construction of soil anchors in road works 4 calls for a w: Climent Universidad de Alicante Spain.
Most of the grouts prepared with slag-bearing cement meet the compressive strength requirements laid down in fuia various codes and standards for micropiles and soil anchors, whether measured on cm diameter, cm high cylindrical specimens or 4-cm square, cm deep prismatic specimens.
Three specimens were tested per cement type and w: This parameter was determined with the capillary absorption method described in Spanish standard UNE This parameter is an indirect measure of connectivity and pore size in a material. Portland cement grouts made with the same w: These findings may be related to the substantial microstructural refinement attendant upon slag hydration 6728in which additional C-S-H phases form 12giving rise to a more compact pore network.
Durability and compressive strength of blast furnace slag-based micropikotes grout for special geotechnical applications. Upon conclusion of the test, the specimens were split along the centreline and the depth of water penetration was measured in each half.
The protocol for monitoring soil anchor construction laid down in the aforementioned guide 4 suggests that compressive strength should be determined in 7- and day grout.
These findings are likewise consistent with the results of the other parameters studied. Email this article Login required. Keywords Aggregate Characterization Composite Compressive strength Concrete Durability Mechanical properties Mortar Portland cement Waste treatment cement characterization compressive strength concrete corrosion durability fly ash mechanical properties microstructure mortar physical properties.
The results of this test for each type of cement and w: Effective porosity, in turn, is directly related to the volume micropilofes pores accessible to water and therefore to aggressive agents such as chloride ions, which may corrode the steel used to reinforce micropiles and soil micropilotex. This study, as noted earlier, aimed to analyse the behaviour of cement grout, not concrete. Ortega Universidad de Alicante, Spain.
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As in micropiles, the cement grout for soil anchors is normally prepared with type Micdopilotes portland cement, although neither standard UNE-EN The study of the durability of cement grout, particularly blast furnace slag-based grout, is consequently highly pertinent. Electrical resistivity readings furnish information on pore connectivity and size in materials, both of which parameters are associated with durability.
That notwithstanding, as explained above, this test was conducted because the codes and microopilotes on soil anchors and micropiles 24 explicitly provide that grout must be EHEcompliant 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 portland cement.
Effective porosity was determined from the following equation [ 1 ], further to standard UNE Although this test is actually designed for hardened concretes cured under water 29it was applied here to the cement grout because the standards on micropiles 2 and soil anchors 4 refer to the provisions of Spanish Structural Concrete Code EHE for characterising most grout properties Electrical resistivity rose with time for both types of cement studied see Figure 2denoting the progressive refinement of the pore network as a result of ongoing clinker and slag hydration 6 The Spanish guiz for designing and building micropiles in road works 2 envisages w: Grouts were prepared with jicropilotes commercial cements, a type I Indeed, in the day specimens, all the CEM III grouts studied had similar or lower effective porosity, depth of water penetration under pressure and steady state chloride diffusion coefficients than the CEM I grout with a w: Durability and Degradation of Cement Systems: Norma UNEMadrid.
Nonetheless, the effect on the in-service properties durability and mechanical strength of the slag cement grout used in special geotechnical applications such as micropiles and soil anchors has not been researched.
They are used in retaining structures, bridge abutments and landside control 4. User Username Password Remember me. The findings for this parameter are depicted in Figure 3. Cement grout for micropiles and soil anchors made with high blast furnace slag content cement can develop suitable mechanical strength and durability after hardening for a specified time.
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. Special foundations for buildings and civil works are becoming increasingly common in construction today.
At longer hardening times, these adverse consequences of high temperature drying would be mitigated by the refinement of the CEM III pore network, as shown by the electrical resistivity results discussed earlier.
Three prismatic and two cylindrical specimens were tested per cement type and w: Here it was determined in cement paste specimens using the Wenner four-point test 20 described in Spanish standard UNE Essential tool for analysis of Hygral behaviour and its ugia to pore structure, Cem.
In the present study, this property was analysed in terms of the steady state chloride diffusion coefficient, found indirectly from electrical resistivity data Figure 7 shows the compressive strength findings for cylindrical and prismatic specimens made with both types of cement.
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The micrkpilotes of cement grouts for soil anchors and micropiles is of cardinal importance for the prevention of reinforcement corrosion. Article Tools Print this article. Corrosion and Chloride Transport; T4.