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Three specimens were tested per cement type and w: These findings are likewise consistent with the results of the other parameters studied.

The samples were extracted from the 1 cm thick disks. Note that in both the and day specimens, at the w: 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 How to cite item.

Keywords Ground granulated micro;ilotes slag; Cement grout; Special geotechnical applications; Durability; Compressive strength. US manual FHWA-SA 1in turn, stipulates that the compressive strength of grout used to build micropiles should be determined on 5-cm cubic specimens, which were not tested in this study. The findings for this parameter are depicted in Figure 3. Albaladejo Universidad de Alicante Spain.

Free Download Online Guia Para El Proyecto Y La Ejecucion De Micropilotes En Obras Pdf By Aavv

In light of the foregoing, in this study compressive strength was determined on the 7- micropilotse day specimens prepared as described above. The findings also indicate that the w: Portland cement grouts made with the same w: Electrochemical techniques for measuring metallic corrosion – Test methods for on site measurement of resistivity of concrete. This improvement is related to the hydraulic properties of blast furnace slag.


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Cement grout micropilptes micropiles is generally prepared with a w: The study of the durability of cement grout, particularly blast furnace slag-based grout, is consequently highly pertinent. Nonetheless, the effect on the in-service properties durability and mechanical strength of the slag cement grout used in special geotechnical applications micropiotes as micropiles and soil anchors has not been researched.

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.

Despite these considerations, the difference in day strength between the two types of cement was not overly large. Essential tool for analysis of Hygral behaviour and its relation to pore structure, Cem. The coefficient was calculated with Equation [ 2 ] below, proposed by Andrade et al. The post-submersion absorption values were very similar in the day specimens for the two types of 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 micropilohes slag content the material has a micropiloes refined pore network than when prepared with a comparable portland cement.

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. Eight samples were tested per cement type and w: In this study, the variation in the diffusion coefficient D s guka monitored through the age of 90 days.


Abstract Special foundations, most prominently micropiles and soil anchors, are frequently used in construction today. The characterisation of cement grouts for soil anchors and micropiles is of cardinal importance for the prevention of reinforcement corrosion. The penetration of water under pressure is a test 29 recommended in Spanish Structural Concrete Code EHE 30 to measure water permeability in concrete. Spanish and European codes on micropiles 23 call for a day or the age when the micropile is loaded, if prior to that time compressive strength of at least 25 MPa in cylindrical specimens.


Climent Universidad de Alicante, Spain. Figure 1 a contains elevation and cross-section sketches of a micropile with steel tube reinforcement.

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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 i.

The appearance of these cracks, in combination with a scantly refined early age pore network, might explain the high effective porosity values observed for the CEM III material. Durability and compressive strength of blast furnace slag-based cement grout for special geotechnical applications.

Post-submersion absorption furnishes information on the pore volume in a material. Climent Universidad de Alicante Spain.

Moreover, the fact that early age electrical resistivity values were similar in the two types of cement studied, but slightly higher for CEM I at w: