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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.
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. This result concurs with previous reports 628according to which blast furnace slag refines the cement pore network but such refinement does not translate into any material reduction in total porosity. Micropiles are cylindrical members with diameters of under mm, drilled and grouted with cement grout or mortar injected in one or two phases, reinforced with steel tubing and sometimes strengthened with one or several ribbed bars 12.
Eight samples were tested per cement type and w: 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. The Spanish guide for the design and construction of soil anchors in road works 4 calls for a w: Tests were conducted on 2- 7-,and day specimens.
Email this article Login required. Albaladejo Universidad de Alicante, Spain. In light of the foregoing, in this study compressive strength was determined on the 7- and day specimens prepared as described above.
These members, which transfer surface tensile stress to the undersoil 4consist essentially of a head and a free and a fixed anchor 45as shown in Figure 1 b. Tests were conducted on 2- micropilotss, and day specimens. The results show that slag grout exhibits greater durability than the portland cement material and complies with the compressive strength requirements laid down in the respective codes.
Note that the fixed anchor transfers the load to the terrain across cement grout, which can also be used to fill the rest of the bore hole. Special foundations for buildings and civil works are becoming increasingly common in construction today.
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The samples were extracted from the 1 cm thick disks. The high short-term effective porosity observed for CEM III may be related to the slower reaction rate that characterises slag hydration, as discussed earlier in connection with the electrical resistivity and absorption findings.
Three specimens were tested per cement type and w: Figure 7 shows the mivropilotes strength findings for cylindrical and prismatic specimens made with both types of cement.
Although the former procedure entails a lower risk of microstructural alterations due to the lower drying temperature, its implementation calls for fairly long test times on the order of at least one month for each condition tested.
Those texts also establish a range of acceptable water: This would mean that at very early ages, the microstructure of CEM III would be less refined than at older ages and the volume of pores accessible to water would be greater. 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. Other cylindrical specimens were cast to diameters of 10 and 15 cm and a height of 30 cm.
User Username Password Remember me. 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.
Post-submersion absorption furnishes information on the pore volume in a material.
The penetration of water under pressure is a test 29 recommended in Spanish Structural Concrete Code EHE 30 to measure water permeability in concrete. Cement grout for micropiles is generally prepared with a w: In the present study, this property was analysed in terms of the steady state chloride diffusion coefficient, found micrppilotes from electrical resistivity data In this study, effective porosity was the parameter used to assess durability, for water is the main vehicle for the ingress of micropilotew agents in cement-based materials Ortega Universidad de Alicante Spain.