Effect of nano silica on the performance of cementitious grout for ground modification

Abstract

Growing infrastructure development gives rise to new advancements in construction industry. Nanotechnology contributes to the construction industry development by improvements made in the engineering properties of construction materials from the micro to the macro level as nano-composites. Cement plays a vital role in geotechnical applications as a chief material for wide range of ground modification techniques. Grouting is one of the techniques extensively applied to enhance advantageously the properties of different soil profiles and grain size with good reports of improved performance. This paper discusses the performance study made on a neat cementitious grout incorporated with nanosilica (nSiO 2). This study has been performed on the grout with a w/c ratio 1.20 at 0%, 0.10%, 0.50%, 1.0%, 1.50% of nanosilica dosage to cement content. Various rheological properties of the grout were studied along with permeation grouting onto a coarse sand column. It has been found that the nano silica enriched cementitious grout results in higher groutability, flowability with controlled bleedability with higher efficiency, reduced permeability and remarkable changes in the compressive strength.

Numerical study on the effect of rigid inclusions on existing railroads

“…Most of the problems mentioned above arise from a soft subgrade. A variety of ground improvement techniques have been adopted to address soft subgrade‐related issues, among others: grouting [eg,], soil mixing [eg,], micropile [eg,], soil nail [eg,], stone column [eg,], and rigid inclusions . The last one (also known as column‐supported embankment) are gaining more attention every time in geotechnical engineering in general [eg,], and in the railroad industry in particular [eg,].…”

“…Railroads issues associated with shrink/swell soils are discussed in detail in Sanchez et al 21 Most of the problems mentioned above arise from a soft subgrade. A variety of ground improvement techniques have been adopted to address soft subgrade-related issues, among others: grouting [eg, [22][23][24][25] ], soil mixing [eg, [26][27][28][29] ], micropile [eg, [30][31][32] ], soil nail [eg, [33][34][35][36] ], stone column [eg, [37][38][39][40], and rigid inclusions. [41][42][43][44][45][46][47][48][49][50][51][52] The last one (also known as column-supported embankment) are gaining more attention every time in geotechnical engineering in general [eg, [53][54][55][56][57][58][59][60][61], and in the railroad industry in particular [eg, [62][63][64][65]…”