Use of Phosphoric Acid and Rice Hulk Ash as Lateritic Soil Stabilizers for Paving Applications

Phosphoric acid (H3PO4) is a product that can be used as a stabilizing additive for tropical soils in an exploratory manner by the construction industry. For the drying process of this grain, its husks are used as fuel for ovens, generating rice husk ash (RHA), which is considered an environmental l...

Full description

Saved in:
Bibliographic Details
Published in:Sustainability 2023-04, Vol.15 (9), p.7160
Main Authors: Silva, Angelo Magno dos Santos e, Pascoal, Paula Taiane, Baroni, Magnos, Vargas, Alexandre Silva de, Budny, Jaelson, Specht, Luciano Pivoto
Format: Article
Language:English
Subjects:
Acids
Ashes
Clay
Compressive strength
Construction industry
Cooling
Curing
Environmental liability
Mixtures
Paving
Permeability
Phosphates
Phosphoric acid
Resilience
Rice
Scanning electron microscopy
Soil compaction
Soil mechanics
Soils
Stabilization
Tropical environments
Tropical soils
X-ray diffraction
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Phosphoric acid (H3PO4) is a product that can be used as a stabilizing additive for tropical soils in an exploratory manner by the construction industry. For the drying process of this grain, its husks are used as fuel for ovens, generating rice husk ash (RHA), which is considered an environmental liability if not reused. In this sense, this paper aimed to evaluate the resilient behavior and the simple compressive strength, at different curing ages, of the use of rice husk ash and phosphoric acid in a simple and combined mixture for the stabilization of lateritic soil. The lateritic soil was mixed with different contents of RHA, H3PO4, and water and compacted in intermediate and modified Proctor energies. Fractured soil samples in the mechanical compressive strength tests were analysed by scanning electron microscopy and X-ray diffraction. The results show the potential for stabilization of the lateritic soil in question in terms of resilience and simple compressive strength through the addition of RHA and H3PO4 at different curing ages. The insertion of only H3PO4 produced the most satisfying resilient behavior. By adding RHA, the strength properties were improved, and good mixtures were obtained for use in paving.
ISSN:2071-1050
2071-1050
DOI:10.3390/su15097160