Methods for Stabilizing and Strengthening Yoldian Clays and Weak Clay Soils When Creating a Subgrade in the Far North Regions

Mahmud Abu-Hasan; Valentina Y. Solov'eva; Antonina S. Saharova

doi:10.20295/1815-588X-2022-3-444-454

UDC 691

METHODS FOR STABILIZING AND STRENGTHENING YOLDIAN CLAYS AND WEAK CLAY SOILS WHEN CREATING A SUBGRADE IN THE FAR NORTH REGIONS Methods for Stabilizing and Strengthening Yoldian Clays and Weak Clay Soils When Creating a Subgrade in the Far North Regions

АА Аа

Published in Proceedings of Petersburg Transport University · Volume 19, Issue 3 · Pages 444–454 · Rubric: PROBLEMATIC OF TRANSPORT SYSTEM

DOI: https://doi.org/10.20295/1815-588X-2022-3-444-454

Received: 23.09.2022 Accepted: 25.09.2022 Published: 25.09.2022

Authors

Mahmud Abu-Hasan

Valentina Y. Solov'eva

Antonina S. Saharova

Mahmud Abu-Hasan

Academic degree: doctor of technical sciences

Science rang: professor

Emperor Alexander I St. Petersburg State Transport University Professor · Department " Structural Constructions" · Russian Federation · Saint-Petersburg

Valentina Y. Solov'eva

Academic degree: doctor of technical sciences

Science rang: professor

Emperor Alexander I St. Petersburg State Transport University head · Engineering Chemistry and Natural Sciences Department · Russian Federation

Antonina S. Saharova

Academic degree: candidate of technical sciences

Emperor Alexander I St. Petersburg State Transport University associate professor · Department of Engineering Chemistry and Natural Science · Russian Federation

ABSTRACT

Purpose: Definition of the most effective methods and components for strengthening weak Yoldian clays used in the creation of transport routes in the North regions. Methods: The definition of the main physical-mechanical characteristics of clay soil was carried out in accordance with the requirements: of GOST (Russia State Standard) 12536—2014 “Soils. Methods for laboratory determination of granulometric (grain) and microaggregate composition”; GOST 25584—2016 “Methods for laboratory determination of the filtration coefficient”; GOST 22733—2016 “Soils. Method for laboratory determination of maximum density”; GOST 5180—2015 “Soils. Methods of laboratory determination of physical characteristics”; GOST 25100—2020 “Soils. Classification”. It is shown that the effective strengthening of weak clay soil is achieved as a result of its preliminary stabilization with the help of granulated blast-furnace slag or natural limestone of ≈2.5 mm fraction. The rational amount of granulated blast-furnace slag or limestone is 15 wt.% of the soil mass and at the same time, clay soil has the highest strength value — (2.25–2.45) MPa. The difference in strength indicators in favor of limestone constitutes 9.0%. It has been experimentally established that in order to increase reinforced clay soil strength it is effective to use granulated blast-furnace slag in combination with finely ground blast-furnace slag which rational amount of is 10 wt.% of soil mass which achieved strength of corresponds to M20–M25 grade. It has been defined that for comprehensive improvement of the indicators as strength, density, and frost resistance it is necessary to introduce additionally to clay soil, reinforced with blast-furnace metallurgical slag as reactive components which it’s effective to use Portland cement in amount of not more than 5 wt.% of soil mass in combination with dry complex chemical additive “PRA” which rational amount of constitutes 2.0 wt.% by weight of (Portland cement + finely ground blast-furnace slag). Practical significance: Stabilized and comprehensively strengthened weak clayey soil is characterized by the following actual indicators: M50 F35 K10 — 0.026 m/day which can be used as a base at construction of transport routes of local importance in the regions of the North.

KEYWORDS

Clay soil, stabilization, strengthening, strength, filtration coefficient, granulated blast-furnace slag, finely ground slag, chemical additive

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Oleg S. Valinskiy

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Dmitry Kurilkin

It@pgups.ru

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Andrey Evstaf'ev

elt@pgups.ru

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zhurnala P. Redakciya

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GOST

Abu-Hasan M. S., Solov'eva V. Y., Saharova A. S. Methods for Stabilizing and Strengthening Yoldian Clays and Weak Clay Soils When Creating a Subgrade in the Far North Regions // Proceedings of Petersburg Transport University. 2022. no. 3. pp. 444-454. DOI: https://doi.org/10.20295/1815-588X-2022-3-444-454. (Date of access 13.10.2026).

MLA

Mahmud Abu-Hasan, Solov'eva V. Y., Saharova A. S.. "Methods for Stabilizing and Strengthening Yoldian Clays and Weak Clay Soils When Creating a Subgrade in the Far North Regions." Proceedings of Petersburg Transport University 19.3 (2022): 444-454. DOI: https://doi.org/10.20295/1815-588X-2022-3-444-454.

APA

Abu-Hasan M. S., Solov'eva V. Y., Saharova A. S. (2022). Methods for Stabilizing and Strengthening Yoldian Clays and Weak Clay Soils When Creating a Subgrade in the Far North Regions. Proceedings of Petersburg Transport University, 19(3), 444-454. https://doi.org/10.20295/1815-588X-2022-3-444-454

Chicago

Mahmud Abu-Hasan, Solov'eva V. Y., Saharova A. S.. "Methods for Stabilizing and Strengthening Yoldian Clays and Weak Clay Soils When Creating a Subgrade in the Far North Regions." Proceedings of Petersburg Transport University 19, no. 3 (2022): 444-454. https://doi.org/10.20295/1815-588X-2022-3-444-454.

WIKI

{{cite journal | author = Abu-Hasan M. S., Solov'eva V. Y., Saharova A. S. | title = Methods for Stabilizing and Strengthening Yoldian Clays and Weak Clay Soils When Creating a Subgrade in the Far North Regions | journal = Proceedings of Petersburg Transport University | year = 2022 | volume = 19 | issue = 3 | pages = 444-454 | doi = 10.20295/1815-588X-2022-3-444-454 }}

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METHODS FOR STABILIZING AND STRENGTHENING YOLDIAN CLAYS AND WEAK CLAY SOILS WHEN CREATING A SUBGRADE IN THE FAR NORTH REGIONS Methods for Stabilizing and Strengthening Yoldian Clays and Weak Clay Soils When Creating a Subgrade in the Far North Regions

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