Related Experiment Video
Updated: Jun 26, 2025
06:27
Sandy Soil Improvement through Microbially Induced Calcite Precipitation MICP by Immersion
Published on: September 12, 2019
9.4K
The Time-Dependent Interfacial Adhesion between Artificial Rock and Fresh Mortar Modified by Nanoclay
Xiaoyun Wang1,2, Kim Van Tittelboom2, Jiaolong Zhang1,3
1College of Civil Engineering, Tongji University, Shanghai 200092, China.
Nanomaterials (Basel, Switzerland)
|May 10, 2024
Summary
Adding nanoclay to fresh mortar significantly improves time-dependent interfacial adhesion with rock, crucial for preventing tunnel lining failures. This enhancement is vital for advancing concrete printing in underground construction.
Area of Science:
- Materials Science
- Civil Engineering
- Geotechnical Engineering
Background:
- Time-dependent interfacial adhesion between rock and fresh mortar is critical for successful concrete printing in tunnel linings.
- Adhesion failure can occur due to a lack of understanding of this evolving bond.
- Nanoclay shows promise for enhancing this interfacial adhesion.
Purpose of the Study:
- To investigate the time-dependent interfacial adhesion between artificial rock and nanoclay-modified fresh mortar.
- To quantify the effects of nanoclay on interfacial strength and failure modes.
- To understand the mechanisms behind nanoclay's influence on adhesion evolution.
Main Methods:
- Utilized fast tack tests and fast shear tests to measure interfacial strength.
- Employed isothermal calorimetry to study hydration kinetics.
- Analyzed failure modes under varying resting times and nanoclay concentrations.
Main Results:
- Nanoclay addition substantially increased maximum tensile and shear stresses at the interface.
- A 0.3% nanoclay concentration led to significant increases in interfacial strength (106% at 1 min, 209% at 32 min).
- A two-stage adhesion evolution was observed: rapid initial increase followed by linear, sustained growth, with nanoclay accelerating the rate.
Conclusions:
- Nanoclay effectively enhances time-dependent interfacial adhesion between mortar and rock, mitigating adhesion failure risks.
- The improved adhesion is attributed to nanoclay's effects on flocculation and accelerated hydration.
- Nanoclay promotes a transition from ductile to brittle failure modes due to matrix stiffening, indicating a stronger bond.
Related Concept Videos
01:17Mortar Properties
122
Mortar properties encompass a range of characteristics crucial for construction and masonry work, including workability, water retention, bond strength, durability, compressive strength, volume change, and appearance. Workability refers to mortar's ability to be easily applied and manipulated without sagging or falling off surfaces, which is important for efficient masonry unit placement and alignment. Water retention is essential to prevent the mortar from losing moisture too quickly to...
122
01:13Mortar Joint Deterioration in Masonry
114
Mortar joint deterioration is a significant concern in masonry structures, with water accumulation in the joints leading to damage from freeze-thaw cycles. The repeated expansion of water during freezing and its melting during thawing develop and propagate cracks in the masonry joints. Eventually, this leads to the spalling of mortar from the joints, loosening masonry units and weakening the structure. The deteriorated mortar joints are also vulnerable to moisture intrusion into the walls.
The...
The...
114
01:25Mortar Joints in Brick Masonry
106
Mortar joints play a critical role in brick masonry, filling the spaces between brick to bind them together and provide structural integrity and strength. The thickness of these joints is variable, typically ranging from less than one-fourth inch to over half an inch, based on structural needs and specific applications.
The process of joint tooling is implemented as the mortar begins to harden. This technique involves compacting and shaping the mortar to enhance both the appearance and the...
The process of joint tooling is implemented as the mortar begins to harden. This technique involves compacting and shaping the mortar to enhance both the appearance and the...
106
01:29Mortar
210
Mortar, a mixture of Portland cement, hydrated lime, sand, and water, is a crucial binding material in construction. Its primary function is to join masonry units together, filling gaps and ensuring a uniform distribution of weight across the structure. This helps in preventing potential weaknesses. Mortar also serves as a protective barrier against environmental elements such as water and wind, thereby safeguarding the interior of the structure. It also compensates for surface irregularities...
210
01:29Stone Masonry
105
Stone masonry is a construction technique that uses individual stones to build structures and can be categorized into two main types: rubble and ashlar. Rubble masonry uses uneven, naturally shaped stones such as river rocks or fragments from quarries. This method often requires the mason to select and possibly shape each stone to fit the designated space, ensuring a proper build, even with irregular stone sizes and shapes. Ashlar masonry, on the other hand, employs uniformly cut stones that...
105
01:18Porosity in Cement Paste
126
The porosity of concrete is a measure of the void spaces within its structure. These spaces impact its strength and durability significantly. When water and cement interact, a chemical reaction called hydration creates a semi-solid paste. This paste includes combined water, making up approximately 23% of the cement's dry mass, and gel water, which fills minuscule voids known as gel pores, accounting for about 28% of the cement gel volume.
The balance of water to cement in the mix is...
The balance of water to cement in the mix is...
126