A Review on Concrete Superplasticizers and Their Potential Applications for Enhancing the Performance of Thermally Activated Recycled Cement
Abstract
:1. Introduction
2. Classification and Mechanisms of Superplasticizers
3. Comparison of Physical and Chemical Properties between RC and OPC
4. Potential Superplasticizers for Thermally Activated RC
4.1. Polyacrylate-Type Superplasticizers
4.2. Polymer Polycarboxylate Superplasticizers
4.3. Sulfate-Based Superplasticizers
4.4. Inorganic Superplasticizers
5. Conclusions
- The differences between OPC and RC include:
- (1)
- Chemical composition: RC contains more CaO than OPC and lacks C3S.
- (2)
- Specific surface area: The specific surface area of RC is larger than that of OPC.
- (3)
- Hydration rate: RC releases a lot of heat in the early stage of hydration, and the hydration rate of RC is faster than that of OPC.
- The different mechanisms of superplasticizers when applied to ordinary cement and RC include:
- (1)
- Surface property disparity: More rougher surfaces and impurities may be contained in RC particles, which necessitate the use of superplasticizers with stronger dispersive capabilities to enhance their workability.
- (2)
- Chemical reactivity: The potential presence of any residual chemical additives or aging products in RC necessitates that the superplasticizer possesses chemical reactivity that is compatible with these components to prevent performance degradation caused by chemical reactions.
- (3)
- Adsorption behavior: The adsorption behavior of the superplasticizer can be altered by the different mineral components in RC, which affects its water-reducing effectiveness and stability.
- Characteristics of superplasticizers that may be suitable for RC include:
- (1)
- With high-efficiency dispersing capabilities, dispersion effects at the molecular level can be optimized through the design of long-chain structures and side chains; this method is suitable for addressing the irregular and diverse particle size distribution in RC and can effectively cope with any potential impurities.
- (2)
- The ability to adapt to complex cementitious matrices can be enhanced by altering the molecular structure, such as the introduction of functional groups and the adjustment of molecular chain lengths.
- (3)
- The performance of polyacrylate superplasticizers in thermally activated RC could be significantly impacted by their molecular structure. By designing and adjusting the molecular structure, the performance of thermally activated RC-based materials can be improved by altering the surface charge properties.
- (4)
- Temperature sensitivity of superplasticizers is another important factor. The initial hydration heat release of RC is large and can easily have an impact on the high temperature sensitivity of the superplasticizers, such as polycarboxylate superplasticizers. They can be considered when supplemented together with plasticizers based on lignosulfonates.
- Future research and development directions:
- (1)
- The impact of different components in RC from different sources on the adsorption of superplasticizers should be investigated. This includes assessing the surface charge characteristics of various mineral phases and how they are affected by the adsorption and dispersing performance of superplasticizers.
- (2)
- An in-depth study of the adsorption and self-assembly behavior of polyacrylate-based superplasticizers within the RC system should be conducted to better understand their mechanisms of action in the dispersion of RC particles. This involves exploring the structure and function of the superplasticizer molecular layer on the surface of RC particles.
- (3)
- Compounding technology can be utilized to blend two or more high-efficiency superplasticizers in specific proportions, thereby altering some of their individual properties while internally coordinating to produce a synergistic effect for RC.
- (4)
- Furthermore, further systematical research is needed to investigate the adsorption and lubrication behaviors of different types of superplasticizers and their possible participation in RC rehydration in RC pastes, in order to gain a deeper understanding of their mechanisms of action in RC paste.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
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Type | Characteristic | Mechanisms | Dosage | Application | Reference |
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Polycarboxylate superplasticizers (PCEs) | This type of superplasticizer is currently the most advanced in technology and has the best application prospects. It has characteristics such as low dosage, high water-reducing efficiency, low slump loss, significant enhancing effect, and is a green and environmentally friendly high-efficiency superplasticizer. | PCEs are adsorbed onto the surface of cement particles through their negatively charged anchoring groups (such as carboxyl groups) to form a thicker adsorption layer, generating electrostatic repulsion and steric hindrance, thereby enhancing the flowability of the cement slurry. | The amount added is low, with a high water-reduction efficiency, typically at 0.5–2.0% of the total weight of the cementitious material. | Suitable for preparing high-durability, high-fluidity, high-slump-retention, and high-strength concrete. | [25,45,46,47] |
Naphthalene sulfonate formaldehyde condensates | A higher water-reducing efficiency (15–25%) can be achieved, no air-entrainment is induced, there is minimal impact on setting time, and it exhibits good compatibility with cement, as well as various other admixtures. Furthermore, it is relatively cost-effective. | By forming complexes with calcium ions on the surface of cement particles through its sulfonate groups, the flowability of the cement slurry is increased. | The amount added is typically 0.2–2.0% of the total weight of the cementitious material, commonly used at 0.2–0.5%. | Applicable for prestressed concrete engineering; can enhance the early strength and later strength of concrete. | [48,49] |
Amine sulfonate superplasticizers | The molecule has a complex structure, containing a large number of hydrophilic functional groups such as sulfonate, amino, hydroxyl, etc., and has a very good water-reducing effect and improves the durability of concrete. | Because its amino and sulfonate groups interact with cement particles, the dispersion and flowability of the cement slurry are improved, while the cement dosage and water requirement are reduced. | The amount added is relatively high, typically at 1.0–3.0% of the total weight of the cementitious material. | Suitable for improving the durability of concrete. | [50,51] |
Aliphatic superplasticizers | The strengthening effect on concrete is obvious, with minimal slump loss. | Having longer carbon chains, it can form a protective film on the surface of cement particles, reducing inter-particle friction, thus improving flowability and reducing water requirements. | The amount added typically ranged from 1.5 to 2.0%. | Applicable for situations where the reinforcement effect on concrete is significant, and the slump loss is minimal. | [52] |
Melamine formaldehyde superplasticizers | The appearance is a white powder, soluble in water, with good dispersibility for powdery materials, a high water-reduction efficiency, and good fluidity and self-healing properties. | By its melamine resin structure interacting with the surface of cement particles, the flowability of the cement slurry is improved, and the cement dosage is reduced. | The amount added varies depending on the product, but is typically 0.5–1.5% of the total weight of the cementitious material. | Applicable for improving poor workability of concrete caused by poor aggregate quality. | [53,54] |
Polyacrylate-type superplasticizers | This type is not only highly efficient in reducing water and improving the concrete structure but can also control the slump loss, is compatible with a variety of cement types, works at a low dosage, and still maintains high mobility. | Increasing the dispersion of cement particles is mainly due to improving the spatial exclusion between the particles and the polyacrylate-type superplasticizers’ air-entraining isolation “ball” effect. | The water decrease rate is as high as 21.3% at a dosage of 0.35% of the total weight of the cementitious material. | Can be applied to many kinds of cement-based concrete. | [55,56,57,58,59,60,61,62] |
Standard | OPC | RC | Reference | |
---|---|---|---|---|
Particle size (μm) | GB175-2023 [69] | <45 | <75–150 | [69,70,71,72] |
Blaine specific surface (m2/kg) | EN 196-6 [73] | 300–450 | 800–4400 | [20,69,74,75] |
Chemical composition | C3S, C2S, C4AF, C3A, gypsum, limestone | Contains more f-CaO and polycrystalline C2S, amorphous AFm phase, but lacks C3S. | [20,69] | |
w/b (water-cement ratio) | EN 196-3 [76] | 0.25–0.35 | 0.5–0.75 | [21,66,69,77,78,79,80,81] |
28-day compressive strength (MPa) | EN 196-1 [82] GB175-2023 [69] | 32.5–62.5 | 3–32 | [7,10,14,69,70,77] |
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Huang, R.; Xu, L.; Xu, Z.; Zhang, Q.; Wang, J. A Review on Concrete Superplasticizers and Their Potential Applications for Enhancing the Performance of Thermally Activated Recycled Cement. Materials 2024, 17, 4170. https://doi.org/10.3390/ma17174170
Huang R, Xu L, Xu Z, Zhang Q, Wang J. A Review on Concrete Superplasticizers and Their Potential Applications for Enhancing the Performance of Thermally Activated Recycled Cement. Materials. 2024; 17(17):4170. https://doi.org/10.3390/ma17174170
Chicago/Turabian StyleHuang, Rong, Lei Xu, Zihang Xu, Qihang Zhang, and Junjie Wang. 2024. "A Review on Concrete Superplasticizers and Their Potential Applications for Enhancing the Performance of Thermally Activated Recycled Cement" Materials 17, no. 17: 4170. https://doi.org/10.3390/ma17174170
APA StyleHuang, R., Xu, L., Xu, Z., Zhang, Q., & Wang, J. (2024). A Review on Concrete Superplasticizers and Their Potential Applications for Enhancing the Performance of Thermally Activated Recycled Cement. Materials, 17(17), 4170. https://doi.org/10.3390/ma17174170