Analysis of the Influence and Mechanism of Diatomaceous Earth Internal Curing on the Autogenous Shrinkage and Early Crack Resistance of Cement-Based Materials with Low Water–Binder Ratio
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials
2.2. Methods
2.2.1. Mechanical Properties Test
2.2.2. Internal Relative Humidity Test
2.2.3. Autogenous Shrinkage Experiment
2.2.4. Ring Anti-Cracking Experiment
2.2.5. Micro-Experiment Methods
3. Results
3.1. Mortar Mix Ratio and Compressive and Flexural Strength
3.2. Variation in Relative Humidity Inside Mortar
3.3. Autogenous Shrinkage Performance of Mortar
3.4. Early Cracking Resistance of Mortar
3.5. The Effect of DE on the Hydration Process of Cement Mortar
3.5.1. The Influence of DE on the Chemically Bound Water Content of Cement Mortar
3.5.2. The Impact of DE on the Phase Composition of Hydration Products in Cement Mortar
3.5.3. Effect of DE on the Micromorphology of Hydration Products of Cement Mortar
3.5.4. Effect of DE on the Pore Structure of Cement Mortar
3.6. Shrinkage Reduction Mechanism of DE
- (1)
- SiO2 and Al2O3 in DE can undergo secondary hydration reactions with Ca(OH)2 to produce hydration products such as C-S-H and expansion-type AFt, compensating for some of the shrinkage. SiO2 and Al2O3 in DE have high contents and can react with Ca(OH)2 to produce ettringite, which prolongs the secondary expansion period of mortar autogenous shrinkage.
- (2)
- Replacing part of the cement with DE reduces the activity of the cementing material, thus reducing autogenous shrinkage from the source. Autogenous shrinkage is caused by the hydration of cementing materials such as cement. Although the main component of DE is silicon dioxide, its limited activity allows it to participate in some hydration reactions.
- (3)
- The slow release of water in DE increases the relative humidity inside the cement mortar and reduces the driving force of autogenous shrinkage. DE contains a large number of tiny pores and has good water absorption and release properties, which enable it to slowly release water during the hardening process of cement mortar, thereby increasing the internal relative humidity of cement mortar (see Figure 4) and reducing the driving force of autogenous shrinkage.
4. Conclusions
- (1)
- The unique natural macroporous/mesoporous structure of DE endows it with excellent water absorption and release properties, which can improve the internal relative humidity of mortar and significantly slow down the decline rate of internal relative humidity. Compared to the benchmark group, when the content of DE is 1%, the saturation duration of the internal humidity of mortar is extended by 3.4%.
- (2)
- Under the standard of not reducing the 28 d compressive strength of mortar, compared to the reference group, the mortar mix proportion of DE replacing 1% cement mass reduces the 3 d autogenous shrinkage value by 30.9% and the 7 d autogenous shrinkage value by 36.7%. In the ring-constrained crack resistance test, the initial cracking time is delayed by 10.7%, and the crack width is reduced by 28%.
- (3)
- The mechanism of DE reducing autogenous shrinkage comprises in three aspects. Firstly, SiO2 and Al2O3 in DE react with Ca(OH)2 to produce expansive ettringite, which compensates for part of the shrinkage. Secondly, DE replaces part of the cement, reducing the activity of cementing materials and thus reducing autogenous shrinkage from the source. Thirdly, the slow release of water from its porous structure can increase the internal relative humidity of mortar and reduce the driving force of autogenous shrinkage.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Chemical Analysis | OPC (%) | DE (%) |
---|---|---|
SiO2 | 21.34 | 71.56 |
Al2O3 | 4.86 | 14.87 |
Fe2O3 | 3.56 | 1.57 |
CaO | 63.92 | 4.16 |
MgO | 1.78 | 4.95 |
Na2O | 0.56 | 1.59 |
Grouping | Actual Water–Binder Ratio (W/C) | Cement/% | DE/% | Water Reducer/% |
---|---|---|---|---|
A1 | 0.35 | 100 | 0 | 0.1 |
A2 | 99 | 1 | 0.11 | |
A3 | 97 | 3 | 0.12 | |
A4 | 95 | 5 | 0.14 |
Grouping | Porosity/% | Average Aperture/nm | Pore Size Distribution/(mL·g−1) | |||
---|---|---|---|---|---|---|
<10 nm | 10–100 nm | 100 nm–1 µm | >1 µm | |||
A1 (28 d) | 14.05 | 19.01 | 0.0136 | 0.0262 | 0.0028 | 0.0267 |
A2 (28 d) | 17.44 | 22.19 | 0.0162 | 0.0236 | 0.0024 | 0.0497 |
A3 (28 d) | 17.88 | 16.47 | 0.0233 | 0.0397 | 0.0034 | 0.0299 |
A4 (28 d) | 17.49 | 13.69 | 0.0257 | 0.0448 | 0.0037 | 0.0176 |
A2 (3 d) | 19.02 | 26.13 | 0.0135 | 0.0419 | 0.0051 | 0.0373 |
A2 (7 d) | 14.38 | 21.52 | 0.0131 | 0.0334 | 0.0033 | 0.0249 |
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Li, S.; Liu, S.; Jiang, C. Analysis of the Influence and Mechanism of Diatomaceous Earth Internal Curing on the Autogenous Shrinkage and Early Crack Resistance of Cement-Based Materials with Low Water–Binder Ratio. Appl. Sci. 2024, 14, 5397. https://doi.org/10.3390/app14135397
Li S, Liu S, Jiang C. Analysis of the Influence and Mechanism of Diatomaceous Earth Internal Curing on the Autogenous Shrinkage and Early Crack Resistance of Cement-Based Materials with Low Water–Binder Ratio. Applied Sciences. 2024; 14(13):5397. https://doi.org/10.3390/app14135397
Chicago/Turabian StyleLi, Shuangxi, Shunyi Liu, and Chunmeng Jiang. 2024. "Analysis of the Influence and Mechanism of Diatomaceous Earth Internal Curing on the Autogenous Shrinkage and Early Crack Resistance of Cement-Based Materials with Low Water–Binder Ratio" Applied Sciences 14, no. 13: 5397. https://doi.org/10.3390/app14135397
APA StyleLi, S., Liu, S., & Jiang, C. (2024). Analysis of the Influence and Mechanism of Diatomaceous Earth Internal Curing on the Autogenous Shrinkage and Early Crack Resistance of Cement-Based Materials with Low Water–Binder Ratio. Applied Sciences, 14(13), 5397. https://doi.org/10.3390/app14135397