Детальная информация
| Название | Cementless binder based on high-calcium fly ash with calcium nitrate additive // Magazine of Civil Engineering. – 2023. – № 8 (124). — С. 12405 |
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| Авторы | Usanova K. Yu. ; Barabanshchikov Yu. G. ; Dixit S. |
| Выходные сведения | 2023 |
| Коллекция | Общая коллекция |
| Тематика | Строительство ; Строительные материалы и изделия ; cement-free binder ; volatile ash (construction) ; high-calcium volatile ash ; calcium nitrate ; silica smoke ; heat dissipation ; бесцементное вяжущее ; летучие золы (строительство) ; высококальциевые летучие золы ; нитрат кальция ; кремнеземный дым ; тепловыделение |
| УДК | 691 |
| ББК | 38.3 |
| Тип документа | Статья, доклад |
| Язык | Английский |
| DOI | 10.34910/MCE.124.5 |
| Права доступа | Свободный доступ из сети Интернет (чтение, печать, копирование) |
| Ключ записи | RU\SPSTU\edoc\72600 |
| Дата создания записи | 13.03.2024 |
Fly ash from Berezovskaya Thermal Power Plant, containing a lot of CaO, in combination with silica fume does not expand and exhibits the properties of a binder. However, the strength of this binder is low. The addition of Ca(NO[3])[2] significantly increases the strength of the binder. The work aims to study the effect of Ca(NO[3])[2] additive on the strength, heat of hydration, and phase composition of hydration products of the binder based on high-calcium fly ash and silica fume. The results of X-ray diffraction and Differential Thermal Analysis show that the main phases formed during the hydration of binder with the calcium nitrate additive in various dosages are lime, calcium hydroxide, ettringite, CSH(II) type silicates and calcium aluminosilicates, corresponding to such minerals as gismondine, yugavaralite, goosecreekite. When hardening in water, the residual amount of lime after 7 days is sharply reduced. An increase in the dosage of Ca(NO[3])[2] from 1.5 to 11.8 % leads to a decrease in the CaO content by almost 2 times. With an increase in the dosage of calcium nitrate, the content of portlandite noticeably decreases, and a significant increase in the amount of calcium hydroaluminosilicates, especially the composition of CAS[2]H[4], is observed. A study of the heat release process showed that calcium nitrate greatly accelerates the process in the first 60 minutes of hydration. However, then the composition with the addition of Ca(NO[3])[2] is inferior in the rate of heat release to binder without the additive. When testing a mortar with polyfractional sand, the addition of Ca(NO[3])[2] more than doubled the compressive strength of the mortar.
| Место доступа | Группа пользователей | Действие |
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| Локальная сеть ИБК СПбПУ | Все |
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| Интернет | Все |
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- Cementless binder based on high-calcium fly ash with calcium nitrate additive
- 1. Introduction
- 2. Materials and Methods
- 2.1. Characteristics of Fly Ash Collected from Electrostatic Precipitators
- 2.2. Determination of Compressive Strength
- 2.3. Influence of Calcium Nitrate on Phase Composition of Hydration Products of Fly Ash-Silica Fume Binder
- 2.4. Influence of Calcium Nitrate on Heat release of Fly Ash-Silica Fume Binder
- 3. Results and Discussion
- 3.1. Compressive strength test results
- 3.2. Results of X-ray diffraction analysis
- 3.3. Results of differential thermal analysis
- 3.4. Results of Heat Release Determination
- 3.5. Influence of Calcium Nitrate on Strength of mortar consisting of Fly Ash and Sand
- 4. Conclusions
