The influence of two types of alkali activators on the microstructure and performance of supersulfated cement concrete： mitigating the strength and carbonation resistance

Zhou, Yang; Peng, Zechuan; Yao, Xueqing; Huang, Jiale

doi:10.1016/j.cemconcomp.2021.103947

Cited by 57 publications

(20 citation statements)

References 39 publications

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“…Although SSC has many of these excellent properties, its promotion is still immature. The main reasons are attributed to the long setting time [1,2], slow early strength development [11,12], and poor carbonation resistance [3,13] of the SSC. The setting time of SSC is prolonged by 2 -3 h, compared with traditional Portland cement.…”

Section: S 3 a + Ch + 3csmentioning

confidence: 99%

“…The alkali activator is one of the key factors affecting the performance of SSC. Zhou et al [3] investigated the effects of alkali activators (lactates and sodium hydroxyl) on the microstructure and properties of SSC concrete. It was found that the addition of lactate affects the hydration of the slag, resulting in more calcium alumina and a denser microstructure of the persulfate cement concrete, while sodium hydroxyl failed to improve the microstructure of the SSC concrete.…”

Section: S 3 a + Ch + 3csmentioning

confidence: 99%

“…Super sulfated cement (SSC) is a kind of green cementitious material with slag (75 -85 %) as the main constituent, gypsum (10 -20 %) as the sulfate activator and clinker or lime as the alkaline activator (1 -5 %), which produces a lower CO 2 footprint during its production [1,2]. Therefore, SSC is considered as an alternative to Portland cement [3]. The hydration process of SSC is demonstrated in Equation 1 [4,5].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Calcium Hydroxide on the Microstructure and Performance of Super Sulfated Cement

Zhou¹

2022

Ceramics - Silikaty

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The effects of a 0, 0.2 wt. %, 0.6 wt. %, 1.0 wt. %, 1.4 wt. % and 1.8 wt. % calcium hydroxide content on the microstructure and performance of super sulfated cement (SSC) were investigated. The results showed that the setting time of SSC could be reduced by the calcium hydroxide content to less than 7 hours. The variation in the setting time did not affect the working performance of the SSC. The mechanical properties of the SSC can be consistently and gradually enhanced by calcium hydroxide. The SSC, with a 3-day compressive strength of 22.3 MPa and a 28-day compressive strength of 45.1 MPa, was prepared by introducing 0.6 wt. % calcium hydroxide into the system. A microanalysis revealed that the reaction mechanism of the SSC was influenced by the calcium hydroxide, which led to changes in the hydration products as well as the structure. In particular, large amounts of ettringite (AFt) were prompted in the SSC prepared with the raw materials at the early stage. The change in the structure of the hydration products led to a significant improvement in the mechanical properties.

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Section: S 3 a + Ch + 3csmentioning

confidence: 99%

Section: S 3 a + Ch + 3csmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Calcium Hydroxide on the Microstructure and Performance of Super Sulfated Cement

Zhou¹

2022

Ceramics - Silikaty

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“…According to the industrial standards and the references of relevant literature (Peng et al, 2019;Zhou et al, 2021), the P.O. 42.5 ordinary Portland cement produced in Huainan City, and the white-color metakaolin with about 1.8 μm average particle size produced by Shanghai Lingdong Company were applied in this test.…”

Section: Test Process Raw Materials Of Testmentioning

confidence: 99%

Study on Metakaolin Impact on Concrete Performance of Resisting Complex Ions Corrosion

2021

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The main purpose of this study is to determine the metakaolin (MK) impacts on the concrete durability when the concrete is subjected to joint corrosion of SO42−,Mg2+ and, Cl−. Four groups of concrete test samples, which contained different MK contents, were designed and tested in order to see their physical property changes and macro-morphology differences during the cyclic corrosion process. And a series of approaches, including XRD, FTIR, SEM, and EDS, were applied to study the concrete phase composition changes and the micro-morphology features of all groups. According to the test results, when reaching 20 cycles, the concrete sample with 10% MK showed the best concrete physical properties; when reaching 120 cycles, the concrete with 5% MK content showed the best durability, produced similar amount of corrosion products to ordinary concrete, and presented relatively compacted micro-structure and small internal porosity. Mg2+ actually has a great impact on metakaolin. The corrosion product quantity increased significantly when MK admixture reached 15%. Due to the great number of produced M-S-H, the corrosive ions damaged the concrete for a second time, leading to serious aggregate peeling-off, powder surface of test samples, and porous micro-structure.

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“…The preparation of SSC features low energy consumption and CO 2 emission because calcination is unnecessary in the production process. SSC is an energy-saving and environmentally friendly material that contains limited or no clinkers, and its general components include slag (75 -85 %), sulfate [1,2] (10 -20 %), and alkaline components (clinker or alkali activator [3,4]). [2,5,6] SSC integrates the advantages of lowhydration heat release, microexpansion, and high sulfate corrosion resistance [7,8] but its poor mechanical property [4] restricts its promotion and application to a certain extent.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Modified Supersulfated Cement Mortar

Dong¹

2021

Ceramics - Silikaty

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Supersulfated cement (SSC) is a green and environmentally friendly material that contains limited or no clinkers, with lowhydration heat release and favorable sulfate corrosion resistance. However, SSC requires modification because its poor mechanical property has restricted its promotion and application to a certain extent. Mix proportion design and mechanical properties of Bayer red mud and water glass-modified SSC were explored in this study, and the results were discussed by microanalysis. Results showed that the increase of red mud content prolongs the setting time of SSC, thereby indicating that early-stage mechanical properties (within 3 days), especially ultraearly-stage mechanical properties (within hours), need further improvement. However, mechanical properties of SSC mortar at different stages improve after three days, and further improve with the simultaneous addition of water glass and red mud. The optimal mix proportion of SSC obtained using Taguchi method is presented as follows: slag (70 wt. %), gypsum (15 wt. %), OPC (5 wt. %), red mud (10 wt. %), and water glass with a modulus of 1.8 (2.0 wt. %). Meanwhile, the compressive strength of specimen at this mix proportion reaches 42.12 MPa at 28 d. Mechanical properties improve because system alkalinity is further enhanced, additional gel products are generated, and the hardened body presents a tight binding state due to the simultaneous addition of red mud and water glass.

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The influence of two types of alkali activators on the microstructure and performance of supersulfated cement concrete： mitigating the strength and carbonation resistance

Cited by 57 publications

References 39 publications

Effect of Calcium Hydroxide on the Microstructure and Performance of Super Sulfated Cement

Effect of Calcium Hydroxide on the Microstructure and Performance of Super Sulfated Cement

Study on Metakaolin Impact on Concrete Performance of Resisting Complex Ions Corrosion

Mechanical Properties of Modified Supersulfated Cement Mortar

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