Calcination of green high-belite sulphoaluminate cement (GHSC) and performance optimizations of GHSC-based foamed concrete

Liu, Chao; Luo, Jianlin; Li, Qiuyi; Gao, Song; Su, Dunlei; Zhang, Jigang; Chen, Shuaichao

doi:10.1016/j.matdes.2019.107986

Cited by 43 publications

(10 citation statements)

References 43 publications

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“…In addition, 20 mm cube specimens were produced to represent the SAC paste so as to understand the dehydration phase that occurs as the temperature increases [11]. These specimens were demoulded after 24 hours; they were then cured in a curing room with standard humidity and temperature for 28 days [12]. The rapid-hardening sulfoaluminate cement R.SAC-42.5 was used for all the preparations; its oxide composition is shown in Table 1.…”

Section: Experimental Materials and MIX Designmentioning

confidence: 99%

Compressive Strength of Rapid Sulfoaluminate Cement Concrete Exposed to Elevated Temperatures

Tchekwagep¹

2020

Ceramics - Silikaty

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The compressive strength, modulus and stress-strain behaviour of rapid-hardening sulfoaluminate cement concrete were evaluated as functions of the temperature increase. The compressive strength decreased from 51.3 to 31.1 MPa (around a 39 % reduction) as the temperature increased from 20 °C to 300 °C while the specimens burst at 400 °C before being removed from the furnace. A significant change in the stress-strain behaviour was noticed with an increasing temperature. For the control specimens (20 °C), linear elastic behaviour was followed by plastic deformation before reaching the peak stress prior to failure, but for higher temperatures, the modulus of elasticity was up to 85 % lower and was characterised by a gradually decreasing slope until failure. The micro-structural changes detected by SEM, DTG/TG and XRD were consistent with this pattern. The degree of cracking at the interfacial transition zone and crack-width growth detected by SEM followed a clear trend with the increasing temperature. The transformation of the primary hydration products (e.g., ettringite and Al(OH) 3) as detected by XRD and DTG/TG provides a useful explanation of the strength reduction with the increasing temperature up to 300 °C. The vapour pressure evolvement within the specimens at elevated temperatures correlates well with the reduced strength and modulus of elasticity, with a very intense effect at 400 °C.

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Section: Experimental Materials and MIX Designmentioning

confidence: 99%

Compressive Strength of Rapid Sulfoaluminate Cement Concrete Exposed to Elevated Temperatures

Tchekwagep¹

2020

Ceramics - Silikaty

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“…High-belite sulphoaluminate cement is a kind of green cement [30,31] that consumes less energy and emits less CO 2 in the preparation process. At the same time, properties such as quick setting and hardening, low hydration heat and excellent permeability resistance make high-belite sulphoaluminate cement widely useful in many fields, such as road rapid repair.…”

Section: Introductionmentioning

confidence: 99%

Study on the Influence of Nanosilica Sol on the Hydration Process of Different Kinds of Cement and Mortar Properties

Liu

et al. 2021

Materials

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Compared with nanosilica collected in a gaseous state, nanosilica sol has great economic value and application significance for improving the performance of concrete and mortar. In this study, the influence of nanosilica sol on the hydration process of different kinds of cement is studied by means of hydration heat analysis,X-ray diffraction analysis(XRD)and other methods, and the properties of mortar such as setting time, mechanical properties and porosity are also studied to characterize the influence of nanosilica sol on the macroscopic properties of mortar. The experimental results show that nanosilica sol can accelerate the hydration rate of two kinds of cement and promote the hydration reaction degree of cement, and this promotion effect increases with the increase in nanosilica sol content. At the same time, nanosilica sol can significantly shorten the setting time of the two kinds of cement, and it is more obvious with the increase in content. Excessive content of nanosilica sol will adversely affect the permeability resistance of mortar. It may be caused by the weak interval formed by nanosilica particle clusters in the mortar matrix, which can be supported by the mortar pore structure distribution test. At the same time, the influence of nanosilica sol on the hydration of the two kinds of cement is different, and the compressive strength of HBSAC cement mortar increases first and then decreases after adding nanosilica sol; However, the compressive strength of P·O 42.5 cement mortar increases gradually after adding nanometer silica sol. This shows that nanosilica sol does not effectively promote the hydration of β-C2S in high belite sulfoaluminate cement (HBSAC) mortar. Based on the above experimental results, it can be concluded that when the content of nanosilica sol is about 1%, it has the best promotion effect on the hydration of the two kinds of cement and the performance of mortar.

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“…High belite sulphoaluminate cement (HBSAC) is a variant of SAC developed from SAC. It has the same green characteristics of low energy consumption and low emission as SAC, and its green degree is further improved compared with SAC because it uses a large amount of industrial waste slag and low-grade limestone to replace high-grade bauxite and limestone [34,35].…”

Section: Introductionmentioning

confidence: 99%

Study on the Performance of Synergistic Preparation of Sulphoaluminate Based Recycled Concrete by RP and RCA

Guo

et al. 2021

Crystals

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In this paper, the properties of sulphoaluminate based recycled concrete, with high workability and low and medium strength, prepared by recycled powder (RP), recycled coarse aggregate (RCA), and high belite sulphoaluminate cement (HBSAC), were systematically studied. Under the condition of a water binder ratio of 0.45, sulphoaluminate based recycled concrete, with different mix proportions, was prepared by replacing sulphoaluminate cement with RP and natural coarse aggregate (NCA) with RCA. The workability, mechanical properties, durability, and hydration products of the prepared concrete were analyzed. The results showed that when RP and RCA were used together, the workability of recycled concrete could fully meet the pumping demand in actual construction. When the mass replacement rate of RP was less than 30% and that of RCA was less than 20%, the strength of recycled concrete could completely reach the design strength grade, while those that did not reach the design strength grade could reach the next grade. The durability performance was also good.

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Calcination of green high-belite sulphoaluminate cement (GHSC) and performance optimizations of GHSC-based foamed concrete

Cited by 43 publications

References 43 publications

Compressive Strength of Rapid Sulfoaluminate Cement Concrete Exposed to Elevated Temperatures

Compressive Strength of Rapid Sulfoaluminate Cement Concrete Exposed to Elevated Temperatures

Study on the Influence of Nanosilica Sol on the Hydration Process of Different Kinds of Cement and Mortar Properties

Study on the Performance of Synergistic Preparation of Sulphoaluminate Based Recycled Concrete by RP and RCA

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