Hydration, shrinkage, pore structure and fractal dimension of silica fume modified low heat Portland cement-based materials

Wang, Lei; Jin, Minmin; Wu, Yonghua; Zhou, Yue; Tang, Shengwen

doi:10.1016/j.conbuildmat.2020.121952

Cited by 178 publications

(49 citation statements)

References 59 publications

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“…In contrast, the cumulative hydration heat of the BPC-0SAP samples was much lower compared to the control group. This was due to the fact that the early C 2 S hydration reaction was slower than C 3 S, releasing less hydration heat [33]. The cumulative hydration heat was released at 72 h and reduced by 15.9% compared to the control group.…”

Section: Isothermal Calorimetrymentioning

confidence: 95%

“…This was attributed to the slow hydration rate of C 2 S in BPC-0SAP, resulting in a slow increase in strength in the early stages [32]. Although the early compressive strength developed slowly due to the higher C 2 S and lower C 3 A in the BPC cement, the later (28 days) strength was significantly improved [33]. The compressive strength of BPC-0SAP samples at 28 days could reach 96.2% of the control group.…”

Section: Compressive Strengthmentioning

confidence: 99%

“…As shown in Figure 5, the development of AS can be divided into the following three stages: rapid growth period at initial ages, stable period at middle ages, and continuous growth period at later ages. There are five reasons for the change in AS: (i) cement hydration consumes water and the internal relative humidity decreases, resulting in a rapid increase in AS (shrinkage factor) [12]; (ii) the densification of the internal pore structure, resulting in increased AS (shrinkage factor) [33]; (iii) the pozzolanic reaction of silica fume and slag to produce dense C-S-H, as well as to promote AS development (i.e., shrinkage factor) [34]; (iv) the production of AFm and internal temperature changes leading to expansion (expansion factor) [35]; (V) limestone stabilizes the produced ettringite and causes expansion (expansion factor) [36,37]. The final macroresponse depends on changes in the dominant expansion and contraction factors.…”

Section: Autogenous Shrinkage (As) Coupled With Internal Relative Humidity and Temperaturementioning

confidence: 99%

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Effect of Cement Types and Superabsorbent Polymers on the Properties of Sustainable Ultra-High-Performance Paste

Xuan

Wang

et al. 2021

Materials

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This study focuses on the effects of superabsorbent polymers (SAP) and belite-rich Portland cement (BPC) on the compressive strength, autogenous shrinkage (AS), and micro- and macroscopic performance of sustainable, ultra-high-performance paste (SUHPP). Several experimental studies were conducted, including compressive strength, AS, isothermal calorimetry, X-ray diffraction (XRD), thermogravimetric analysis (TGA), attenuated total reflectance (ATR)–Fourier-transform infrared spectroscopy (FTIR), ultra-sonic pulse velocity (UPV), and electrical resistivity. The following conclusions can be made based on the experimental results: (1) a small amount of SAP has a strength promotion effect during the first 3 days, while BPC can significantly improve the strength over the following 28 days. (2) SAP slows down the internal relative humidity reduction and effectively reduces the development of AS. BPC specimens show a lower AS than other specimens. The AS shows a linear relationship with the internal relative humidity. (3) Specimens with SAP possess higher cumulative hydration heat than control specimens. The slow hydration rate in the BPC effectively reduces the exothermic heat. (4) With the increase in SAP, the calcium hydroxide (CH) and combined water content increases, and SAP thus improves the effect on cement hydration. The contents of CH and combined water in BPC specimens are lower than those in the ordinary Portland cement (OPC) specimen. (5) All samples display rapid hydration of the cement in the first 3 days, with a high rate of UPV development. Strength is an exponential function of UPVs. (6) The electrical resistivity is reduced due to the increase in porosity caused by the release of water from SAP. From 3 to 28 days, BPC specimens show a greater increment in electrical resistivity than other specimens.

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Section: Isothermal Calorimetrymentioning

confidence: 95%

Section: Compressive Strengthmentioning

confidence: 99%

Section: Autogenous Shrinkage (As) Coupled With Internal Relative Humidity and Temperaturementioning

confidence: 99%

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Effect of Cement Types and Superabsorbent Polymers on the Properties of Sustainable Ultra-High-Performance Paste

Xuan

Wang

et al. 2021

Materials

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“…It is well known that cracks produced by concrete during service endanger the safety and durability of structures. To this end, scientists and technicians have carried out fruitful research on the causes of cracks, cracking mechanisms, anti-cracking measures, and evaluation of anti-cracking effect from the aspects of raw materials, mix proportion, structural design, construction methods, and service environment (Nagataki and Gomi, 1998;Wang et al, 2021a;Kabir and Hooton, 2020;Chen et al, 2011b;Li and Burrows, 2013;Qureshi et al, 2018;Qureshi et al, 2019;Wang et al, 2020b;Wang et al, 2021b). In particular, scientific and technical personnel have conducted a large number of pioneering creative studies on the performance and production of magnesium oxide expansion agent (MgO) used in cement mortar and concrete (Liu et al, 1991;Gao et al, 2008;Li et al, 2010;Cao et al, 2018b), the performance of cement-based materials containing MgO (Li 1999a;Chen et al, 2010;Lu et al, 2011;Sherir et al, 2016;Sherir et al, 2017;Chen et al, 2017a;Liu et al, 2019;Wang et al, 2020a;Cao and Yan, 2019), and the expansion mechanism of MgO mortar and concrete (Mehta and Pirtz, 1980;Chatterji 1995;Deng et al, 1990;Cao et al, 2018b).…”

Section: Introductionmentioning

confidence: 99%

Influence of Specimen Size on Autogenous Volume Deformation of Long-Aged MgO-Admixed Concrete

et al. 2021

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The transformation law of autogenous volume deformation of MgO-admixed concrete with specimen size was revealed through continuous observation on standard-size (Φ200 mm × 500 mm), medium-size (Φ250 mm × 500 mm), and large-size specimens (Φ250 mm × 600 mm) over 6 years. Besides, the pore parameters of concrete core samples obtained from autogenous volume deformation specimens in the 1st, 3rd, and 6th years of age were investigated. The results show that the autogenous volume deformation of MgO-admixed concrete increases with the increase in the MgO content or age. The expansion rate of the concrete specimen decreases after the age of 360 days, and the autogenous volume expansion deformation of the specimen tends to be stable after about 2 years. When the size of the specimen changes, the autogenous volume deformation of MgO-admixed concrete decreases with the increase of specimen size. During the age of 2–6 years, the expansion of medium- and large-size specimens is reduced by 6–10 and 15–20%, respectively, compared with the standard-size specimens under the same MgO content. With the condition of an appropriate MgO content, regardless of the size of the specimen, the pore structure of the concrete becomes better and better with the growth of age, the concrete becomes denser and denser, and the expansion caused by MgO hydration will not cause damage to concrete structures.

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“…Development of advanced and effective experimental techniques during the last decade, such as X-ray diffraction(XRD) (Ruan and Unluer, 2017), thermogravimetry analysis (TG) (Lv et al, 2020), scanning electron microscopy (SEM) (Wang et al, 2021a), infrared spectroscopy (IR) (Hou et al, 2020;Li et al, 2021), air void analyzer (Wang et al, 2021b), nanoindentation (Lv et al, 2021), mercury intrusion porosimetry (MIP) (Wang et al, 2021c), and nuclear magnetic resonance (NMR) (Wang et al, 2020), has revealed that the micro-scale properties of materials have a significant effect on their macro-scale properties. However, traditional technologies have not been able to keep up with the increasing complexity of the cementitious materials.…”

Section: Introductionmentioning

confidence: 99%

Editorial: New Technologies for Investigating Microstructures and Enhancing Performance of Cementitious Materials

et al. 2021

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Hydration, shrinkage, pore structure and fractal dimension of silica fume modified low heat Portland cement-based materials

Cited by 178 publications

References 59 publications

Effect of Cement Types and Superabsorbent Polymers on the Properties of Sustainable Ultra-High-Performance Paste

Effect of Cement Types and Superabsorbent Polymers on the Properties of Sustainable Ultra-High-Performance Paste

Influence of Specimen Size on Autogenous Volume Deformation of Long-Aged MgO-Admixed Concrete

Editorial: New Technologies for Investigating Microstructures and Enhancing Performance of Cementitious Materials

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