Synergistic effect of EVA, TEA and C-S-Hs-PCE on the hydration process and mechanical properties of Portland cement paste at early age

Liang, Guangwei; Ni, Dayou; Li, Haoxin; Dong, Bo‐Qing; Yang, Zhenghong

doi:10.1016/j.conbuildmat.2020.121891

Cited by 54 publications

(25 citation statements)

References 56 publications

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“…The bands at 3641, 1459, and 714 cm −1 were related to the presence of CH [ 26 ]. The band at about 1638 cm −1 was related to the formation of Aft [ 30 ], and the bands at 973 cm −1 and 875 cm −1 were attributed to hydrated calcium silicates [ 31 ] and carbonate [ 31 ], respectively.…”

Section: Resultsmentioning

confidence: 99%

Quantitative Analysis of the Calcium Hydroxide Content of EVA-Modified Cement Paste Based on TG-DSC in a Dual Atmosphere

Zhang

Mei-lun

2022

Materials

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The calcium hydroxide (Ca(OH)2) content is one of the main indices of cement hydration degree. In order to accurately determine the calcium hydroxide content of ethylene and vinyl acetate (EVA) copolymer-modified cement paste, a dual atmosphere thermogravimetric method (first in an oxidizing atmosphere and then in an inert atmosphere) was used to track the mass loss and change in enthalpy by TG-DSC (simultaneous thermogravimetry and differential scanning calorimetry). The results showed that using the dual atmosphere thermogravimetric method, the source of mass loss can be distinguished. The exothermic peaks in an oxidizing atmosphere show the oxidation reactions of EVA, while the endothermic peak in an inert atmosphere is due to the pyrolysis reaction of EVA and the decomposition of the calcium hydroxide. The influence of EVA on cement hydration was investigated. The results showed that the polymer powder can be dispersed in water, forming a kind of composite membrane. The test method of dual atmosphere thermogravimetry to measure the calcium hydroxide content of polymer-modified cement pastes is more accurate and convenient than those previously applied.

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Section: Resultsmentioning

confidence: 99%

Quantitative Analysis of the Calcium Hydroxide Content of EVA-Modified Cement Paste Based on TG-DSC in a Dual Atmosphere

Zhang

Mei-lun

2022

Materials

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“…Thus, the partial replacement of PC by CSA not only leads to high early strength but also reduces the environmental impact of the emission of CO 2 from cement production. Many papers have confirmed that a blend of PC and CSA could combine the advantages of both, e.g., excellent early strength, great dimensional stability, good durability, low shrinkage, and green features [ 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 ], effectively creating a potential cementitious material for precast concrete and winter construction. Moreover, in the blend of PC and CSA, the increase in CSA percentage facilitates the rapid early strength development of this blend [ 33 ].…”

Section: Introductionmentioning

confidence: 99%

“…However, the high-quality bauxite (the raw material of ye’elimite) gradually reduces after the development of more than 50 years, leading to the cost of CSA elevating [ 29 ]. In addition, the excessively rapid generation of ettringite might aggravate the pore structure, damaging the hardening density of the PC-CSA matrix [ 34 ]. Therefore, the percentage of CSA is often limited to less than 10% of the total cementitious material, which keeps the costs competitive and compactness of PC-CSA binder but may limit the degree of early strength enhancement.…”

Section: Introductionmentioning

confidence: 99%

“…As a result, in this paper, a PC-CSA binder consisting of PC clinker (90%), CSA clinker (5%), and anhydrite (5%) was designed, due to the cost competition and the greatest potential for applications of this ration of the PC-CSA binder [ 34 ]. Meanwhile, different dosages of NCS on the early compressive strength of the PC-CSA binder were investigated and compared to its effect in PC, aiming to explore the synergistic effect of CSA and NCS.…”

Section: Introductionmentioning

confidence: 99%

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Synergistic Effect and Mechanism of Nano-C-S-H Seed and Calcium Sulfoaluminate Cement on the Early Mechanical Properties of Portland Cement

et al. 2023

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The combined utilization of mineral accelerators and nano-seeding materials is a novel method to promote the early strength of cement-based materials. In this paper, the effects of nano-C-S-H seed (NCS) on the early compressive strength of the Portland cement (PC)– calcium sulfoaluminate cement (CSA) binder were investigated. The results showed that NCS and CSA synergistically contributed to the early strength of PC. In detail, a 326.3% increase in the 10 h compressive strength of PC paste was obtained through the addition of NCS (2 wt%) and CSA (5%) in common. This was higher than the sum of the increases observed with the single additions of CSA (157.9%) or NCS (87.6%), with the same above dosage, in PC. Meanwhile, the early strength enhancement effects of NCS and CSA, when used together in PC, lasted longer than the effects of either used alone. Moreover, the synergetic effect mechanism was analyzed by isothermal calorimeter, QXRD, TGA, MIP, and SEM techniques. The calorimetry, XRD, and TGA results demonstrated that the synergistic mechanism was associated with the synergistic promotion effects of CSA and NCS on the hydrates. The fast hydration of CSA produced large amounts of ettringite and also consumed partial free water to promote the performance of the seeding effect of NCS which, simultaneously, further accelerated the precipitation of C-S-H gel and CH. The high alkie environment was also beneficial for the continuous generation of ettringite. In addition, the results of MIP and SEM measurements showed that the micro-filling effect of NCS significantly optimized the pore structure of a PC-CSA blend-hardened paste. Thus, the synergistic strength enhancement effects of CSA and NCS on PC were attributed to the matching of the promotion of hydration generation and the optimization of pore structures in hardening cement paste. The results of this article provide a new approach to achieving the rapid development of the early strength of cementitious materials, with potential applications in precast concrete and low-temperature construction.

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“…It is attractive to find solutions to tailor the performance of cementitious materials accurately in scientific and engineering society [ 1 , 2 , 3 ]. The development of nanotechnology provides the possibility of improving the macroscopic performance of concrete by regulating the hydration products at micro and even nano-level [ 2 , 3 , 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

Identification of Chemical Bonds and Microstructure of Hydrated Tricalcium Silicate (C3S) by a Coupled Micro-Raman/BSE-EDS Evaluation

et al. 2021

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Identifying the phase evolution and revealing the chemical bonds of hydrated cements accurately is crucial to regulate the performance of cementitious materials. In this paper, a coupled Raman/BSE-EDS analysis was proposed to determine the chemical bonds of tricalcium silicate hydrates and the interface transition zone (ITZ) between inner C-S-H and anhydrates. The results show that the Raman/BSE-EDS method can accurately identify the chemical bonds of inner C-S-H and inner ITZ regions, which confirms the mixed structure of inner C-S-H and nano calcium hydroxide (CH). The inner ITZ shows a lattice change region with a thickness of 700–1000 nm, which can be attributed to the pre-disassembly process of C3S crystal. The successful application of coupled Raman/BSE-EDS provides new insight into the hydration process and multi-structure features of traditional cementitious materials.

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Synergistic effect of EVA, TEA and C-S-Hs-PCE on the hydration process and mechanical properties of Portland cement paste at early age

Cited by 54 publications

References 56 publications

Quantitative Analysis of the Calcium Hydroxide Content of EVA-Modified Cement Paste Based on TG-DSC in a Dual Atmosphere

Quantitative Analysis of the Calcium Hydroxide Content of EVA-Modified Cement Paste Based on TG-DSC in a Dual Atmosphere

Synergistic Effect and Mechanism of Nano-C-S-H Seed and Calcium Sulfoaluminate Cement on the Early Mechanical Properties of Portland Cement

Identification of Chemical Bonds and Microstructure of Hydrated Tricalcium Silicate (C3S) by a Coupled Micro-Raman/BSE-EDS Evaluation

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