Effects of calcium nitrate and triisopropanolamine on the setting and strength evolution of Portland cement pastes

Chikh, Nasr‐Eddine; Zouaoui, Mustapha Cheikh; Aggoun, Salima; Duval, R. M. Pradeilles

doi:10.1617/s11527-006-9215-8

Cited by 38 publications

(11 citation statements)

References 7 publications

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“…At present, the chemical admixture has become a cement-based material, which is an important regulatory component or modification method. Addition of a small amount of admixture, especially organic admixture, can effectively adjust the performance of cement-based materials, such as improving work performance or rheology, speeding up or delaying the hydration rate and coagulation time, and improving the physical and mechanical properties and durability of materials [1][2][3][4][5]. e performance of the admixture has an important relationship with the functional groups in its molecule.…”

Section: Introductionmentioning

confidence: 99%

Influence of Organic Esters on Portland Cement Hydration and Hardening

Zheng

Wang

et al. 2018

Advances in Materials Science and Engineering

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This paper investigated the effect of organic compounds with ester groups on the hydration and hardening of cement. The effects of five kinds of organic compounds with ester groups (ethyl acetate, dimethyl oxalate, glyceryl triacetate, trimethyl phosphate, and triethanolamine borate) on hydration heat, hydration degree, setting time, mechanical properties, microstructure, and pore structure of hardened cement slurry were studied. The test results showed that esters can make the end time of cement hydration induction longer and delay the occurrence of the second exothermic peak. Also, the effect of five kinds of esters on the hydration and hardening of cement was basically followed by TG> TB> DMO> EAC> TMP. In terms of molecular structure, for organic compounds containing only ester groups, the higher the number of ester groups, the greater the effect on the hydration of cement. The introduction of other functional groups (such as phosphate or borate) will influence the effect of the esters.

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Section: Introductionmentioning

confidence: 99%

Influence of Organic Esters on Portland Cement Hydration and Hardening

Zheng

Wang

et al. 2018

Advances in Materials Science and Engineering

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“…This could be attributed to higher content of C 3 S and C 3 A phases in OPC than blended cements as shown in Table 1 . C 3 S hardens rapidly in presence of water hence it is responsible for the early setting of cement paste [ 57 , 58 , 59 ]. Hydration of C 3 A produces significant amount of heat that increase the prevailing setting temperature resulting to faster setting behaviour of OPC compared with blended cements.…”

Section: Resultsmentioning

confidence: 99%

Properties of activated blended cement containing high content of calcined clay

Marangu

Karanja

Muthengia

2018

Heliyon

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This paper presents findings of an experimental investigation on sodium sulphate (Na2SO4) activated calcined clay – Portland cement blends in sulphuric acid media. Calcined clays were blended with Ordinary Portland Cement (OPC) at replacement levels of 40% 45% and 50 % by mass of OPC to make blended cement labelled PCC40, PCC45 and PCC50 respectively. Initially, pozzolanicity and setting time tests were conducted. Mortar prisms measuring 40 mm × 40 mm × 160 mm were cast using 0.5M Na2SO4 solution and their compressive strengths determined on the 2nd, 7th, 28th and 90 th day of curing. The 28th day cured mortar prisms were subjected to porosity test. Moreover, 5 × 5 × 5 cm mortar cubes were also prepared and their weight and strength loss was taken as a measure of their acid resistivity after an immersion time of 7, 14, 28, 56, 84 and 120 days in 3 % of sulphuric acid at 23 ± 1 °C. OPC, commercial Portland Pozzolana Cement (PPC) and PCC40, PCC45 and PCC50 cement were cast using water and similarly investigated for comparison purposes. The results obtained showed that chemically activated cements exhibited higher pozzolanic activity, lower porosity, shorter setting times and higher resistance to acid attack compared to non-activated cements. However, OPC was found to be non-pozzolanic.

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“…24 Belite dissolves slowly to form short CASAH fibers which provide long term strength for the cement and the short CASAH bonds possibly contributed to the high cement strengths for the 5 wt % nitrate modified cements. 50 The early presence of calcium hydroxide was observed in both the XRD and FTIR studies as a by-product of CASAH formation, possibly indicating calcium silicate dissolution that led to early CASAH development. 22,33 Even though the heat signatures of the PC standard and cements containing 5 wt % calcium nitrate were similar, the exotherms for nitrate containing cements were significantly higher (p < 0.001).…”

Section: -39mentioning

confidence: 94%

Development of Portland cement for orthopedic applications, establishing injectability and decreasing setting times

2012

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The injectability of Portland cement (PC) with calcium chloride and calcium nitrate additives was investigated using a syringe with a 2 mm aperture for potential clinical applications such as vertebroplasty. Addition of either additive at 10 wt % increased the quantity of cement extruded through the syringe from approximately 25 wt % for the PC standard, to over 95 wt %. 10 wt % additions of either additive also decreased setting times from over 2 h to below 25 min. The compressive strength of the modified cements was all greater than the compressive strength of a human vertebral body. Decreasing either additive to 5 wt % generated compressive strengths after 24 h setting equal to polymethylmethacrylate, the cement used for the majority of vertebroplasty procedures. An initial early exotherm in the chloride cements was coupled with an X-ray diffraction (XRD) peak that indicated the early formation of the ettringite cement phase. In contrast, Fourier transform infrared (FTIR) spectroscopy and XRD data indicated that calcium nitrate may have stimulated early calcium silicate hydrate (CASAH) production (the main strength producing phase of PC). Combining the two additives produced a synergistic effect with cements having increased injectabilities and compressive strengths compared with either addition used individually. This study has demonstrated that by modifying PC with nonproprietary chemicals it was possible to significantly increase cement injectability and reduce setting times whilst maintaining compressive strengths, making PC suitable for potential orthopedic applications.

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Effects of calcium nitrate and triisopropanolamine on the setting and strength evolution of Portland cement pastes

Cited by 38 publications

References 7 publications

Influence of Organic Esters on Portland Cement Hydration and Hardening

Influence of Organic Esters on Portland Cement Hydration and Hardening

Properties of activated blended cement containing high content of calcined clay

Development of Portland cement for orthopedic applications, establishing injectability and decreasing setting times

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