Chemical and thixotropic contribution to the structural build-up of cementitious materials

Zhang, Kun; Mezhov, Alexander; Schmidt, Wolfram

doi:10.1016/j.conbuildmat.2022.128307

Cited by 16 publications

(17 citation statements)

References 44 publications

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“…The structural build-up of cement-based materials describes the increase in rheological parameters with resting time [1][2][3][4][5][6][7][8][9]. It originates from flocculation and the bridging effect of C-S-H between cement particles [2,10].…”

Section: Introductionmentioning

confidence: 99%

“…Different approaches can be used to quantify structural build-up [1,3,7,11,[15][16][17]. A preliminary approach consists of the measurement of the hysteresis loop [1,3,7,11,[15][16][17], which represents the surface between the ascending and descending flow curve. However, this method has several limitations as reported already by Banfill [15,18].…”

Section: Introductionmentioning

confidence: 99%

“…The structural build-up of cementitious materials has been the subject of a large number of studies [1][2][3][4]6,8,11,20]. However, some questions are not clearly elucidated.…”

Section: Introductionmentioning

confidence: 99%

“…Zhang et al [3] found that the chemical contribution is negligible until the acceleration period of hydration. Chemical structural build-up significantly increases from the onset of the acceleration period and remains constant regardless of the hydration time.…”

Section: Introductionmentioning

confidence: 99%

“…Chemical structural build-up significantly increases from the onset of the acceleration period and remains constant regardless of the hydration time. The addition of a superplasticizer (SP) allows for reduction of the flocculation contribution while the chemical contribution is comparable with and without SP [3]. For this investigation, it was considered that re-agitation before testing can erase the flocculation contribution.…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Temperature on the Structural Build-Up of Cement Pastes

El Bitouri

2023

CivilEng

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The structural build-up of cementitious materials is the subject of more and more attention since it conditions several processes such as formwork pressure and multi-layer casting. However, this phenomenon originating from flocculation and chemical changes is complex and its reversibility is not clearly elucidated. The aim of this paper is to examine the effect of temperature on the reversibility of structural build-up. The results show that irreversible structural build-up remains negligible despite a rise in temperature. It represents between 0.5–7.3% of the total structural build-up. The addition of SCMs allows for a decrease in this irreversible structural build-up. Therefore, a large part of the chemical contribution is expected to be reversible. The effect of temperature can be explained by the increase in the dissolution rate leading to an increase in flocculation and to the bridging effect induced by early hydrates. Finally, the results suggest that the interparticle distance could be the key parameter governing the irreversibility of structural build-up.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…The structural build-up of cementitious materials has been the subject of a large number of studies [1][2][3][4]6,8,11,20]. However, some questions are not clearly elucidated.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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