A novel early strength agent prepared by wet-grinding concrete waste slurry and its effect on early hydration and mechanical properties of cement based materials

Su, Ying; Wu, Lei; He, Xingyang; Zheng, Zhengqi; Tan, Hongbo; Yang, Jin; Ma, Qinghong; Ding, Jingjing; Bao, Ming

doi:10.1016/j.conbuildmat.2022.129673

Cited by 12 publications

(3 citation statements)

References 61 publications

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“…However, this expedited process encounters notable challenges, especially under wintry conditions, where the concrete's hydration process, crucial for strength development, is impeded by low temperatures. This poses a significant risk to attaining the minimum compressive strength of 10 MPa required for the safe handling of prefabricated panels [13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Early-Age Compressive Strength in Winter Prefabrication: A Comparative Study

Haddad,

Alassaad,

Sebaibi

2024

Applied Sciences

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In the field of prefabrication, the timely demolding of concrete elements is crucial to prevent structural failures during panel lifting. This study investigates the early-age compressive strength of different concrete mixtures by simulating various prefabrication plant scenarios. Special attention is given to winter conditions, where concrete hydration tends to be slower, potentially compromising the minimum compressive strength requirement of 10 MPa. The first scenario (reference), set at an ambient temperature of 20 °C with raw materials at room temperature, establishes the baseline for comparison. Two alternative dispositions are explored: Scenario 2, with an external temperature of 8 °C and the water for mixing at 35 °C, and Scenario 3, with the same external temperature but utilizing a heating hood to maintain the concrete at 35 °C. The experimental results shed light on the effectiveness of different strategies in achieving the desired early-age compressive strength under winter conditions. The use of warm mixing water and heating hoods are evaluated as potential measures to counteract the hydration slowdown. The findings contribute valuable insights for optimizing prefabrication processes in cold weather, ensuring the structural integrity of precast concrete elements.

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Section: Introductionmentioning

confidence: 99%

Evaluation of Early-Age Compressive Strength in Winter Prefabrication: A Comparative Study

Haddad,

Alassaad,

Sebaibi

2024

Applied Sciences

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“…The wet-grinding process can also effectively grind large particle materials and usually has a better grinding efficiency and effect [ 15 , 16 , 17 ]. Micro-nanoparticles can be obtained by wet grinding CSW, and these fine wet grinding concrete slurry waste (WCSW) particles can be used as excellent auxiliary cementitious materials [ 18 , 19 ]. In the complex hydration and hardening process of cement-based materials, the addition of auxiliary cementitious materials can usually play a modifying role; in particular, the addition of fine auxiliary cementitious materials is more beneficial for optimizing the properties of cement-based materials [ 20 , 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Wet Grinding Concrete Slurry Waste on Hydration and Hardening Properties of Cement: Micro-Nano-Scale Modification

Liu,

Sun,

Huang

et al. 2024

Materials

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The concrete slurry waste (CSW) produced by concrete mixing plants is a type of hazardous waste that is difficult to handle. To better recycle the CSW separated from the aggregates, this study uses a variety of wet-grinding processes to refine the solid in it, replaces some of the cement with the solid particles in wet grinding concrete slurry waste (WCSW), and investigates the properties of WCSW and its effect on the hydration and hardening properties of cement. The results show that a suitable wet-grinding process can ensure that the particle size in WCSW is less than 10 μm, the particle morphology is more flat, and the degree of hydration is higher. The WCSW particles can promote early cement hydration; after adding WCSW, the heat release peak of cement hydration appears earlier and more early hydration products are produced, and with the increase in the substitution amount, the promoting effect on early cement hydration will be more significant. The WCSW particles have a great effect on improving the strength of mortar, especially in the early stage. At 1 d, when the substitution amount is 7.5 wt.%, the compressive and flexural strength is increased by 43.67% and 45.04%; this is related to the filling of matrix pores and the improvement of the interface transition zone by micro- and nanoparticles. After the wet grinding of CSW, fine WCSW particles are obtained, which can improve the performance of cement-based materials by replacing cement.

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“…When compressive strength at an early age does not meet a practical requirement, some strength promotion methods need to be used [ 16 , 17 , 18 ]. A commonly used method is to add some materials to promote early age compressive strength, which can avoid or reduce additional maintenance measures simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Development and Promotion of Concrete Strength at Initial 24 Hours

et al. 2023

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Knowing and promoting the strength development of concrete at an earlier age is essential for accelerating formwork circulation of the on-site construction and precast product manufacture. The strength development rate at earlier ages of less than the initial 24 h was investigated. The effect of measures of adding silica fume, calcium sulfoaluminate cement, and early strength agent on the strength development of earlier concrete at ambient temperatures of 10, 15, 20, 25, and 30 °C was studied. The microstructure and long-term properties were further tested. It is shown that the strength increases exponentially first and then logarithmically, different from what is commonly recognized. Increasing cement content exhibited a certain effect only above 25 °C. When the cement content increased from 420 to 460 kg/m3, the strength only increased from 6.2 to 6.7 MPa after 12 h at 25 °C. The early strength agent could increase the strength significantly, the strength could be increased from 6.4 to 10.8 MPa after 20 h at 10 °C and from 7.2 to 20.6 MPa after 14 h at 20 °C. All measures for promoting earlier strength did not have an evident negative effect. The results could be potentially referred for the formwork removal at a suitable moment.

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A novel early strength agent prepared by wet-grinding concrete waste slurry and its effect on early hydration and mechanical properties of cement based materials

Cited by 12 publications

References 61 publications

Evaluation of Early-Age Compressive Strength in Winter Prefabrication: A Comparative Study

Evaluation of Early-Age Compressive Strength in Winter Prefabrication: A Comparative Study

Effect of Wet Grinding Concrete Slurry Waste on Hydration and Hardening Properties of Cement: Micro-Nano-Scale Modification

Development and Promotion of Concrete Strength at Initial 24 Hours

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