sap和聚丙烯纤维对低碳碾压混凝土路面抗冻融性能的影响

MATEC Web of Conferences Pub Date : 2023-01-01 DOI:10.1051/matecconf/202337808006

Vahid Afroughsabet, A. Al-Tabbaa

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引用次数: 0

摘要

目前用于路面的大多数混凝土都是基于波特兰水泥(PC)，占二氧化碳总排放量的8-10%。此外，外部路面受到与腐蚀和冻融有关的XF4和XD3暴露等级。抗冻融性能是混凝土的一项重要耐久性性能，特别是对于使用除冰盐的混凝土路面。本研究旨在探讨低碳碾压混凝土(RCC)在水和除冰盐存在下的冻融性和质量抗结垢性。采用四种不同的碾压混凝土混合料，水胶比为0.45。在所有混合料中，80%的颗粒状高炉矿渣(GGBS)取代了PC，以开发低碳混凝土，并向更可持续的胶凝复合材料迈进。为了评估智能工程添加剂的有效性，高吸水性聚合物(sap)在总黏合剂重量的0.3%中使用，12mm长度的聚丙烯(PP)纤维在纤维体积分数的0.3%中使用，以减轻冻融损伤。对混凝土试件的抗压强度、抗冻融性能和抗体积结垢性能进行了评价。结果表明，添加和不添加除冰盐均能提高混凝土的抗压强度和抗冻融性能。与参考混凝土相比，在56次冻融循环后，PP纤维的掺入比sap的添加更有效地减轻了内部结构损伤的程度和自愈混凝土混合物的质量结垢。

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Effect of SAPs and polypropylene fibres on the freeze-thaw resistance of low carbon roller compacted concrete pavement

Most concrete currently used in pavement is based on Portland cement (PC), being responsible for 8-10% of total CO2 emission. Moreover, external pavements are subjected to exposure classes XF4 and XD3 which are related to corrosion and freeze-thaw. Freeze-thaw resistance is an important durability property of concrete, especially for concrete pavements that are subjected to the de-icing salts. This study was designed to explore the freeze-thaw resistance and mass scaling resistance of low carbon Roller Compacted Concrete (RCC) in the presence of water and de-icing salts. Four different RCC mixes were used with a water/binder ratio of 0.45. PC was replaced with 80% ground granulated blast-furnace slag (GGBS) in all mixes to develop low carbon concrete and move towards a more sustainable cementitious composite. To assess the effectiveness of smart engineered additives, superabsorbent polymers (SAPs) were used at 0.3% by weight of total binder, and Polypropylene (PP) fibre with 12-mm length at fibre volume fractions of 0.3% for the mitigation of freeze-thaw damage. The compressive strength, freeze-thaw resistance, and mass scaling resistance of concrete specimens were evaluated. The results indicate that both additives improved the compressive strength and freeze-thaw resistance of concrete with and without de-icing salts. The inclusion of PP fibre was more effective compared to the addition of SAPs to mitigate the extent of internal structural damage and mass scaling of self-healing concrete mixes with respect to the reference concrete after 56 freeze-thaw cycles.

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来源期刊

MATEC Web of Conferences

自引率

0.00%

发文量

342

审稿时长

6 weeks

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