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The effect of superabsorbent polymers on the mitigation of plastic shrinkage cracking of conventional concrete, results of an inter-laboratory test by RILEM TC 260-RSC

机译:超吸收性聚合物对传统混凝土塑料收缩裂纹缓解的影响,RILEM TC 260-RSC的实验室检测结果结果

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摘要

This article presents the results of an inter-laboratory study performed by six international research groups in the framework of RILEM Technical Committee 260 RSC "Recommendations for use of superabsorbent polymers in concrete construction". Two commercially available superabsorbent polymer (SAP) samples with different chemical compositions were tested in terms of their ability to mitigate plastic shrinkage cracking of concrete. The SAP mixtures showed a clear reduction of plastic shrinkage cracking in conventional concrete. On the contrary, if only additional water is added and no SAP, the area of plastic shrinkage cracks increases. This suggest the ability of SAP to mitigate plastic shrinkage cracking. Upon addition of the predetermined amount of SAP and additional water, the compressive strength decreased on average by 3% for the mixtures with 0.15% SAP (by mass of cement) and by 10% for the mixtures with 0.30% SAP.
机译:本文介绍了六个国际研究小组在Rilem技术委员会260 RSC框架中进行了实验室内研究的结果,在260 RSC的建议中使用了超吸收性聚合物在混凝土施工中的建议“。在减轻混凝土塑料收缩裂缝的能力方面测试了具有不同化学成分的两种可商购的超吸收性聚合物(SAP)样品。 SAP混合物在常规混凝土中透明地减少了塑料收缩裂缝。相反,如果只添加额外的水而没有SAP,则塑料收缩裂缝面积增加。这表明SAP减轻塑料收缩裂缝的能力。在加入预定量的SAP和额外的水中,对于0.15%SAP(水泥质量)的混合物,抗压强度平均降低3%,对于0.30%SAP的混合物,混合物的混合物降低3%。

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