高吸水性树脂对自密实混凝土性能的影响

发布时间：2018-01-22 04:15

本文关键词： 自密实混凝土高吸水性树脂自收缩碳化氯离子渗透性　出处：《材料导报》2015年20期 　论文类型：期刊论文

【摘要】：高吸水性树脂(SAP)具有很强的吸水性能,但是失水后形成SAP孔,使其在混凝土中呈现出与其它外加剂不同的特性。系统研究了SAP内养护水胶比及粒径对自密实混凝土(SCC)抗压强度、早期自收缩、干缩、吸水性、抗碳化能力、抗氯离子渗透性的影响。结果表明:当内养护水胶比增加时,SCC早期自收缩明显降低,且抗压强度未出现明显变化;虽然混凝土吸水性增加,但抗碳化性能和抗氯离子渗透性提高,而干缩与内养护水胶比有关。粒径为75~125μm的SAP改善自收缩、干缩效果较好,而粒径为30~75μm时SAP的抗碳化性能和抗氯离子渗透性提高较好。
[Abstract]:The superabsorbent resin (SAP) has strong absorbency, but the SAP pore is formed after losing water. The curing water / binder ratio and particle size in SAP are studied systematically for the compressive strength, early autogenous shrinkage, dry shrinkage and water absorption of self-compacting concrete. The results show that the early autogenous shrinkage of SCC decreases obviously and the compressive strength does not change obviously when the ratio of curing water to binder increases. Although the water absorption of concrete is increased, the carbonation resistance and chloride ion permeability are improved, and the dry shrinkage is related to the water binder ratio of internal curing. The self-shrinkage is improved by SAP with the diameter of 75 ~ 125 渭 m, and the effect of dry shrinkage is better. However, the carbonation resistance and chloride penetration resistance of SAP were improved when the particle size was 30 ~ 75 渭 m.
【作者单位】：湖南大学土木工程学院;河南城建学院;
【基金】：国家自然科学基金(51378196;51461135001;U1305243)
【分类号】：TU528
【正文快照】： 0引言自密实混凝土因无需振捣而达到较高的密实性和稳定性,正日益显现出其环境友好性、技术性及经济性等方面的优势[1]。由于其特殊的组成,自密实混凝土常有较高的细骨料含量和较高的浆体体积,具有比普通混凝土更高的抗开裂风险[2]。因此,对自密实混凝土收缩性能及改善方法等

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