【摘要】：研究了2種輕細(xì)骨料的微觀結(jié)構(gòu)與釋水性能及其預(yù)濕后對混凝土內(nèi)部相對濕度和自收縮的影響.提出了混凝土內(nèi)養(yǎng)護(hù)效率的概念,并研究了輕細(xì)骨料粒徑與顆粒分布對內(nèi)養(yǎng)護(hù)效率的影響.結(jié)果表明:輕細(xì)骨料孔隙體積和孔徑皆大于硬化水泥凈漿;預(yù)濕輕細(xì)骨料可以延遲混凝土由于自干燥引起的內(nèi)部相對濕度降低并減小其降低幅度;內(nèi)養(yǎng)護(hù)混凝土的自收縮和內(nèi)部相對濕度存在線性關(guān)系.當(dāng)輕細(xì)骨料用量占凈漿體積的36%~39%時(shí),混凝土在早期的28d內(nèi)不產(chǎn)生自收縮.混凝土內(nèi)養(yǎng)護(hù)效率隨輕細(xì)骨料顆粒間距和半徑比值的增大而減小,在輕細(xì)骨料顆粒間距和半徑比值為1.1時(shí),混凝土內(nèi)養(yǎng)護(hù)效率為100%.
[Abstract]:The microstructure and water release properties of two kinds of lightweight aggregate and the effect of prewetting on the internal relative humidity and autogenous shrinkage of concrete were studied. The concept of internal curing efficiency of concrete is put forward, and the effects of particle size and particle distribution of lightweight aggregate on internal curing efficiency are studied. The results show that the pore volume and pore size of lightweight aggregate are both larger than that of hardened cement paste, and the prewetting of lightweight aggregate can delay the decrease of internal relative humidity and decrease the extent of reduction of concrete due to self-drying. There is a linear relationship between autogenous shrinkage and internal relative humidity of internally cured concrete. When the amount of lightweight aggregate accounts for 36 ~ 39% of the net slurry volume, the concrete does not self-shrink in the early 28 days. The curing efficiency of concrete decreases with the increase of particle spacing and radius ratio of lightweight aggregate. When the ratio of particle spacing and radius of lightweight aggregate is 1.1, the curing efficiency of concrete is 100.
【作者單位】： 清華大學(xué)土木工程系;清華大學(xué)土木工程安全與耐久教育部重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家自然科學(xué)基金資助項(xiàng)目(51108246) 交通運(yùn)輸部西部交通科技項(xiàng)目(201131823710)
【分類號】：TU528.2

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本文編號：2306539