本文選題：內(nèi)養(yǎng)護(hù)混凝土 + 預(yù)濕輕細(xì)骨料　； 參考：《建筑材料學(xué)報(bào)》2016年05期

【摘要】：研究了摻入預(yù)濕輕細(xì)骨料(粉煤灰陶砂)的內(nèi)養(yǎng)護(hù)混凝土與普通混凝土在不同干燥環(huán)境下的收縮和相對(duì)濕度發(fā)展、質(zhì)量損失、強(qiáng)度發(fā)展及開裂風(fēng)險(xiǎn).結(jié)果表明:當(dāng)暴露在干燥環(huán)境時(shí),內(nèi)養(yǎng)護(hù)混凝土的相對(duì)濕度下降速率和總體收縮速率均大于普通混凝土,延長密閉養(yǎng)生時(shí)間至28d不能顯著降低內(nèi)養(yǎng)護(hù)混凝土的總體收縮;干燥環(huán)境下內(nèi)養(yǎng)護(hù)混凝土更易失水,從而降低內(nèi)養(yǎng)護(hù)效率;早齡期暴露于干燥環(huán)境下的普通混凝土和內(nèi)養(yǎng)護(hù)混凝土的抗壓強(qiáng)度和彎拉強(qiáng)度均顯著降低;干燥環(huán)境下,內(nèi)養(yǎng)護(hù)技術(shù)不能顯著提高混凝土的抗開裂性能,但在不與外界發(fā)生水分交換的條件下,內(nèi)養(yǎng)護(hù)混凝土未出現(xiàn)開裂.因此,內(nèi)養(yǎng)護(hù)混凝土宜用于大體積混凝土或非表層的結(jié)構(gòu)物混凝土中.
[Abstract]:The shrinkage and relative humidity development, mass loss, strength development and cracking risk of inner curing concrete and ordinary concrete mixed with pre-wet light fine aggregate (fly ash ceramic sand) under different dry conditions were studied. The results show that the decrease rate of relative humidity and the total shrinkage rate of internal curing concrete are higher than that of ordinary concrete when exposed to dry environment, and the total shrinkage of inner cured concrete can not be significantly reduced by prolonging the closed health time to 28 days. Curing concrete in dry environment is more likely to lose water, thus reducing internal curing efficiency; compressive strength and flexural strength of common concrete and internal cured concrete exposed to dry environment at early age are significantly reduced; under dry environment, Internal curing technology can not significantly improve the cracking resistance of concrete, but without water exchange with the outside world, there is no cracking in the internal curing concrete. Therefore, internal curing concrete should be used in mass concrete or non-surface structure concrete.
【作者單位】： 清華大學(xué)土木工程系;
【基金】：國家自然科學(xué)基金資助項(xiàng)目(51578316)
【分類號(hào)】：TU755.7

【相似文獻(xiàn)】

相關(guān)期刊論文 前3條

1 李密芳;;西歐磚坯干燥研究的新發(fā)展[J];磚瓦;2006年06期

2 宋振軍;;樓內(nèi)干燥對(duì)居住有什么影響?[J];建筑工人;1983年12期

3 ;[J];;年期

，

本文編號(hào)：1908836