【摘要】：采用東非地區(qū)大吸水率骨料和國內(nèi)普通吸水率骨料,對比研究了大吸水率骨料對混凝土性能的影響,結(jié)果表明:大吸水率骨料配制混凝土的初始工作性狀態(tài)較普通骨料混凝土差,且1 h后坍落度損失大;大吸水率骨料配制混凝土28 d齡期之前的抗壓強(qiáng)度與普通骨料混凝土相當(dāng),28 d以后強(qiáng)度增長率下降,90 d時抗壓強(qiáng)度較普通吸水率骨料混凝土降低5.2 MPa;大吸水率骨料混凝土的抗氯離子滲透性能、密實(shí)性、抗凍性能和長期收縮性能均較普通骨料混凝土差,為了保證工程服役的100年設(shè)計(jì)壽命,解決好大吸水率骨料混凝土的耐久性問題至關(guān)重要。
[Abstract]:In this paper, the effect of large water absorption aggregate on concrete performance is compared with that of common water absorption aggregate in East Africa. The results show that the initial workability of concrete prepared with high water absorption rate is worse than that of ordinary aggregate concrete, and the slump loss is larger after 1 hour. The compressive strength of concrete prepared with high water absorption rate before 28 d age is equivalent to that of ordinary aggregate concrete after 28 days. The compressive strength of concrete with high water absorption ratio is reduced by 5.2 MPa; and large water absorption ratio bone after 90 days compared with that of ordinary aggregate concrete. Chloride ion penetration resistance of concrete, The compactness, frost resistance and long-term shrinkage of aggregate concrete are all worse than that of ordinary aggregate concrete. In order to ensure the design life of engineering service for 100 years, it is very important to solve the durability problem of aggregate concrete with large water absorption rate.
【作者單位】： 中國路橋工程有限責(zé)任公司;中國建筑科學(xué)研究院;北京科技大學(xué);
【分類號】：TU528

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