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首页> 外文会议>Fifth ACI International Conference on Innovations in Design with Emphasis on Seismic, Wind, and Environmental Loading; Quality Control and Innovations in Materials/Hot-Weather Concreting Dec, 2002 Cancun, Mexico >Effect of Curing in a High Temperature Environment on Compressive Strength of Concrete Incorporating Different Complementary Cementitious Materials
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Effect of Curing in a High Temperature Environment on Compressive Strength of Concrete Incorporating Different Complementary Cementitious Materials

机译：高温环境下养护对掺入不同互补胶凝材料的混凝土抗压强度的影响

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This paper provides results of different types of curing in hot weather environment on the compressive strength of concrete made with portland cement and complementary cementitious materials (CCM) such as natural pozzolans, fly ash (FA), granulated blast furnace slag (GBFS), and silica fume (SF). In all concrete mixtures, a superplasticizing admixture (SPA) was used. Nine series of concrete mixture were made. In seven of them (1, 2, 3, 4, 5, 6 and 9) the normal portland cement (NPC) content was 200 kg/m3 and in two of them (7 and 8) the same amount of cement was used but it was a portland-natural pozzolan cement (PNPC). The CCM varies from 9.9 to 60.6% of the total cementitious material. The W/C in all series was 0.70 when using NPC or PNPC. The W/C+CM varied from 0.28 to 0.63. In all series the same amount of 1260 kg/m~3 of coarse aggregate was used. Five different ways of curing were used. One was the initial and final ASTM curing at 23℃ up till the age of testing as reference, and four different ways of curing in hot weather environment at 37℃ for the first 24h were used. These final curings were: A) ASTM; F) three day and G) seven-day water spray for 15 minutes every 2h; and (E) covered by two layers of membrane. Adequate compressive strength development (CSD) can be obtained using CCM but very good curing is necessary. Generally, by casting specimens at 37℃ and put them under ASTM curing next day at 23+-2℃(A), the strength at 28 days was lowered by about 8% and at six months by about 8% lower than these casting at 23℃. Membrane curing was less effective at later ages mainly when fly ash was used. There exist an optimum amount of fly ash to obtain maximum compressive strength at later ages.
机译：本文提供了在高温天气条件下不同固化类型的结果，这些固化方法是对由硅酸盐水泥和天然水凝火山灰，粉煤灰（FA），粒状高炉矿渣（GBFS）等补充胶凝材料（CCM）制成的混凝土的抗压强度的结果硅粉（SF）。在所有混凝土混合物中，都使用了超塑化外加剂（SPA）。制成了九个系列的混凝土混合物。在其中的七个（1、2、3、4、5、6和9）中，普通硅酸盐水泥（NPC）含量为200 kg / m3，而在其中的两个（7和8）中，水泥用量相同，但它是波特兰天然火山灰水泥（PNPC）。 CCM占全部水泥材料的9.9％至60.6％。使用NPC或PNPC时，所有系列的W / C为0.70。 W / C + CM从0.28到0.63。在所有系列中，均使用相同量的1260 kg / m〜3的粗骨料。使用了五种不同的固化方式。一种方法是在23℃下进行初始和最终ASTM固化直至测试年龄作为参考，并在37℃的炎热气候下最初的24小时内使用四种不同的固化方法。这些最终固化是：A）ASTM； F）三天，G）七天喷水，每2小时15分钟； （E）被两层膜覆盖。使用CCM可以获得足够的抗压强度发展（CSD），但是非常好的固化是必要的。通常，通过在37℃下浇铸试样，然后在第二天在23 + -2℃（A）下使其经受ASTM固化，与浇铸时相比，28天的强度降低了约8％，六个月时的强度降低了约8％。 23℃。膜固化在后期使用时效果较差，主要是使用粉煤灰。存在最佳量的粉煤灰，以便在以后的年龄中获得最大的抗压强度。

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