[雙語翻譯]--混凝土外文翻譯--溫度和齡期對混凝土力學(xué)性能的影響（原文）

1、Effect of temperature and aging on the mechanical properties of concrete Part I. Experimental resultsJin-Keun Kima, Sang Hun Hanb,*, Young Chul SongcaDepartment of Civil Engineering, Korea Advanced Institute of Science a

2、nd Technology, 373-1 Kusong, Yusong, Taejon 305-701, Republic of Korea bCoastal and Harbour Engineering Laboratory, Korea Ocean Research and Development Institute, 1270 Sadong, Ansan, Kyunggido 425-744, Republic of Korea

3、 cCivil and Architectural Engineering Group, Korea Electric Research Institute, 103-16 Munji, Yusong, Taejon 305-380, Republic of KoreaReceived 12 March 2001; accepted 17 January 2002AbstractThis paper reports the result

4、s of curing temperature and aging on the strength and elastic modulus and the Part II paper suggests a prediction model based on these experimental results. Tests of 480 cylinders made of Types I, V, and V cement + fly a

5、sh concretes, cured in isothermal conditions of 10, 23, 35, and 50 ?C and tested at the ages of 1, 3, 7, and 28 days are reported. According to the experimental results, concretes subjected to high temperatures at early

6、ages attain higher early-age compressive and splitting tensile strengths but lower later-age compressive and splitting tensile strengths than concretes subjected to normal temperature. Even though the elastic modulus has

7、 the same tendency, the variation of elastic modulus with curing temperature is not so obvious as compressive strength. Based on the experimental result, the relationships among compressive strength, elastic modulus, and

8、 splitting tensile strength are analyzed, considering the effects of curing temperature, aging, and cement type. D 2002 Elsevier Science Ltd. All rights reserved.Keywords: Temperature; Aging; Compressive strength; Elasti

9、c moduli; Splitting tensile strength1. IntroductionTemperature variation caused by the heat of hydration in mass concrete or the change of external environment has a large influence on the mechanical properties of early-

10、age concrete. Mechanical properties such as compressive strength, elastic modulus, and splitting tensile strength are factors to be considered in the design and construction of concrete structures. Specifically, evaluati

11、on of the thermal cracking of mass concrete structure requires estimation of the elastic modulus and tensile strength of early-age con- crete with temperature. Therefore, effects of temperature and aging on the mechanica

12、l properties must be studied and quantified [1–6]. Most of the code relationships between compressive strength and elastic modulus or splitting tensile strengthwere developed based on experimental data on concrete cured

13、at normal temperature and tested at 28 days. To apply the relationship to concretes cured at other curing temper- atures or tested at different ages, it is necessary to examine the validity of the relationships at differ

14、ent temperatures and ages [7–11]. The objectives of this study are to produce a data inventory of the early-age mechanical properties of concrete with temperature and to investigate the validity of the relationships betw

15、een compressive strength and elastic modulus or split- ting tensile strength according to temperature and aging.2. Experimental program2.1. Experimental variablesExperimental variables consisted of cement type, water– bi

16、nder ratio, and curing temperature. Details are provided in Table 1.0008-8846/02/$ – see front matter D 2002 Elsevier Science Ltd. All rights reserved. PII: S0008-8846(02)00744-5* Corresponding author. Tel.: +82-31-400-6

17、345; fax: +82-31-408-5823. E-mail address: shhan@kordi.re.kr (S.H. Han).Cement and Concrete Research 32 (2002) 1087–1094of Type V cement concretes is not so obvious, due to the difference in the hydration rate with cemen

18、t type. Because the hydration rate of Type V cement concrete is slower than that of Type I cement concrete, the crossover effect of Type Vcement concrete is delayed. Therefore, the crossover effect of Type V cement concr

19、ete at testing ages is not so obvious as Type I cement concrete. Tables 6 and 7 give the experimental results for Type V cement and Type V cement + fly ashTable 4 Basic mixture proportionsUnit weight (kg/m3)Binder (b) Ad

20、mixtureCement typeWater– binder ratio (w/b)Sand– aggregate ratio (s/a) Water (w) Cement (c) Fly ash (f ) Sand (s) Gravel (g) AE agent (b ? %) Superplasticizer (b ? %)Types I and V 0.40 0.39 181 452 – 630 989 0.005 0.5 Ty

21、pes I and V 0.50 0.42 181 362 – 707 989 0.005 0.5 Type V + fly ash 0.40 0.38 181 385 68 608 989 0.005 0.5Fig. 1. Experimental compressive strength and elastic modulus.J.-K. Kim et al. / Cement and Concrete Research 32 (2