透水水泥混凝土的力學性能畢業(yè)設計外文資料翻譯

1、中文 中文 4457 4457 字外文參考資料 外文參考資料Mechanical properties of pervious cement concreteCHEN Yu1, WANG Ke-Jin2, LIANG Di11. School of Traffic and Transportation Engineering,Changsha University of Science and Technology, Changsha

2、410004, China;2.Department of Civil, Construction and Environmental Engineering, Iowa State University, Ames, IA50010, USA © Central South University Press and Springer-Verlag Berlin Heidelberg 2012 Abstract: Compre

3、ssive and flexural strength, fracture energy, as well as fatigue property of pervious cement concrete with either supplementary cementitious materials (SCMs) or polymer intensified, were analyzed. Test results show that

4、the strength development of SCM-modified pervious concrete (SPC) differs from that of polymer-intensified pervious concrete (PPC), and porosity has little effect on their strength growth. PPC has higher flexural strength

5、 and remarkably higher flexural-to-compressive strength ratio than SPC at the same porosity level. Results from fracture test of pervious concrete mixes with porosity around 19.5% show that the fracture energy increases

6、with increasing the dosage of polymer, reflecting the ductile damage features rather than brittleness. PPC displays far longer fatigue life than SPC for any given failure probability and at any stress level. It is proved

7、 that two-parameter Weibull probability function describes the flexural fatigue of pervious concrete.Key words: pervious concrete; strength; fracture; fatigue life1 IntroductionPervious cement concrete was a concrete wit

8、h continuous voids that were intentionally incorporated into concrete by blending with no or very little amount of fine aggregates. Cementitious materials were not enough to fill the voids among coarse aggregates with sp

9、ecial particle-size distribution to make interconnected macro pores [1?2]. The range of porosity that was commonly reported for pervious concrete utilized in pavement, was about 15%?25% [3?4]. The significantly reduced s

10、trength of conventional pervious concrete due to high porosity, not only limited its application in heavy traffic roads but also influenced the stability and durability of the structures, because of,for example, suscepti

11、bility to frost damage and low resistance to chemicals. However, by using appropriatelyselected aggregates, silica fume (SF) or organic intensifiers, and by adjusting concrete mixing proportion, the mechanical properties

12、 of pervious concrete could be improved greatly [5?6]. YANG and JIANG [7] showed that the use of SF and superplasticizer (SP) in pervious concrete could obviously enhance its strength. The results also indicated that SF

13、had a better effect for improving the properties of pervious concrete than polymer when using with SP; and it could obtain compressive strength of 50 MPa and flexural strength of 6 MPa. KEVERN [8] presented that the addi

14、tion of polymer (styrene butadiene rubber) in pervious 550 mm), which sustained two-thirds symmetrical loading F. The corresponding strain ξ was measured by X?Y digital recorder. ξ was then translated into , which meant

15、the mid-span deflection of beam specimen in accordance with Eq. (1). So, the enveloped area by F?▽ curve and X-axis was defined as W, fracture energy of concrete, which could be calculated by Eq. (2) [15?16]:(1) Ha L12)

16、4 3 ( 2 2 ? ? ? ? ?(2) ? ? ? Fd WWhere▽is the dynamic deflection of the mid-span beam; L and H are the span and height of beam specimen, respectively. ξ is the strain value measured at the midpoint of beam bottom, while

17、 a refers to the horizontal distance from the loading point to the support abutments.MTS-810 TEST STAR, an electro-hydraulic servo-type material testing machine, was served to measure the flexural fatigue life of perviou

18、s concrete. Three stress levels of sine wave loading (0.90, 0.80 and 0.70) with 0.1 of cycling eigenvalue, 10 Hz of frequency and zero time gap, were adopted. The number of the cyclic load that the tested specimens were

19、subjected until failure was recorded.Table 1 Properties of OPCChemical compositions /% Strength at 3 d/MPa Strength at 28 d/MPaSiO2 Al2O3 CaO MgO Fe2O3 SO3 K2OCompressive FlexuralCo

20、mpressive Flexural22.1 5.1 62.5 1.5 4.2 2.9 0.427.7 5.453.7 8.1Table 2 Properties of SJ-601Solid content/ Viscosity/

21、 pH Density/ Ratio of strength with to without SJ-601% （Pa·s） （g·mL-1） Compression Bending Tension C

22、ohesion47±3 0.03﹣0.04 5 1.08±0.03＞0.9 1.2 1.2 1.5Table 3 Mixing proportions of pervious concreteΨ

23、 Porosity/ SPC PPC% Water-to-binder ratio FA/% SF/% SP/% Water-to-cement ratio SJ-601/%0.90﹣0.98 15﹣250.28﹣0.34 12﹣18 6﹣10 0.3﹣0.80.30﹣0.34

24、 8﹣123 Results and discussion3.1 StrengthThe compressive strengths of all mixes are expressed as a percentage of their 28 d strength and shown in Fig. 1. No evident effect of porosity on the strength development for

25、both SPC and PPC is observed, that is, pervious concretes at different porosities follow the same strength growth process. The strength development of SPC is obviously rapid at early ages with more than 50% at 3 d and 80

26、% at 7 d; while the further increments are only 5.6% at 56 d and 8.9% at 90 d on average, respectively (Fig. 1(a)). Immediately after cement paste is hardened, which is accelerated by SF and SP, aggregates are wrapped an

27、d cemented together to form the skeleton- pore structure, obtaining quite strong ability to resist destructive load. However, due to much larger quantity of aggregates in pervious concrete compared to that in conventiona