求一篇土木工程工民建有关的英文文章，完整的，不要太多字，有没有中文翻译无所谓

The damage processes of ordinary concrete and high strength concrete,attacked by solutions of 2.5%,5.0% and 10%Na2SO4(mass fraction)are studied.And the effects of flexural loads with stress ratios of 25% and 50% of the initial flexural strength on the damage process of concrete are also investigated.The results show that the damage process of concrete attacked by sulfate salt exhibits an initial damaged stage,a performance improving stage and a performance worsening stage.When the concentration of Na2SO4 in a solution increases from 2.5% to 5.0%,the service time of the concrete decreases approximately 25%.Furthermore,it decreases to even 40% with an increase in a Na2SO4 concentration up to 10%.And the flexural load accelerates the deterioration rate of the concrete in the latter period.The stress ratio increases from 0 to 25%,the failure time of the concrete decreases 15%and the failure time decreases between 25% and 35% when the stress ratio increases from 25% to 50%.In addition,sulfate corrosion products of concrete are studied by SEM (scanning electron microscopy),EDS (energy disperse spectroscopy) and XRD(X-ray diffraction).

美元CM_FORMAT JEOL /光电

CM_VERSION 1.0美元

美元CM_COMMENT淮北

CM_DATE 2011-03-06美元

美元CM_TIME 16:36:34

美元CM_OPERATOR一般

美元CM_INSTRUMENT地产- 6610

CM_ACCEL_VOLT 30美元

CM_MAG 2000美元

美元CM_SIGNAL SEI

CM_STAGE_POS -8.600 15.877 - 10.001 15.877 - 10.001美元

CM_STAGE_X -8.600美元

CM_STAGE_Y 15.877美元

CM_STAGE_T 0.000美元

CM_STAGE_Z 10.001美元

CM_STAGE_R 0.010美元

SM_MICRON_MARKER 10兪美元美元

SM_FILM_NUMBER美元0000美元

$ $ SM_TITLE PC-SEM M600

$ $ SM_WD 12

$ $ SM_SPOT_SIZE 40

$ $ SM_VACUUM

SM_PHOTO美元美元

SM_MERGE美元美元

$ $ SM_SIGNAL1

$ $ SM_SIGNAL2

$ $ SM_MULTI

如果使用Stage2634进行取代Stage2624，因为Stage2634和Stage2624的单元结构都是采用石英晶体技术，所以在时钟精度和稳定性方面可以达到良好的效果，而且具有更小的容差和更强的抗干扰能力，所以可以完全取代Stage2624。

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