The test results show that low grade cement, replacement of cement by fly ash, and adding some carbon fibers are all helpful in improving the self-healing performance of concrete.

结果表明：选用低强度等级水泥、用粉煤灰部分取代水泥以及加入纤维都可以在一定程度上提高混凝土的自愈合效果。

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Through proper designed plan, high quality cement clinker was obtained by using low grade limestone as raw material. Samples were investigated by petrography analysis (PA) and X-ray diffraction (XRD).

以低品位的石灰石为原料，通过合理的配料方案，成功制备了性能优异的水泥熟料。

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This article discussed from three-axis concrete pavement construction point of view briefly in the low-grade cement concrete pavement construction, how to control good road surface roughness.

本文从三轴式水泥混凝土摊铺机施工的角度出发，简要阐述了在低等级水泥混凝土路面施工中，如何控制好路面平整度。

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Both are known to be done poorly and with low grade cement.

FORBES: The Fracking Solution Is A Good Cement Job