In order to explore the feasibility of coal gasification slags as cement admixture, the strength mechanism of cement cementitious hardening products affected by coal gasification slags was studied. The differences of the formation processes between coal gasification slags or fly were analyzed by comparison with each other. The microstructure and phase composition of coal gasification slags, fly ash and their cement cementitious products were studied by scanning electron microscope, energy dispersive spectrometer and X-ray diffraction test. Cement mortar specimens with coal gasification slags or fly under different dosages were prepared respectively, and the mechanical strength values of cement mortars at different ages were tested. The results show that the distinct formation processes of fly ash and coal gasification slags lead to their great differences in micro-morphology and material compositions. Their ignition loss can be sorted from large to small as fine coal gasification slag, coarse coal gasification slag, fly ash, and the residual carbon content of fine slag is much higher than that of coarse slag and fly ash. Coal gasification coarse slag appears mainly in lamellar and massive structure. The fine slag possesses mostly honeycomb flocs with a small number of spherical particles. Fly ash presents mostly in spherical structures. There are similar in their elemental compositions, including aluminosilicate minerals with pozzolanic activity. The ettringite formed in the coarse slag slurry is thick needle-like and interwoven into reticular structure, while it is fine needle-like and well distributed around the C-S-H gel in fly ash slurry. No obvious ettringite phase is found in fine slag slurry. The amount of the Ca（OH） 2 from cement hydration, consumed by the coarse slag is greater than that by fly ash. The active mineral phase in the fine slag is surrounded by residual carbon, so the pozzolanic activity cannot be released, and the residual carbon also affects the hydration process of cement. The 7 d strength of cement mortar mixed with fly ash or coal gasification slags is lower than that of reference cement mortar. The compressive strength of cement mortar mixed with fly ash is higher than that of reference mortar at 28 d. The compressive strength of cement mortar mixed with coarse slag is equal to that of reference mortar, while the strength of cement mortar mixed with fine slag is much lower than that of reference mortar. Coarse slag can be used as cement admixture in place of 5%（mass fraction, the same below） cement, but fine slag is inappropriate used as cement admixture directly. The research results can provide an important reference for comprehensive development and utilization of coal gasification slags. 5 tabs, 7 figs, 29 refs.

为缓解半刚性基层沥青路面裂缝病害,选取新型防裂基布和聚酯玻璃纤维布2种不同材料土工布进行防治反射裂缝试验效果研究.通过室内试验,对2种土工布的厚度、质量、拉伸强度、撕裂强度、CBR顶破强力等关键指标进行检测,对比分析其物理性质和受力性能.结果表明,聚丙烯材质的新型防裂基布具有良好的抗撕裂性,其能承受的顶破强力约为聚酯玻璃纤维布的4倍,抗拉强度保持率和强力保持率高于聚酯玻璃纤维布,其防反射裂缝效果优于聚酯玻璃纤维布.