The single factor experience of Fiber Reinforced Ceramic Matrix Composites (briefly named FCC) grinding was done on a NC optical curve grinding machine, and then the morphologie of the grinding surface was observed with an optical microscope. The effect of the grinding parameters, which include mainly grinding depth, abrasive grain size of diamond grinding wheel and grinding direction, on the grinding-induced surface damage of FCC was discussed, finally, the paper drew the conclusions that both increasing of grinding depth and increasing of abrasive grain sizes of diamond wheel can make the grinding-induced surface damage worse, and that different grinding directions also produce different effects on the grinding-induced surface damage.
Comparison of the influence of amino trimethylene phosphonic acid (ATMP) and sodium gluconate (SG) on the performance of concrete are investigated in this paper. The comparison of the effects of ATMP and SG on concrete setting time at 20°C or 35°C, concrete slump loss, concrete compressive strength and cement pastes dry shrinkage are investigated. The results show that the retard effect of ATMP is much stronger than SG at 20°C and the dosage is higher the retard effect is obvious, the "temperature adaptability" of SG is much worse than ATMP; SG and ATMP both have the "auxiliary water reducing effect" and "slump loss resistant effect", nevertheless the "slump loss resistant effect" of ATMP is better than SG; the development rate of concrete early age compressive strength within ATMP is slow than the concrete within SG, but the concrete later strength within ATMP will exceed the blank concrete and the concrete within SG at the dosage range from 0.06% to 0.15%; the relationship of cement paste dry shrinkage is ATMP>SG.
The grinding experiments of Quartz Fiber-Reinforced Quartz Composites(QFRQC) were conducted on MK9025 NC optical curve grinding machine. Grinding forces were measured by KISTLER dynamometer and the morphologies of the grinding surface were observed with Hatchi S-4800 SEM. In this paper, the effect of grinding orientation on the ground surface damage of QFRQC was discussed. Grinding orientation has a big influence on the ground surface damage. When grinding orientation is perpendicular to fiber orientation, the surface of the workpiece is poor; By contrast, when grinding orientation is parallel to fiber orientation, the surface of the workpiece is good; when grinding is on the fiber end-faces, the surface of the workpiece is best.
Using self-designed indoor detecting methods, the performance test of shotcrete doped compound admixture and crude fiber were carried out. The results showed that compound admixture and crude fiber can improve the compressive strength, flexural toughness and crack resistance of shotcrete. Axial bond strengths of shotcrete with rock were more than 1.0MPa, and that can be increased by combined-doped compound admixture and crude fiber. Rebound rates of shotcrete were 23% and 20%, layer thickness in one shot cycle were 22cm and 25cm, and combined-doped compound admixture and fiber can increase the cohesiveness and reduce rebound rate. Self-designed methods can be used to compare construction performance of different shotcretes.
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