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Effect of Assembly Unit of Expansive Agents on the Mechanical Performance and Durability of Cement-Based Materials

机译：膨胀剂组装装置对水泥基材料机械性能及耐久性的影响

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This paper studies the influence of assembly unit of expansive agents (CaO and calcium sulphoaluminate) on the limited and free compressive strengths, the limited expansion rate, carbonation resistance, chloride ion penetration resistance and corrosion resistance of reinforcement concrete. The dosages of expansive agent were 0%, 3%, 6%, 9%, and 12% by the total amount of cementitious materials. Two kinds of mineral admixture (blast furnace slag and fly ash) were applied in this study. Results show that suitable dosage (lower than or equal to 9%) of double expansion agent with a large amount of mineral admixtures can improve the limited and free compressive strengths. However, when the dosage of the double expansion agent is higher than 9%, the addition of the double expansion agent leads to the reduction of limited and free compressive strengths. The variation of the limit expansion rate reaches the maximum value when the curing age is 14 days. The increasing addition of expansive agents and lower water-binder ratio demonstrate positive effect on the limited expansion rate. Concrete with 60% mineral admixtures (fly ash and ground granulated blast furnace slag) shows lower limited expansion rate and higher compressive strength than the concrete with 50% mineral admixtures. Finally, the incorporation of double expansion agent can improve the resistance to carbonation, chloride ion penetration resistance, anti-corrosion of steel bars and mechanical strengths (the limited and free compressive strengths).
机译：本文研究了膨胀剂（CaO和硫代钙钙钙）组装单元对有限抗压强度，有限的膨胀率，碳化，氯离子渗透性和钢筋混凝土耐腐蚀性的影响。膨胀剂的剂量为0％，3％，6％，9％和12％通过水泥材料的总量。本研究应用了两种矿物混合物（高炉炉渣和粉煤灰）。结果表明，具有大量矿物混合物的双膨胀剂的合适用量（低于或等于9％）可以改善有限和自由抗压强度。然而，当双膨胀剂的剂量高于9％时，添加双膨胀剂导致减少有限和自由抗压强度。当固化年龄为14天时，极限膨胀率的变化达到最大值。增加膨胀剂和较低的水 - 粘合剂比例对膨胀率有限的阳性作用表现出积极影响。具有60％矿物混合物（粉煤灰和地颗粒高炉渣）的混凝土显示出较低的膨胀率和比具有50％矿物混合物的混凝土更高的抗压强度。最后，掺入双膨胀剂可以改善对碳化的耐药性，氯离子渗透性，钢筋的防腐和机械强度（限制和自由抗压强度）。

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