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对低水胶比(m_W/m_B=0.3)复掺外加剂体系(膨胀剂、减水剂、引气剂)拌制的混凝土进行强度及耐久性正交试验,分析了不同掺量对新拌混凝土工作性、混凝土强度及耐久性的影响规律,基于电通量法和快速氯离子迁移系数法(RCM法)评定混凝土的耐久性,给出各外加剂的最优掺量。结果表明:外加剂复掺体系所引起的电通量及氯离子迁移系数变化趋势相近,耐久性变化均随着外加剂掺量的增加先变好后变差,在此配合比下,JS=1.5%,YQ=0.4%,PZ=8%时混凝土耐久性最好;3种外加剂对混凝土的强度增长均有促进的作用,其中减水剂对混凝土早期强度和后期强度影响最明显;随着引气剂掺量的增加,强度先降低后增加;膨胀剂掺量对混凝土强度影响无固定规律。鉴于试验选用地材及配合比等的局限性,本研究仅为后续类似研究提供参考。
The strength and durability of the concrete mixed with low water cement ratio (m_W / m_B = 0.3) complex admixture system (expander, water reducer, air entraining agent) were tested by orthogonal test. Concrete workability, strength and durability of concrete, the durability of concrete was evaluated based on the flux method and the rapid chloride ion mobility coefficient method (RCM method), and the optimum dosage of each admixture was given. The results show that the electrical flux and chloride migration coefficient induced by the admixture system are similar, and the change of durability is better with the increase of admixture, 1.5%, YQ = 0.4%, PZ = 8%, the durability of concrete is the best. The three kinds of admixtures can promote the strength of concrete. The water-reducer has the most obvious influence on the early strength and later strength of concrete. With the increase of air-entraining agent content, the strength first decreases and then increases; the influence of the content of expander agent on the concrete strength has no fixed rule. In view of the limitations of the test materials and mix selection, this study only provide reference for subsequent similar research.