High Pressure Steam Curing of Reactive-Powder Mortars

L. Massidda, U. Sanna, E. Cocco, P. Meloni
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引用次数: 29

Abstract

The authors have studied the effects of autoclaving under saturated vapor at 180 degrees C on the physical and mechanical properties of reactive-powder mortars reinforced with brass coated steel fibers. The system consisted of portland cement (ASTM Type V), silica fume, natural silica sand (maximum grain size<1mm), an acrylic super-plasticizer, and brass coated steel fibers (L=13mm, theta=0.18mm); a water-to-cement of 0.255 was used to obtain a flowable system. Specimens were subjected to high pressure steam curing for 3 hours after preliminary curing at normal temperatures and for different times. Samples pre-cured at normal temperature for 24 hours and 3 days were autoclaved for up to 12 hours. Autoclaving generally produced beneficial effects on the mechanical properties, both in terms of flexural and compressive strength. High pressure steam curing for 3 hours of specimens pre-cured at ambient temperature for 3 days yielded flexural strength of 30 MPa and compressive strength of 200 MPa. The strengthening mechanisms depend only in part on the greater degree of hydration as the hydrated phases that form in the systems prepared with low water/cement are highly impermeable. The main effect appears to be the result of modifications to the microstructure that manifests itself as a reduction in porosity and hence in better mechanical properties.
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反应性粉末砂浆的高压蒸汽养护
研究了180℃饱和蒸汽高压灭菌对铜包钢纤维增强反应性粉末砂浆物理力学性能的影响。该体系由波特兰水泥(ASTM V型)、硅灰、天然硅砂(最大粒径<1mm)、丙烯酸超强增塑剂和黄铜涂层钢纤维(L=13mm, θ =0.18mm)组成;采用0.255的水灰比获得可流动体系。试件在常温和不同时间预养护后进行高压蒸汽养护3h。在常温下预固化24小时和3天的样品被高压灭菌至12小时。高压灭菌通常对机械性能产生有益的影响,无论是在弯曲和抗压强度方面。常温预固化3天试件高压蒸汽固化3小时,抗折强度为30 MPa,抗压强度为200 MPa。强化机制仅部分取决于更大程度的水化,因为在低水/水泥制备的体系中形成的水化相具有高度的不渗透性。主要效果似乎是微观结构改变的结果,其表现为孔隙率的降低,从而获得更好的机械性能。
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