An investigation on the anti-water properties of phosphorus building gypsum (PBG)-based mortar
An investigation on the anti-water properties of phosphorus building gypsum (PBG)-based mortar
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磷建筑石膏（PBG）基砂浆的抗水性能研究
DOI：
10.1007/s10973-018-7825-3
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发表时间：
2019-05-01
影响因子：
4.4
通讯作者：
Jia, Ruiquan
中科院分区：
文献类型：
--
作者：
Wang, Qiang;Zhuang, Shiyu;Jia, Ruiquan
为制备高阻水系数磷建筑石膏（PBG）基砂浆，探讨含磨细矿渣（GGBS）和氢氧化钙（CH）的PBG基砂浆的抗水机理。PBG基砂浆的主要水化产物为CS（A）H和钙矾石（AFt），其中沿着有CsH 2; PBG基砂浆中发生了2A + 6CH +6CsH 0. 5 + 55 H → 2（C3 A·3Cs·32 H）的化学反应;当大部分CsH 0. 5水化为CsH 2后，AFt逐渐生成。凝胶状CS（A）H致密地包覆在CsH 2晶体上，抑制了CsH 2与水的连接。AFt晶体通过包覆在CsH 2晶体表面，将CsH 2晶体间的直接接触转变为间接接触的复合作用，防止了CsH 2晶体的水腐蚀。AFt的含量和形貌是提高PBG基砂浆抗水性能的关键因素。当SmPG：mGGBS：mCH= 240：160：15时，PBG基砂浆的饱和水强度和抗水系数分别达到20.8MPa和0.89，说明只要配合比合适，就可以成功制备出高抗水系数的PBG基砂浆。
This study aimed to manufacture phosphorus building gypsum (PBG)-based mortar with a high water resistance coefficient and to explore the anti-water mechanism of PBG-based mortar containing ground granulated blast furnace slag (GGBS) and calcium hydroxide (CH). The main hydration products of PBG-based mortar were CS(A)H and ettringite (AFt), along with CsH2; the chemical reaction 2A + 6CH + 6CsH0.5+ 55H → 2(C3A·3Cs·32H) occurred in PBG-based mortar; and AFt was produced gradually after the majority of the CsH0.5was hydrated into CsH2. Gelatinous CS(A)H densely coated the CsH2crystals to inhibit the connection between CsH2and water. AFt crystals prevented the CsH2crystals from water corrosion through the complex actions of the AFt crystals coating the surface of the CsH2crystals and transforming the direct contact among the CsH2crystals into the indirect contact among the CsH2crystals. The contents and morphologies of AFt were the key factors for increasing the water resistance coefficient of PBG-based mortar. AsmPG:mGGBS:mCH= 240:160:15, the water-saturated strength and water resistance coefficient of PBG-based mortar reached 20.8 MPa and 0.89, which meant that as long as the mix proportion was appropriate, PBG-based mortar with a high water resistance coefficient can be successfully produced.