基于电阻率法研究铝酸盐水泥的早期水化过程
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摘要
通过测定铝酸盐水泥在24 h内水化时的电阻率、浆体内部温度和水化产物的变化规律,研究铝酸盐水泥的早期水化过程。结果表明:根据电阻率变化规律可将铝酸盐水泥的水化过程分为4个阶段(溶解期、诱导期、晶相转变期和硬化期);溶解期的电阻率快速减小;诱导期的电阻率几乎保持不变;晶相转变期的电阻率急剧减小,水泥浆体温度升高,水化产物CAH_(10)发生转变,AH_3凝胶转变为AH_3晶体;硬化期的电阻率逐渐增大,水化产物增多,孔隙率减小;在相同龄期,高水灰比水泥浆体的电阻率比低水灰比水泥浆体的小。
The hydration process of calcium aluminate cement at early age was investigated via the measurements of the change of electrical resistivity, inner temperature, and hydration products of the cement pastes for less than 24 h. Based on the evolution of the electrical resistivity, the hydration process of calcium aluminate cement can be divided into four stages, i.e., the dissolution,induction, phase transformation, and hardening period, respectively. The electrical resistivity of cement pastes declines rapidly in the dissolution period and then keeps nearly constant in the induction period. During the phase transformation period, the inner temperature of the cement paste increases and results in the conversion of CAH_(10), as well as the conversion of AH_3 gel to gibbsite.The electrical resistivity declines sharply in this stage and then increases gradually in the coming hardening period. At the same age, the electrical resistivity of the cement pastes with a greater water-cement ratio is less than that of pastes with a lower water-cement ratio.
The hydration process of calcium aluminate cement at early age was investigated via the measurements of the change of electrical resistivity, inner temperature, and hydration products of the cement pastes for less than 24 h. Based on the evolution of the electrical resistivity, the hydration process of calcium aluminate cement can be divided into four stages, i.e., the dissolution,induction, phase transformation, and hardening period, respectively. The electrical resistivity of cement pastes declines rapidly in the dissolution period and then keeps nearly constant in the induction period. During the phase transformation period, the inner temperature of the cement paste increases and results in the conversion of CAH_(10), as well as the conversion of AH_3 gel to gibbsite.The electrical resistivity declines sharply in this stage and then increases gradually in the coming hardening period. At the same age, the electrical resistivity of the cement pastes with a greater water-cement ratio is less than that of pastes with a lower water-cement ratio.
引文
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[13]LIAO Y S,WEI X S,LI G W.Early hydration of calcium sulfoaluminate cement through electrical resistivity measurement and microstructure investigations[J].Constr Build Mater,2011,25(4):1572-1579.
[14]IVANOV R C,ANGULSKI DA LUZ C,ZOREL JR H E,et al.Behavior of calcium aluminate cement(CAC)in the presence of hexavalent chromium[J].Cem Concr Comp,2016,73:114-122.
[15]L'HOPITAL E,LOTHENBACH B,SCRIVENER K,et al.Alkali uptake in calcium alumina silicate hydrate(C-A-S-H)[J].Cem Concr Res,2016,85:122-136.
[2]TAYLOR H F W.Cement Chemistry[M].2nd Ed.London:Thomas Telford Publishing,1997.
[3]FALZONE G,BALONIS M,SANT G.X-AFm stabilization as a mechanism of bypassing conversion phenomena in calcium aluminate cements[J].Cem Concr Res,2015,72:54-68.
[4]ADAMS M P,IDEKER J H.Influence of aggregate type on conversion and strength in calcium aluminate cement concrete[J].Cem Concr Res,2017,100:284-296.
[5]SCRIVENER K L,CAPMAS A.Calcium aluminate cement//HEWLETT P C.Lea's chemistry of cement and concrete[M].4th Ed.Oxford:Butterworth-Heinemann,1998.
[6]王培铭,孙磊,徐玲琳,等.硅酸盐水泥与铝酸盐水泥混合体系的研究和应用[J].材料导报A.2013,27(1):139-143.WANG Peiming,SUN Lei,XU Linglin,et al.Mater Rev(in Chinese),2013,27(1):139-143.
[7]霍世金.硅酸盐水泥-铝酸盐水泥-石膏三元复合胶凝材料试验研究[D].西安:西安建筑科技大学,2007.HUO Shijin.Experimental study on the ternary composite cementing material of Portland cement-aluminate cement-gypsum[Dissertation].Xi'an:Xi'an University of Architecture and Technology,2007.
[8]魏小胜,肖莲珍,李宗津.采用电阻率法研究水泥水化过程[J].硅酸盐学报,2004,32(1):34-38.WEI Xiaosheng,XIAO Lianzhen,LI Zongjin.J Chin Ceram Soc,2004,32(1):34-38.
[9]HEIKAL M,MORSY M S,RADWAN M M.Electrical conductivity and phase composition of calcium aluminate cement containing air-cooled and water-cooled slag at 20,40 and 60℃[J].Cem Concr Res,2005,35:1438-1446.
[10]TANG S W,CAI X H,HE Z,et al.The review of early hydration of cement-based materials by electrical methods[J].Constr Build Mater,2017,146(15):15-29.
[11]LUZ A P,PANDOLFELLI V C.Halting the calcium aluminate cement hydration process[J].Ceram Int,2011,37(8):3789-3793.
[12]REIG L,SORIANO L,BORRACHERO M V,et al.Influence of calcium aluminate cement(CAC)on alkaline activation of red clay brick waste(RCBW)[J].Cem Concr Comp,2016,65:177-185.
[13]LIAO Y S,WEI X S,LI G W.Early hydration of calcium sulfoaluminate cement through electrical resistivity measurement and microstructure investigations[J].Constr Build Mater,2011,25(4):1572-1579.
[14]IVANOV R C,ANGULSKI DA LUZ C,ZOREL JR H E,et al.Behavior of calcium aluminate cement(CAC)in the presence of hexavalent chromium[J].Cem Concr Comp,2016,73:114-122.
[15]L'HOPITAL E,LOTHENBACH B,SCRIVENER K,et al.Alkali uptake in calcium alumina silicate hydrate(C-A-S-H)[J].Cem Concr Res,2016,85:122-136.
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