水电与新能源
水電與新能源
수전여신능원
HYDROPOWER AND NEW ENERGY
2015年
6期
13-16,33
,共5页
引气混凝土%矿物掺合料%抗冻性%气泡参数
引氣混凝土%礦物摻閤料%抗凍性%氣泡參數
인기혼응토%광물참합료%항동성%기포삼수
air-entraining concrete%mineral admixtures%freezing resistance%bubble parameters
对掺合料的引气混凝土性能进行了研究。结果表明：在水胶比相同的情况下，无论是掺粉煤灰还是矿渣粉，混凝土抗压强度都呈随着掺量的增加而降低的趋势。单掺粉煤灰或矿渣粉的混凝土相对动弹性模量随粉煤灰或矿渣粉掺量的增加呈降低的趋势，质量损失呈增大趋势。当粉煤灰和矿渣粉复掺，总掺量为40％且比例为1∶1时，试样300次冻融循环质量损失最小，但相对动弹性模量而言，与单掺矿渣粉的混凝土的质量损失接近。硬化混凝土试件的空气含量在7．78％～10．65％之间，气泡间距范围在0．202～0．382 mm之间，混凝土表现出了较好的抗冻性。
對摻閤料的引氣混凝土性能進行瞭研究。結果錶明：在水膠比相同的情況下，無論是摻粉煤灰還是礦渣粉，混凝土抗壓彊度都呈隨著摻量的增加而降低的趨勢。單摻粉煤灰或礦渣粉的混凝土相對動彈性模量隨粉煤灰或礦渣粉摻量的增加呈降低的趨勢，質量損失呈增大趨勢。噹粉煤灰和礦渣粉複摻，總摻量為40％且比例為1∶1時，試樣300次凍融循環質量損失最小，但相對動彈性模量而言，與單摻礦渣粉的混凝土的質量損失接近。硬化混凝土試件的空氣含量在7．78％～10．65％之間，氣泡間距範圍在0．202～0．382 mm之間，混凝土錶現齣瞭較好的抗凍性。
대참합료적인기혼응토성능진행료연구。결과표명：재수효비상동적정황하，무론시참분매회환시광사분，혼응토항압강도도정수착참량적증가이강저적추세。단참분매회혹광사분적혼응토상대동탄성모량수분매회혹광사분참량적증가정강저적추세，질량손실정증대추세。당분매회화광사분복참，총참량위40％차비례위1∶1시，시양300차동융순배질량손실최소，단상대동탄성모량이언，여단참광사분적혼응토적질량손실접근。경화혼응토시건적공기함량재7．78％～10．65％지간，기포간거범위재0．202～0．382 mm지간，혼응토표현출료교호적항동성。
Freezing resistance of the air-entraining concrete with admixtures is investigated.Results show that with the same water-cement ratio, compressive strength of the concrete reduces with the increase of mixing quantity of the fly ash or slag powder.If mixing with fly ash or slag power only, the relative dynamic elastic modulus of the concrete will de-crease with the increase of the mixing quantity of those admixtures, while the mass loss will increase.If mixing with fly ash and slag powder together, the mass loss of the concrete samples after 300 times of freezing-thawing cycles is of the minimum when the total content of those admixtures is 40% and the ratio of 1∶1.While the relative dynamic elastic modulus is close to the samples mixing with slag powder only.A relatively higher freezing resistance is obtained when the air content of the hardened concrete samples is between 7.78%~10.65%, and the range of bubble spacing is between 0.202~0.382 mm.
