CN113008732A - 一种测定浆体稳定度的试验方法 - Google Patents
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Abstract
本发明涉及浆体稳定度的测定方法,具体为一种测定浆体稳定度的试验方法。该方法将制备好的浆体倒入并注满竖直放置的盛样管中,放入水泥标准养护箱养护2‑3天,将硬化后浆体柱平均划分并加工成上、中、下三段试件,测量上、下两个试件的表观密度,通过表观密度的差异情况判断浆体稳定度的好坏。本发明提供了一种测定浆体稳定度的试验方法,采用本发明方法进行浆体稳定度得测定,填补了目前现行标准中对浆体匀质性能判别方法的缺失,为自密实混凝土配合比设计提供卡控指标依据。
Description
技术领域
本发明涉及浆体稳定度的测定方法,具体为一种测定浆体稳定度的试验方法。
背景技术
随着工程建设行业的高速发展,自密实混凝土应用范围越来越广泛,其胶凝材料体系组成也日益复杂。对于自密实混凝土一般由4至6种不同的胶凝材料组成。目前常用的胶凝材料主要包括水泥、矿渣粉、粉煤灰、硅灰、钢渣粉、石灰石粉、膨胀剂以及粘度改性材料等。由于各材料的化学组分以及物理性质均存在一定差异,例如各材料的表观密度、颗粒粒型、粒径大小都不尽相同,因此它们在浆体中,尤其是高流动性浆体中,难免会产生不均匀的沉降导致分层,造成浆体的匀质性差的现象。
然而目前国家及行业检测标准以及各类文献中,并未见到针对浆体匀质性的检测方法。并且浆体的匀质性并不能通过观察去直观的进行判断,因此发明了“浆体稳定度”的试验方法,通过测定浆体稳定度来判断浆体匀质性好坏。通过卡控浆体稳定度指标,从根本上杜绝混凝土的泌浆、离析现象。
发明内容
本发明的目的是测定浆体稳定度,通过卡控浆体稳定度指标,从根本上杜绝混凝土的泌浆、离析现象。
为实现上述目的,本发明采用的技术方案是:一种测定浆体稳定度的试验方法,包括以下步骤:将制备好的浆体倒入并注满竖直放置的盛样管中,放入水泥标准养护箱养护2-3天,将硬化后浆体柱平均划分并加工成上、中、下三段试件,测量上、下两个试件的表观密度,通过表观密度的差异情况判断浆体稳定度的好坏。本发明适用于测定浆体稳定度,对于多种胶凝材料组成的高流动性浆体,通过卡控浆体稳定度指标,可从根本上杜绝混凝土的泌浆、离析现象。
上述的一种测定浆体稳定度的试验方法,该方法具体包括以下步骤:
a、按混凝土配合比所用胶凝材料的组合比例称量胶凝材料,按照配合比水胶比及减水剂掺量,计算用水量及减水剂用量并称量;
b、将水和减水剂混合均匀加入搅拌锅、然后将胶凝材料加入;立即启动胶砂搅拌机进行搅拌;
c、将制备好的浆体缓慢均匀倒入、注满盛样管;
d、将盛样管竖直放置于固定支架上,移入水泥标准养护箱进行养护;
e、养护2-3天后,将盛样管取出,将盛样管剥除,得到圆柱型硬化浆体试件,标注清楚试件养护期间放置的方向;
f、将试件两端头部分切除舍弃,将剩余部分等分为3段,并标注清楚上、中、下;
g、使用静水天平称量上、下两个试件空气中质量m上、m下;
h、在静水天平下挂上网篮,浸入溢流水箱的水中,调节水位,将天平调平并复零,把上、下两个试件置于网篮中,待天平稳定后立即读数,称取水中质量mw上、mw下;
上述的一种测定浆体稳定度的试验方法,盛样管在注满前已涂抹脱模剂。
上述的一种测定浆体稳定度的试验方法,称取上下两个试件水中质量后并测量水温度,根据测量水温查表得到水密度。
采用本发明方法进行浆体稳定度得测定,填补了目前现行标准中对浆体匀质性能判别方法的缺失,为自密实混凝土配合比设计提供卡控指标依据。
具体实施方式
本发明所述的一种测定浆体稳定度的试验方法。
(1)检测环境要求:
温度20±2℃;相对湿度不小于50%。
(2)主要仪器设备:
水泥净浆搅拌机;
静水天平:量程5000g、精度0.1g;
天平:量程2000g、精度0.01g;
盛样管:铝管,直径约25mm,长约140mm,一端开口;
温度计;
锯石机;
水泥胶砂标准养护箱。
(3)试验步骤:
a、按混凝土配合比所用胶凝材料的组合比例称量胶凝材料300g,按照配合比水胶比及减水剂掺量,计算用水量及减水剂用量并称量,称量减水剂精确至0.01g,其余材料精确至0.1g;
b、将水和减水剂混合均匀加入搅拌锅、然后将胶凝材料加入;立即启动胶砂搅拌机进行搅拌(采用自动控制搅拌程序,慢速120s,停15s,快速120s);
c、将制备好的浆体缓慢均匀倒入、注满已涂抹脱模剂的盛样管;
d、将盛样管竖直放置于固定支架上,移入水泥标准养护箱进行养护。
e、养护3d后,将盛样管取出,将盛样管铝壳剥除,得到圆柱型硬化浆体试件,标注清楚试件养护期间放置的方向;
f、将试件两端头15mm部分切除舍弃,将剩余三部分等分为3段,并标注清楚上、中、下;
g、使用静水天平称量上、下两个试件空气中质量(m上、m下);
h、在静水天平下挂上网篮,浸入溢流水箱的水中,调节水位,将天平调平并复零,把试件置于网篮中(注意不要使水晃动),待天平稳定后立即读数,称取水中质量(mw上、mw下),并测量水温度。
(4)数据处理:
a、按照下式计算上、下两个试件表观密度:
式中ρw为水密度,应根据测量水温查表得到。
b、按照下式计算浆体的稳定度:
式中:WD—砂浆稳定度(%);
△ρ=ρ下-ρ上。
各密度计算精确至0.01g/cm3;稳定度计算精确至0.1%。
Claims (4)
1.一种测定浆体稳定度的试验方法,其特征在于:包括以下步骤:将制备好的浆体倒入并注满竖直放置的盛样管中,放入水泥标准养护箱养护2-3天,将硬化后浆体柱平均划分并加工成上、中、下三段试件,测量上、下两个试件的表观密度,通过表观密度的差异情况判断浆体稳定度的好坏。
2.根据权利要求1所述的一种测定浆体稳定度的试验方法,其特征在于:该方法具体包括以下步骤:
a、按混凝土配合比所用胶凝材料的组合比例称量胶凝材料,按照配合比水胶比及减水剂掺量,计算用水量及减水剂用量并称量;
b、将水和减水剂混合均匀加入搅拌锅、然后将胶凝材料加入;立即启动胶砂搅拌机进行搅拌;
c、将制备好的浆体缓慢均匀倒入、注满盛样管;
d、将盛样管竖直放置于固定支架上,移入水泥标准养护箱进行养护;
e、养护2-3天后,将盛样管取出,将盛样管剥除,得到圆柱型硬化浆体试件,标注清楚试件养护期间放置的方向;
f、将试件两端头部分切除舍弃,将剩余部分等分为3段,并标注清楚上、中、下;
g、使用静水天平称量上、下两个试件空气中质量m上、m下;
h、在静水天平下挂上网篮,浸入溢流水箱的水中,调节水位,将天平调平并复零,把上、下两个试件置于网篮中,待天平稳定后立即读数,称取水中质量mw上、mw下;
3.根据权利要求2所述的一种测定浆体稳定度的试验方法,其特征在于:盛样管在注满前已涂抹脱模剂。
4.根据权利要求2或3所述的一种测定浆体稳定度的试验方法,其特征在于:称取上下两个试件水中质量后并测量水温度,根据测量水温查表得到水密度。
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US20090090180A1 (en) * | 2007-10-08 | 2009-04-09 | Bryan Waugh | Method of Measuring a Set Cement Density and Settling Properties |
CN104237070A (zh) * | 2014-10-13 | 2014-12-24 | 中国石油集团渤海钻探工程有限公司 | 一种确定高密度水泥浆沉降稳定性指标的装置及方法 |
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US20090090180A1 (en) * | 2007-10-08 | 2009-04-09 | Bryan Waugh | Method of Measuring a Set Cement Density and Settling Properties |
CN104237070A (zh) * | 2014-10-13 | 2014-12-24 | 中国石油集团渤海钻探工程有限公司 | 一种确定高密度水泥浆沉降稳定性指标的装置及方法 |
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中华人民共和国国家质量监督检验检疫总局,中国国家标准化管理委员会: "《GB/T 19139-2012 油井水泥试验方法》", 31 December 2012 * |
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