A kind of frost-resistant and wear-resistant cement concrete and its preparation method
A technology of cement concrete and hydrogel, which is applied in the field of frost-resistant and wear-resistant cement concrete and its preparation, which can solve the problems of poor freeze-thaw resistance and poor wear resistance of cement concrete, so as to improve the damage resistance and frost resistance. Resistance and wear resistance, and the effect of promoting the hydration process
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Embodiment 1
[0030] This embodiment provides a cement concrete, which is composed of the following raw materials in terms of mass percentage: 0.2% of cellulose ether, 1% of pH sensitive hydrogel, 17% of cement, 74% of aggregate, and 7.8% of water. %; of which fine aggregate is 25% and coarse aggregate is 49%.
[0031] Among them: the critical transition pH of the pH-sensitive hydrogel involved is 4 and 10, that is, when pH<4, the gel is in a shrinking state; when 4≤pH≤10, the gel is in a swelling state; The glue is in a contracted state.
[0032] The fineness modulus of the fine aggregate is 2.8, the mud content is 2.5%, and the apparent density is 2650kg / m 3 , bulk density is 1420kg / m 3 .
[0033] The particle size distribution of coarse aggregate is 10-31.5mm, the crushing index is 7.5%, and the apparent density is 2690kg / m 3 , the mud content is 0.5%. The total volume occupied by the aggregate in the concrete is very high. In most cases, it is difficult to reach the critical water ...
Embodiment 2
[0042] This embodiment provides a kind of frost-resistant and wear-resistant cement concrete, which is composed of the following raw materials in terms of mass percentage: 0.2% of cellulose ether, 1% of pH-sensitive hydrogel, 17% of cement, and 74% of aggregate , water is 7.8%.
[0043] In this example, the requirements for raw materials and the preparation method of antifreeze and wear-resistant cement concrete are the same as those in Example 1, except that the pH-sensitive hydrogel is prepared by dissolving 0.514g of CMC in 12.87g of deionized water, Then add 1.854g NaOH, 4.634g acrylic acid, 0.128g potassium persulfate (initiator), 0.74mL N,N'-methylenebisacrylamide solution with a mass concentration of 1g / L while stirring at 60°C (Cross-linking agent), cover the beaker with a film, and react for 1.5 hours to obtain a light red viscous liquid and obtain a pH-sensitive hydrogel.
[0044] The mass loss rate test method, relative dynamic elastic modulus test method, mechanic...
Embodiment 3
[0046] This embodiment provides a kind of freeze-thaw resistant cement concrete, which is composed of the following raw materials in terms of mass percentage: 0.3% of cellulose ether, 0.5% of pH sensitive hydrogel, 17.4% of cement, and 74% of aggregate, Water is 7.8%.
[0047] In this example, the requirements for raw materials and the preparation method of antifreeze and wear-resistant cement concrete are the same as those in Example 1. The difference is that during the preparation of the pH-sensitive hydrogel: 0.257g of CMC was dissolved in 6.435g of 0.929g NaOH, 2.319g acrylic acid, 0.06g potassium persulfate (initiator), 0.386mL N,N'-methylenebis Acrylamide solution (cross-linking agent) was covered with a beaker, and after 1.5 hours of reaction, a light red viscous liquid was obtained, and a pH-sensitive hydrogel was obtained.
[0048] The mass loss rate test method, relative dynamic elastic modulus test method, mechanical property test method, and wear resistance test m...
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Abstract
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